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There are two primary ways to configure runtime behavior: CoreCLR hosts can pass in key-value string pairs during runtime initialization, or users can set special variables in the environment or registry. Today, the set of configuration options that can be set via the former method is relatively small, but moving forward, we expect to add more options there. Each set of options is described below.

Host Configuration Knobs

These can be passed in by a host during initialization. Note that the values are all passed in as strings, so if the type is boolean, the value would be the string "true" or "false", and if it's a numeric value, it would be in the form "123".

Name Description Type
System.GC.Concurrent Enable concurrent GC boolean
System.GC.Server Enable server GC boolean
System.GC.RetainVM Put segments that should be deleted on a standby list for future use instead of releasing them back to the OS boolean
System.Threading.ThreadPool.MinThreads Override MinThreads for the ThreadPool worker pool numeric
System.Threading.ThreadPool.MaxThreads Override MaxThreads for the ThreadPool worker pool numeric

Environment/Registry Configuration Knobs

This table is machine-generated from commit 82ed770 on 05/31/16. It might be out of date.

When using these configurations from environment variables, the variables need to have the COMPlus_ prefix in their names. e.g. To set DumpJittedMethods to 1, add the environment variable COMPlus_DumpJittedMethods=1.

See also Setting configuration variables for more information.

Name Description Type Class Default Value Flags
ADBreakOnCannotUnload Used to troubleshoot failures to unload appdomain (e.g. someone sitting in unmanged code). In some cases by the time we throw the appropriate exception the thread has moved from the offending call. This setting allows in an instrumented build to stop exactly at the right moment. DWORD INTERNAL 0
AddRejitNops Control for the profiler rejit feature infrastructure DWORD UNSUPPORTED
ADDumpSB Not used DWORD INTERNAL 0
ADForceSB Forces sync block creation for all objects DWORD INTERNAL 0
ADLogMemory Superseded by test hooks DWORD INTERNAL 0
ADTakeDHSnapShot Superseded by test hooks DWORD INTERNAL 0
ADTakeSnapShot Superseded by test hooks DWORD INTERNAL 0
EnableFullDebug Heavy-weight checking for AD boundary violations (AD leaks) DWORD INTERNAL
DisableMSIPeek Disable MSI check in Fusion DWORD INTERNAL 0
MsiPeekForbid Assert on MSI calls DWORD INTERNAL 0
ADULazyMemoryRelease On by default. Turned off in cases when people try to catch memory leaks, in which case AD unload should be immediately followed by GC) DWORD EXTERNAL 1
ADURetryCount Controls timeout of AD unload. Used for workarounds when machine is too slow, there are network issues etc. DWORD EXTERNAL
APPDOMAIN_MANAGER_ASM Legacy method to specify the assembly containing the AppDomainManager to use for the default domain STRING EXTERNAL DontPrependCOMPlus_ / IgnoreHKLM / IgnoreHKCU
APPDOMAIN_MANAGER_TYPE LegacyMethod to specify the type containing the AppDomainManager to use for the default domain STRING EXTERNAL DontPrependCOMPlus_ / IgnoreHKLM / IgnoreHKCU
appDomainManagerAssembly Config file switch to specify the assembly for the default AppDomainManager. STRING EXTERNAL IgnoreEnv / IgnoreHKLM / IgnoreHKCU
appDomainManagerType Config file switch to specify the type for the default AppDomainManager. STRING EXTERNAL IgnoreEnv / IgnoreHKLM / IgnoreHKCU
AppDomainAgilityChecked Used to detect AD boundary violations (AD leaks) DWORD INTERNAL
AppDomainNoUnload Not used DWORD INTERNAL 0
TargetFrameworkMoniker Allows the test team to specify what TargetFrameworkMoniker to use. STRING INTERNAL IgnoreHKLM / IgnoreHKCU / IgnoreConfigFiles / IgnoreWindowsQuirkDB
AppContextSwitchOverrides Allows default switch values defined in AppContext to be overwritten by values in the Config STRING INTERNAL IgnoreEnv / IgnoreHKLM / IgnoreHKCU / IgnoreWindowsQuirkDB / ConfigFile_ApplicationFirst
FinalizeOnShutdown When enabled, on shutdown, blocks all user threads and calls finalizers for all finalizable objects, including live objects DWORD EXTERNAL DEFAULT_FinalizeOnShutdown
ARMEnabled Set it to 1 to enable ARM DWORD UNSUPPORTED (DWORD)0
designerNamespaceResolution Set it to 1 to enable DesignerNamespaceResolve event for WinRT types DWORD EXTERNAL FALSE IgnoreEnv / IgnoreHKLM / IgnoreHKCU / FavorConfigFile
GetAssemblyIfLoadedIgnoreRidMap Used to force loader to ignore assemblies cached in the rid-map DWORD INTERNAL 0 REGUTIL_default
BCLCorrectnessWarnings Flag a few common correctness bugs in the library with additional runtime checks. DWORD INTERNAL
BCLPerfWarnings Flag some performance-related problems via asserts when people mis-use the library. DWORD INTERNAL
TimeSpan_LegacyFormatMode Flag to enable System.TimeSpan legacy (.NET Framework 3.5 and earlier) ToString behavior. DWORD EXTERNAL 0
CompatSortNLSVersion Determines the version of desired sorting behavior for AppCompat. DWORD EXTERNAL 0
NetFx45_CultureAwareComparerGetHashCode_LongStrings Opt in to use the new (as of v4.5) constant space hash algorithm for strings DWORD EXTERNAL 0
DisableUserPreferredFallback Resource lookups should be dependent only on the CurrentUICulture, not a user-defined list of preferred languages nor the OS preferred fallback language. Intended to avoid falling back to a right-to-left language, which is undisplayable in console apps. DWORD EXTERNAL 0
relativeBindForResources Enables probing for satellite assemblies only next to the parent assembly DWORD EXTERNAL 0
NetFx45_LegacyManagedDeflateStream Flag to enable legacy managed implementation of the deflater used by System.IO.Compression.DeflateStream. DWORD EXTERNAL 0
DateTime_NetFX35ParseMode Flag to enable the .NET 3.5 System.DateTime Token Replacement Policy DWORD EXTERNAL 0
ThrowUnobservedTaskExceptions Flag to propagate unobserved task exceptions on the finalizer thread. DWORD EXTERNAL 0
EnableAmPmParseAdjustment Flag to enable the .NET 4.0 DateTimeParse to correctly parse AM/PM cases DWORD EXTERNAL 0
UseRandomizedStringHashAlgorithm Flag to use a string hashing algorithm who's behavior differs between AppDomains DWORD EXTERNAL 0
Windows8ProfileAPICheckFlag Windows 8 Profile API check behavior (non-W8P framework APIs cannot be accessed through Reflection and RefEmit). 0: normal (only check in non-dev-mode APPX). 1: always check. 2: never check. DWORD INTERNAL 0
BreakOnBadExit DWORD UNSUPPORTED 0 REGUTIL_default
BreakOnClassBuild Very useful for debugging class layout code. STRING INTERNAL
BreakOnClassLoad Very useful for debugging class loading code. STRING INTERNAL
BreakOnComToClrNativeInfoInit Throws an assert when native information about a COM -> CLR call are about to be gathered. STRING INTERNAL
BreakOnDebugBreak allows an assert in debug builds when a user break is hit DWORD INTERNAL 0 REGUTIL_default
BreakOnDILoad allows an assert when the DI is loaded DWORD INTERNAL 0 REGUTIL_default
BreakOnDumpToken Breaks when using internal logging on a particular token value. DWORD INTERNAL 0xffffffff REGUTIL_default
BreakOnEELoad DWORD UNSUPPORTED 0 REGUTIL_default
BreakOnEEShutdown DWORD INTERNAL 0
BreakOnExceptionInGetThrowable DWORD INTERNAL 0 REGUTIL_default
BreakOnFinalizeTimeOut Triggers a debug break on the finalizer thread when it has exceeded the maximum wait time DWORD UNSUPPORTED 0
BreakOnFindMethod Breaks in findMethodInternal when it searches for the specified token. DWORD INTERNAL 0
BreakOnFirstPass DWORD INTERNAL 0 REGUTIL_default
BreakOnHR Debug.cpp, IfFailxxx use this macro to stop if hr matches DWORD INTERNAL 0 REGUTIL_default
BreakOnInstantiation Very useful for debugging generic class instantiation. STRING INTERNAL
BreakOnInteropStubSetup Throws an assert when marshaling stub for the given method is about to be built. STRING INTERNAL
BreakOnInteropVTableBuild Specifies a type name for which an assert should be thrown when building interop v-table. STRING INTERNAL REGUTIL_default
BreakOnMethodName Very useful for debugging method override placement code. STRING INTERNAL
BreakOnNGenRegistryAccessCount Breaks on the Nth' root store write DWORD UNSUPPORTED 0 REGUTIL_default
BreakOnNotify DWORD INTERNAL 0 REGUTIL_default
BreakOnRetailAssert Used for debugging 'retail' asserts (fatal errors) DWORD INTERNAL 0 REGUTIL_default
BreakOnSecondPass DWORD INTERNAL 0 REGUTIL_default
BreakOnSO DWORD UNSUPPORTED 0 REGUTIL_default
BreakOnStructMarshalSetup Throws an assert when field marshalers for the given type with layout are about to be created. STRING INTERNAL
BreakOnUEF DWORD INTERNAL 0 REGUTIL_default
BreakOnUncaughtException DWORD INTERNAL 0 REGUTIL_default
CseBinarySearch Sets internal jit constants for CSE STRING INTERNAL REGUTIL_default
CseMax Sets internal jit constants for CSE STRING INTERNAL REGUTIL_default
CseOn Internal Jit control of CSE STRING UNSUPPORTED REGUTIL_default
CseStats Collects CSE statistics STRING INTERNAL REGUTIL_default
D::FCE allows an assert when crawling the managed stack for an exception handler DWORD INTERNAL 0 REGUTIL_default
DbgBreakIfLocksUnavailable allows an assert when the debugger can't take a lock DWORD INTERNAL 0 REGUTIL_default
DbgBreakOnErr allows an assert when we get a failing hresult DWORD INTERNAL 0 REGUTIL_default
DbgBreakOnMapPatchToDJI allows an assert when mapping a patch to an address DWORD INTERNAL 0 REGUTIL_default
DbgBreakOnRawInt3 allows an assert for test coverage for debug break or other int3 breaks DWORD INTERNAL 0 REGUTIL_default
DbgBreakOnSendBreakpoint allows an assert when sending a breakpoint to the right side DWORD INTERNAL 0 REGUTIL_default
DbgBreakOnSetIP allows an assert when setting the IP DWORD INTERNAL 0 REGUTIL_default
DbgCheckInt3 asserts if the debugger explicitly writes int3 instead of calling SetUnmanagedBreakpoint DWORD INTERNAL 0 REGUTIL_default
DbgDACAssertOnMismatch allows an assert when the mscordacwks and mscorwks dll versions don't match DWORD INTERNAL
DbgDACEnableAssert Enables extra validity checking in DAC - assumes target isn't corrupt DWORD INTERNAL 0 REGUTIL_default
DbgDACSkipVerifyDlls allows disabling the check to ensure mscordacwks and mscorwks dll versions match DWORD INTERNAL 0 REGUTIL_default
DbgDelayHelper varies the wait in the helper thread startup for testing race between threads DWORD INTERNAL 0 REGUTIL_default
DbgDisableDynamicSymsCompat DWORD INTERNAL 0 REGUTIL_default
DbgDisableTargetConsistencyAsserts allows explicitly testing with corrupt targets DWORD INTERNAL 0 REGUTIL_default
DbgEnableMixedModeDebuggingInternalOnly DWORD INTERNAL 0 REGUTIL_default
DbgExtraThreads allows extra unmanaged threads to run and throw debug events for stress testing DWORD INTERNAL 0 REGUTIL_default
DbgExtraThreadsCantStop allows extra unmanaged threads in can't stop region to run and throw debug events for stress testing DWORD INTERNAL 0 REGUTIL_default
DbgExtraThreadsIB allows extra in-band unmanaged threads to run and throw debug events for stress testing DWORD INTERNAL 0 REGUTIL_default
DbgExtraThreadsOOB allows extra out of band unmanaged threads to run and throw debug events for stress testing DWORD INTERNAL 0 REGUTIL_default
DbgFaultInHandleIPCEvent allows testing the unhandled event filter DWORD INTERNAL 0 REGUTIL_default
DbgInjectFEE allows injecting a fatal execution error for testing Watson DWORD INTERNAL 0 REGUTIL_default
DbgLeakCheck allows checking for leaked Cordb objects DWORD INTERNAL 0 REGUTIL_default
DbgNo2ndChance allows breaking on (and catching bogus) 2nd chance exceptions DWORD INTERNAL 0 REGUTIL_default
DbgNoDebugger allows breaking if we don't want to lazily initialize the debugger DWORD INTERNAL 0 REGUTIL_default
DbgNoForceContinue used to force a continue on longhorn DWORD UNSUPPORTED 1 REGUTIL_default
DbgNoOpenMDByFile allows opening MD by memory for perf testing DWORD INTERNAL 0 REGUTIL_default
DbgOOBinFEEE allows forcing oob breakpoints when a fatal error occurs DWORD INTERNAL 0
DbgPackShimPath CoreCLR path to dbgshim.dll - we are trying to figure out if we can remove this STRING EXTERNAL
DbgPingInterop allows checking for deadlocks in interop debugging DWORD INTERNAL 0 REGUTIL_default
DbgRace allows pausing for native debug events to get hijicked DWORD INTERNAL 0 REGUTIL_default
DbgRedirect allows for redirecting the event pipeline DWORD UNSUPPORTED 0 REGUTIL_default
DbgRedirectApplication Specifies the auxillary debugger application to launch. STRING EXTERNAL
DbgRedirectAttachCmd Specifies command parameters for attaching the auxillary debugger. STRING EXTERNAL
DbgRedirectCommonCmd Specifies a command line format string for the auxillary debugger. STRING EXTERNAL
DbgRedirectCreateCmd Specifies command parameters when creating the auxillary debugger. STRING EXTERNAL
DbgShortcutCanary allows a way to force canary to fail to be able to test failure paths DWORD INTERNAL 0 REGUTIL_default
DbgSkipMEOnStep turns off MethodEnter checks DWORD INTERNAL 0 REGUTIL_default
DbgSkipVerCheck allows different RS and LS versions (for servicing work) DWORD INTERNAL 0 REGUTIL_default
DbgTC allows checking boundary compression for offset mappings DWORD INTERNAL 0 REGUTIL_default
DbgTransportFaultInject allows injecting a fault for testing the debug transport DWORD INTERNAL 0 REGUTIL_default
DbgTransportLog turns on logging for the debug transport DWORD INTERNAL
DbgTransportLogClass mask to control what is logged in DbgTransportLog DWORD INTERNAL
DbgTransportProxyAddress allows specifying the transport proxy address STRING UNSUPPORTED REGUTIL_default
DbgTrapOnSkip allows breaking when we skip a breakpoint DWORD INTERNAL 0 REGUTIL_default
DbgWaitTimeout specifies the timeout value for waits DWORD INTERNAL 1 REGUTIL_default
DbgWFDETimeout specifies the timeout value for wait when waiting for a debug event DWORD UNSUPPORTED 25 REGUTIL_default
RaiseExceptionOnAssert Raise a first chance (if set to 1) or second chance (if set to 2) exception on asserts. DWORD INTERNAL 0 REGUTIL_default
DebugBreakOnAssert If DACCESS_COMPILE is defined, break on asserts. DWORD INTERNAL 0 REGUTIL_default
DebugBreakOnVerificationFailure Halts the jit on verification failure DWORD INTERNAL 0 REGUTIL_default
DebuggerBreakPoint allows counting various debug events STRING INTERNAL REGUTIL_default
DebugVerify Control for tracing in peverify STRING INTERNAL REGUTIL_default
EncApplyChanges allows breaking when ApplyEditAndContinue is called DWORD INTERNAL 0
EnCBreakOnRemapComplete allows breaking after N RemapCompletes DWORD INTERNAL 0 REGUTIL_default
EnCBreakOnRemapOpportunity allows breaking after N RemapOpportunities DWORD INTERNAL 0 REGUTIL_default
EncDumpApplyChanges allows dumping edits in delta metadata and il files DWORD INTERNAL 0
EncFixupFieldBreak Unlikely that this is used anymore. DWORD INTERNAL 0
EncJitUpdatedFunction allows breaking when an updated function is jitted DWORD INTERNAL 0
EnCResolveField allows breaking when computing the address of an EnC-added field DWORD INTERNAL 0
EncResumeInUpdatedFunction allows breaking when execution resumes in a new EnC version of a function DWORD INTERNAL 0
DbgAssertOnDebuggeeDebugBreak If non-zero causes the managed-only debugger to assert on unhandled breakpoints in the debuggee DWORD INTERNAL 0 REGUTIL_default
UNSUPPORTED_DbgDontResumeThreadsOnUnhandledException If non-zero, then don't try to unsuspend threads after continuing a 2nd-chance native exception DWORD UNSUPPORTED 0
DbgSkipStackCheck Skip the stack pointer check during stackwalking DWORD UNSUPPORTED 0 REGUTIL_default
IntentionallyCorruptDataFromTarget Intentionally fakes bad data retrieved from target to try and break dump generation. DWORD INTERNAL 0
UNSUPPORTED_Debugging_RequiredVersion The lowest ICorDebug version we should attempt to emulate, or 0 for default policy. Use 2 for CLRv2, 4 for CLRv4, etc. DWORD UNSUPPORTED 0
MiniMdBufferCapacity The max size of the buffer to store mini metadata information for triage- and mini-dumps. DWORD INTERNAL 64 * 1024
ConditionalContracts ?If ENABLE_CONTRACTS_IMPL is defined, sets whether contracts are conditional. DWORD INTERNAL
ConsistencyCheck DWORD INTERNAL 0
ContinueOnAssert If set, doesn't break on asserts. DWORD INTERNAL 0 REGUTIL_default
disableStackOverflowProbing DWORD UNSUPPORTED 0 FavorConfigFile
EnforceEEThreadNotRequiredContracts Indicates whether to enforce EE_THREAD_NOT_REQUIRED contracts (not enforced by default for perf reasons). Only applicable in dbg/chk builds--EE_THREAD_NOT_REQUIRED contracts never enforced in ret builds. DWORD INTERNAL 0
InjectFatalError DWORD INTERNAL
InjectFault DWORD INTERNAL 0 REGUTIL_default
SuppressChecks DWORD INTERNAL
SuppressLockViolationsOnReentryFromOS 64 bit OOM tests re-enter the CLR via RtlVirtualUnwind. This indicates whether to suppress resulting locking violations. DWORD INTERNAL 0
TestHooks Used by tests to get test an insight on various CLR workings STRING INTERNAL
AssertOnFailFast DWORD INTERNAL
legacyCorruptedStateExceptionsPolicy Enabled Pre-V4 CSE behaviour DWORD UNSUPPORTED 0 FavorConfigFile
SuppressLostExceptionTypeAssert DWORD INTERNAL 0 REGUTIL_default
FailFastOnCorruptedStateException Failfast if a CSE is encountered DWORD UNSUPPORTED 0 FavorConfigFile
FastGCCheckStack DWORD INTERNAL 0
FastGCStress reduce the number of GCs done by enabling GCStress DWORD INTERNAL
GCBreakOnOOM Does a DebugBreak at the soonest time we detect an OOM DWORD UNSUPPORTED
gcConcurrent Enables/Disables concurrent GC DWORD UNSUPPORTED (DWORD)-1
gcConservative Enables/Disables conservative GC DWORD UNSUPPORTED 0
gcServer Enables server GC DWORD UNSUPPORTED 0
GcCoverage specify a method or regular expression of method names to run with GCStress STRING INTERNAL
SkipGcCoverage specify a list of assembly names to skip with GC Coverage STRING INTERNAL
gcForceCompact When set to true, always do compacting GC DWORD UNSUPPORTED
GCgen0size Specifies the smallest gen0 size DWORD UNSUPPORTED
GCStressMix Specifies whether the GC mix mode is enabled or not DWORD INTERNAL 0
GCStressStep Specifies how often StressHeap will actually do a GC in GCStressMix mode DWORD INTERNAL 1
GCStressMaxFGCsPerBGC Specifies how many FGCs will occur during one BGC in GCStressMix mode DWORD INTERNAL ~0U
StatsUpdatePeriod Specifies the interval, in seconds, at which to update the statistics DWORD UNSUPPORTED 60
SuspendTimeLog Specifies the name of the log file for suspension statistics STRING UNSUPPORTED
GCMixLog Specifies the name of the log file for GC mix statistics STRING UNSUPPORTED
GCLatencyMode Specifies the GC latency mode - batch, interactive or low latency (note that the same thing can be specified via API which is the supported way) DWORD INTERNAL
GCConfigLogEnabled Specifies if you want to turn on config logging in GC DWORD UNSUPPORTED 0
GCLogEnabled Specifies if you want to turn on logging in GC DWORD UNSUPPORTED 0
GCLogFile Specifies the name of the GC log file STRING UNSUPPORTED
GCConfigLogFile Specifies the name of the GC config log file STRING UNSUPPORTED
GCLogFileSize Specifies the GC log file size DWORD UNSUPPORTED 0
GCCompactRatio Specifies the ratio compacting GCs vs sweeping DWORD UNSUPPORTED 0
GCPollType DWORD EXTERNAL
NewGCCalc STRING EXTERNAL REGUTIL_default
GCprnLvl Specifies the maximum level of GC logging DWORD UNSUPPORTED
GCRetainVM When set we put the segments that should be deleted on a standby list (instead of releasing them back to the OS) which will be considered to satisfy new segment requests (note that the same thing can be specified via API which is the supported way) DWORD UNSUPPORTED 0
GCSegmentSize Specifies the managed heap segment size DWORD UNSUPPORTED
GCLOHCompact Specifies the LOH compaction mode DWORD UNSUPPORTED
gcAllowVeryLargeObjects allow allocation of 2GB+ objects on GC heap DWORD EXTERNAL 0
GCStress trigger GCs at regular intervals DWORD EXTERNAL 0 REGUTIL_default
GcStressOnDirectCalls whether to trigger a GC on direct calls DWORD INTERNAL 0 REGUTIL_default
GCStressStart start GCStress after N stress GCs have been attempted DWORD EXTERNAL 0
GCStressStartAtJit start GCStress after N items are jitted DWORD INTERNAL 0
GCtraceEnd Specifies the index of the GC when the logging should end DWORD UNSUPPORTED
GCtraceFacility Specifies where to log to (this allows you to log to console, the stress log or a normal CLR log (good when you need to correlate the GC activities with other CLR activities) DWORD INTERNAL
GCtraceStart Specifies the index of the GC when the logging should start DWORD UNSUPPORTED
gcTrimCommitOnLowMemory When set we trim the committed space more aggressively for the ephemeral seg. This is used for running many instances of server processes where they want to keep as little memory committed as possible DWORD EXTERNAL
BGCSpinCount Specifies the bgc spin count DWORD UNSUPPORTED 140
BGCSpin Specifies the bgc spin time DWORD UNSUPPORTED 2
HeapVerify When set verifies the integrity of the managed heap on entry and exit of each GC DWORD UNSUPPORTED
SetupGcCoverage This doesn't appear to be a config flag STRING EXTERNAL REGUTIL_default
GCNumaAware Specifies if to enable GC NUMA aware DWORD UNSUPPORTED 1
GCCpuGroup Specifies if to enable GC to support CPU groups DWORD EXTERNAL 0
IBCPrint STRING INTERNAL REGUTIL_default
IBCPrint3 STRING INTERNAL REGUTIL_default
ConvertIbcData Converts between v1 and v2 IBC data DWORD UNSUPPORTED 1 REGUTIL_default
DisableHotCold Master hot/cold splitting switch in Jit64 DWORD UNSUPPORTED
DisableIBC Disables the use of IBC data DWORD UNSUPPORTED 0 REGUTIL_default
UseIBCFile DWORD EXTERNAL 0 REGUTIL_default
DumpJittedMethods Prints all jitted methods to the console DWORD INTERNAL 0 REGUTIL_default
Jit64Range STRING INTERNAL REGUTIL_default
JitAlignLoops Aligns loop targets to 8 byte boundaries DWORD UNSUPPORTED
JitCloneLoops If 0, don't clone. Otherwise clone loops for optimizations. DWORD INTERNAL 1 REGUTIL_default
JitAssertOnMaxRAPasses DWORD INTERNAL 0 REGUTIL_default
JitBreak Stops in the importer when compiling a specified method STRING INTERNAL REGUTIL_default
JitBreakEmit DWORD INTERNAL (DWORD)-1 REGUTIL_default
JitBreakEmitOutputInstr DWORD INTERNAL (DWORD)-1 REGUTIL_default
JitBreakMorphTree DWORD INTERNAL 0xFFFFFFFF REGUTIL_default
JitBreakOnBadCode DWORD INTERNAL
JitBreakOnUnsafeCode DWORD INTERNAL 0 REGUTIL_default
JitCanUseSSE2 DWORD INTERNAL
JitDebugBreak STRING INTERNAL REGUTIL_default
JitDebuggable DWORD INTERNAL
JitDefaultFill In debug builds, initialize the memory allocated by the nra with this byte. DWORD INTERNAL 0xDD REGUTIL_default
JitDirectAlloc DWORD INTERNAL 0 REGUTIL_default
JitEnableNoWayAssert DWORD INTERNAL INTERNAL_JitEnableNoWayAssert_Default REGUTIL_default
JitDisasm Dumps disassembly for specified method STRING INTERNAL REGUTIL_default
JitDoubleAlign DWORD INTERNAL
JitDump Dumps trees for specified method STRING INTERNAL REGUTIL_default
JitDumpIR Dumps trees (in linear IR form) for specified method STRING INTERNAL REGUTIL_default
JitDumpIRFormat Comma separated format control for JitDumpIR, values = {types locals ssa valnums kinds
JitDumpIRPhase Phase control for JitDumpIR, values = {* phasename} STRING INTERNAL
JitDumpVerboseTrees Enable more verbose tree dumps DWORD INTERNAL 0 REGUTIL_default
JitDumpVerboseSsa Produce especially verbose dump output for SSA DWORD INTERNAL 0 REGUTIL_default
JitDumpBeforeAfterMorph If 1, display each tree before/after morphing DWORD INTERNAL 0 REGUTIL_default
JitDumpFg Dumps Xml/Dot Flowgraph for specified method STRING INTERNAL REGUTIL_default
JitDumpFgDir Directory for Xml/Dot flowgraph dump(s) STRING INTERNAL REGUTIL_default
JitDumpFgFile Filename for Xml/Dot flowgraph dump(s) STRING INTERNAL REGUTIL_default
JitDumpFgPhase Phase-based Xml/Dot flowgraph support. Set to the short name of a phase to see the flowgraph after that phase. Leave unset to dump after COLD-BLK (determine first cold block) or set to * for all phases STRING INTERNAL REGUTIL_default
JitDumpFgDot Set to non-zero to emit Dot instead of Xml Flowgraph dump DWORD INTERNAL 0 REGUTIL_default
JitDumpLevel DWORD INTERNAL 1 REGUTIL_default
JitDumpASCII Uses only ASCII characters in tree dumps DWORD INTERNAL 1 REGUTIL_default
JitDumpTerseLsra Produce terse dump output for LSRA DWORD INTERNAL 1 REGUTIL_default
JitDumpToDebugger Output JitDump output to the debugger DWORD INTERNAL 0 REGUTIL_default
JitEmitPrintRefRegs DWORD INTERNAL 0 REGUTIL_default
JitExclude STRING INTERNAL REGUTIL_default
JitForceFallback Set to non-zero to test NOWAY assert by forcing a retry DWORD INTERNAL 0 REGUTIL_default
JitNoForceFallback Set to non-zero to prevent NOWAY assert testing. Overrides COMPlus_JitForceFallback and JIT stress flags. DWORD INTERNAL 0 REGUTIL_default
JitExpensiveDebugCheckLevel Level indicates how much checking beyond the default to do in debug builds (currently 1-2) DWORD INTERNAL 0 REGUTIL_default
JitForceProcedureSplitting STRING INTERNAL REGUTIL_default
JitForceVer DWORD INTERNAL 0 REGUTIL_default
JitFramed Forces EBP frames DWORD UNSUPPORTED
JitFullyInt Forces Fully interruptable code DWORD INTERNAL 0 REGUTIL_default
JitGCChecks DWORD INTERNAL
JitGCDump STRING INTERNAL REGUTIL_default
JitGCInfoLogging If true, prints GCInfo-related output to standard output. DWORD INTERNAL 0
JitGCStress GC stress mode for jit DWORD INTERNAL 0 REGUTIL_default
JitHalt Emits break instruction into jitted code STRING INTERNAL REGUTIL_default
JitHashHalt Same as JitHalt, but for a method hash DWORD INTERNAL (DWORD)-1 REGUTIL_default
JitHashBreak Same as JitBreak, but for a method hash DWORD INTERNAL (DWORD)-1 REGUTIL_default
JitHashDump Same as JitDump, but for a method hash DWORD INTERNAL (DWORD)-1 REGUTIL_default
JitHashDumpIR Same as JitDumpIR, but for a method hash DWORD INTERNAL (DWORD)-1 REGUTIL_default
JitHeartbeat DWORD INTERNAL 0
JitHelperLogging DWORD INTERNAL 0
JitImportBreak STRING INTERNAL REGUTIL_default
JitInclude STRING INTERNAL REGUTIL_default
JitInlineAdditionalMultiplier DWORD EXTERNAL 0 REGUTIL_default
JitInlineSIMDMultiplier DWORD INTERNAL 3 REGUTIL_default
JitInlinePrintStats DWORD INTERNAL (DWORD)0 REGUTIL_default
JITInlineSize DWORD INTERNAL
JitLateDisasm STRING INTERNAL REGUTIL_default
JITLateDisasmTo STRING INTERNAL REGUTIL_default
JITMaxTempAssert DWORD INTERNAL 1 REGUTIL_default
JitMaxUncheckedOffset DWORD INTERNAL (DWORD)8 REGUTIL_default
JITMinOpts Forces MinOpts DWORD UNSUPPORTED
JITMinOptsBbCount Internal jit control of MinOpts DWORD INTERNAL
JITMinOptsCodeSize Internal jit control of MinOpts DWORD INTERNAL
JITMinOptsInstrCount Internal jit control of MinOpts DWORD INTERNAL
JITMinOptsLvNumcount Internal jit control of MinOpts DWORD INTERNAL
JITMinOptsLvRefcount Internal jit control of MinOpts DWORD INTERNAL
JITBreakOnMinOpts Halt if jit switches to MinOpts DWORD INTERNAL
JITMinOptsName Forces MinOpts for a named function STRING INTERNAL REGUTIL_default
JitName Primary Jit to use STRING EXTERNAL
AltJitName Alternative Jit to use, will fall back to primary jit. STRING EXTERNAL REGUTIL_default
AltJit Enables AltJit and selectively limits it to the specified methods. STRING EXTERNAL REGUTIL_default
AltJitExcludeAssemblies Do not use AltJit on this semicolon-delimited list of assemblies. STRING EXTERNAL REGUTIL_default
AltJitLimit Max number of functions to use altjit for (decimal) DWORD INTERNAL 0 REGUTIL_default
RunAltJitCode If non-zero, and the compilation succeeds for an AltJit, then use the code. If zero, then we always throw away the generated code and fall back to the default compiler. DWORD INTERNAL 1 REGUTIL_default
StackSamplingEnabled Is stack sampling based tracking of evolving hot methods enabled. DWORD UNSUPPORTED 0
StackSamplingAfter When to start sampling (for some sort of app steady state), i.e., initial delay for sampling start in milliseconds. DWORD UNSUPPORTED 0
StackSamplingEvery How frequent should thread stacks be sampled in milliseconds. DWORD UNSUPPORTED 100
StackSamplingNumMethods Number of evolving methods to track as hot and JIT them in the background at a given point of execution. DWORD UNSUPPORTED 32
AltJitNgen Enables AltJit for NGEN and selectively limits it to the specified methods. STRING INTERNAL REGUTIL_default
JitNoCMOV DWORD INTERNAL 0 REGUTIL_default
UseRyuJIT Set to 1 by .NET 4.6 installer to indicate RyuJIT should be used, not JIT64. DWORD INTERNAL 0 IgnoreEnv / IgnoreHKCU / IgnoreConfigFiles
useLegacyJit Set to 1 to do all JITing with compatjit.dll. Only applicable to x64. DWORD EXTERNAL 0
DisableNativeImageLoadList Refuse to load native images corresponding to one of the assemblies on this semicolon-delimited list of assembly names. STRING EXTERNAL REGUTIL_default
JitValNumCSE Enables ValNum CSE for the specified methods STRING INTERNAL REGUTIL_default
JitLexicalCSE Enables Lexical CSE for the specified methods STRING INTERNAL REGUTIL_default
JitNoCSE DWORD INTERNAL 0 REGUTIL_default
JitNoCSE2 DWORD INTERNAL 0 REGUTIL_default
JitNoHoist DWORD INTERNAL 0 REGUTIL_default
JitNoInline Disables inlining of all methods DWORD INTERNAL 0 REGUTIL_default
JitAggressiveInlining Aggressive inlining of all methods DWORD INTERNAL 0 REGUTIL_default
JitNoProcedureSplitting Disallow procedure splitting for specified methods STRING INTERNAL REGUTIL_default
JitNoProcedureSplittingEH Disallow procedure splitting for specified methods if they contain exception handling STRING INTERNAL REGUTIL_default
JitNoRegLoc DWORD INTERNAL 0 REGUTIL_default
JitNoStructPromotion Disables struct promotion in Jit32 DWORD INTERNAL 0 REGUTIL_default
JitNoUnroll DWORD INTERNAL 0 REGUTIL_default
JitNoMemoryBarriers If 1, don't generate memory barriers DWORD INTERNAL 0 REGUTIL_default
JitNoRngChks If 1, don't generate range checks DWORD PRIVATE 0
JitOptimizeType DWORD EXTERNAL
JitOrder DWORD INTERNAL 0 REGUTIL_default
JitDiffableDasm Make the disassembly diff-able DWORD INTERNAL 0 REGUTIL_default
JitSlowDebugChecksEnabled Turn on slow debug checks DWORD INTERNAL 1 REGUTIL_default
JITPInvokeCheckEnabled DWORD INTERNAL 0 REGUTIL_default
JITPInvokeEnabled DWORD INTERNAL 1
JitPrintInlinedMethods DWORD EXTERNAL 0 REGUTIL_default
JitTelemetry If non-zero, gather JIT telemetry data DWORD EXTERNAL 1
JitRange STRING INTERNAL REGUTIL_default
JITRequired DWORD INTERNAL (unsigned)-1 REGUTIL_default
JITRoundFloat DWORD INTERNAL
JitSkipArrayBoundCheck DWORD INTERNAL 0 REGUTIL_default
JitStackChecks DWORD INTERNAL
JitStackProbes DWORD INTERNAL
JitStress Internal Jit stress mode: 0 = no stress, 2 = all stress, other = vary stress based on a hash of the method and this value DWORD INTERNAL 0 REGUTIL_default
JitStressBBProf Internal Jit stress mode DWORD INTERNAL 0 REGUTIL_default
JitStressFP Internal Jit stress mode DWORD INTERNAL 0 REGUTIL_default
JitStressModeNames Internal Jit stress mode: stress using the given set of stress mode names, e.g. STRESS_REGS, STRESS_TAILCALL STRING INTERNAL REGUTIL_default
JitStressModeNamesNot Internal Jit stress mode: do NOT stress using the given set of stress mode names, e.g. STRESS_REGS, STRESS_TAILCALL STRING INTERNAL REGUTIL_default
JitStressOnly Internal Jit stress mode: stress only the specified method(s) STRING INTERNAL REGUTIL_default
JitStressRange Internal Jit stress mode STRING INTERNAL REGUTIL_default
JitStressRegs DWORD INTERNAL 0 REGUTIL_default
JitStressBiasedCSE Internal Jit stress mode: decimal bias value between (0,100) to perform CSE on a candidate. 100% = All CSEs. 0% = 0 CSE. (> 100) means no stress. DWORD INTERNAL 0x101 REGUTIL_default
JitStrictCheckForNonVirtualCallToVirtualMethod DWORD INTERNAL 1 REGUTIL_default
JitTimeLogFile If set, gather JIT throughput data and write to this file. STRING INTERNAL
JitTimeLogCsv If set, gather JIT throughput data and write to a CSV file. This mode must be used in internal retail builds. STRING INTERNAL
JitFuncInfoLogFile If set, gather JIT function info and write to this file. STRING INTERNAL
JitUnwindDump Dump the unwind codes for the method STRING INTERNAL
JitEHDump Dump the EH table for the method, as reported to the VM STRING INTERNAL
JitVerificationDisable DWORD INTERNAL
JitLockWrite Force all volatile writes to be 'locked' DWORD INTERNAL 0
TailCallMax STRING INTERNAL REGUTIL_default
TailCallOpt STRING EXTERNAL REGUTIL_default
TailcallStress DWORD INTERNAL 0 REGUTIL_default
TailCallLoopOpt Convert recursive tail calls to loops DWORD EXTERNAL 1
NetFx40_PInvokeStackResilience Makes P/Invoke resilient against mismatched signature and calling convention (significant perf penalty). DWORD EXTERNAL (DWORD)-1
JitDoSsa Perform Static Single Assignment (SSA) numbering on the variables DWORD INTERNAL 1 REGUTIL_default
JitDoEarlyProp Perform Early Value Propagataion DWORD INTERNAL 1 REGUTIL_default
JitDoValueNumber Perform value numbering on method expressions DWORD INTERNAL 1 REGUTIL_default
JitDoLoopHoisting Perform loop hoisting on loop invariant values DWORD INTERNAL 1 REGUTIL_default
JitDoCopyProp Perform copy propagation on variables that appear redundant DWORD INTERNAL 1 REGUTIL_default
JitDoAssertionProp Perform assertion propagation optimization DWORD INTERNAL 1 REGUTIL_default
JitDoRangeAnalysis Perform range check analysis DWORD INTERNAL 1 REGUTIL_default
JitSsaStress Perturb order of processing of blocks in SSA; 0 = no stress; 1 = use method hash; * = supplied value as random hash DWORD INTERNAL 0 REGUTIL_default
AltJitAssertOnNYI Controls the AltJit behavior of NYI stuff DWORD INTERNAL 0
AltJitAssertOnNYI Controls the AltJit behavior of NYI stuff DWORD INTERNAL 1
AltJitSkipOnAssert If AltJit hits an assert, fall back to the fallback JIT. Useful in conjunction with COMPlus_ContinueOnAssert=1 DWORD INTERNAL 0 REGUTIL_default
JitLargeBranches Force using the largest conditional branch format DWORD INTERNAL 0 REGUTIL_default
JitSplitFunctionSize On ARM, use this as the maximum function/funclet size for creating function fragments (and creating multiple RUNTIME_FUNCTION entries) DWORD INTERNAL 0 REGUTIL_default
JitRegisterFP Control FP enregistration DWORD EXTERNAL 3 REGUTIL_default
JitELTHookEnabled On ARM, setting this will emit Enter/Leave/TailCall callbacks DWORD INTERNAL 0
JitComponentUnitTests Run JIT component unit tests DWORD INTERNAL 0 REGUTIL_default
JitMemStats Display JIT memory usage statistics DWORD INTERNAL 0 REGUTIL_default
JitLoopHoistStats Display JIT loop hoisting statistics DWORD INTERNAL 0 REGUTIL_default
JitDebugLogLoopCloning In debug builds log places where loop cloning optimizations are performed on the fast path. DWORD INTERNAL 0 REGUTIL_default
JitVNMapSelLimit If non-zero, assert if # of VNF_MapSelect applications considered reaches this DWORD patsubst(INTERNAL_JitVNMapSelLimit, _.*, ) 0 patsubst(patsubst(CLRConfig::REGUTIL_default, CLRConfig::, ),
JitVNMapSelBudget Max # of MapSelect's considered for a particular top-level invocation. DWORD patsubst(INTERNAL_JitVNMapSelBudget, _.*, ) 100
FeatureSIMD Enable SIMD support with companion SIMDVector.dll DWORD EXTERNAL EXTERNAL_FeatureSIMD_Default REGUTIL_default
EnableAVX Enable AVX instruction set for wide operations as default DWORD EXTERNAL EXTERNAL_JitEnableAVX_Default REGUTIL_default
JitEnablePCRelAddr Whether absolute addr be encoded as PC-rel offset by RyuJIT where possible DWORD INTERNAL 1 REGUTIL_default
MultiCoreJitProfile If set, use the file to store/control multi-core JIT. STRING INTERNAL
MultiCoreJitProfileWriteDelay Set the delay after which the multi-core JIT profile will be written to disk. DWORD INTERNAL 12
JitFunctionTrace If non-zero, print JIT start/end logging DWORD INTERNAL 0
HashTableSize Size of Hashtable DWORD INTERNAL 500 REGUTIL_default
LargeSymCount Large Sym Count Size DWORD INTERNAL 100000 REGUTIL_default
Interpret Selectively uses the interpreter to execute the specified methods STRING INTERNAL REGUTIL_default
InterpretExclude Excludes the specified methods from the set selected by 'Interpret' STRING INTERNAL REGUTIL_default
InterpreterMethHashMin Only interpret methods selected by 'Interpret' whose hash is at least this value. or after nth DWORD INTERNAL 0
InterpreterMethHashMax If non-zero, only interpret methods selected by 'Interpret' whose hash is at most this value DWORD INTERNAL UINT32_MAX
InterpreterStubMin Only interpret methods selected by 'Interpret' whose stub num is at least this value. DWORD INTERNAL 0
InterpreterStubMax If non-zero, only interpret methods selected by 'Interpret' whose stub number is at most this value. DWORD INTERNAL UINT32_MAX
InterpreterJITThreshold The number of times a method should be interpreted before being JITted DWORD INTERNAL 10
InterpreterDoLoopMethods If set, don't check for loops, start by interpreting all methods DWORD INTERNAL 0
InterpreterUseCaching If non-zero, use the caching mechanism. DWORD INTERNAL 1 REGUTIL_default
InterpreterLooseRules If non-zero, allow ECMA spec violations required by managed C++. DWORD INTERNAL 1 REGUTIL_default
InterpreterPrintPostMortem Prints summary information about the execution to the console DWORD INTERNAL 0
InterpreterLogFile If non-null, append interpreter logging to this file, else use stdout STRING INTERNAL REGUTIL_default
DumpInterpreterStubs Prints all interpreter stubs that are created to the console DWORD INTERNAL 0
TraceInterpreterEntries Logs entries to interpreted methods to the console DWORD INTERNAL 0
TraceInterpreterIL Logs individual instructions of interpreted methods to the console DWORD INTERNAL 0
TraceInterpreterOstack Logs operand stack after each IL instruction of interpreted methods to the console DWORD INTERNAL 0
TraceInterpreterVerbose Logs interpreter progress with detailed messages to the console DWORD INTERNAL 0
TraceInterpreterJITTransition Logs when the interpreter determines a method should be JITted DWORD INTERNAL 0
InterpreterFallback Fallback to the interpreter when the JIT compiler fails DWORD INTERNAL 0
APIThreadStress Used to test Loader for race conditions DWORD INTERNAL
ForceLog Fusion flag to enforce assembly binding log. Heavily used and documented in MSDN and BLOGS. DWORD EXTERNAL
LoaderOptimization Controls code sharing behavior DWORD EXTERNAL
CoreClrBinderLog Debug flag that enabled detailed log for new binder (similar to stress logging). STRING INTERNAL
DisableIJWVersionCheck Don't perform the new version check that prevents unsupported IJW in-proc SxS. DWORD EXTERNAL 0
EnableFastBindClosure If set to >0 the binder uses CFastAssemblyBindingClosure instances DWORD UNSUPPORTED 0
DisableFXClosureWalk Disable full closure walks even in the presence of FX binding redirects DWORD INTERNAL 0
TagAssemblyNames Enable CAssemblyName::_tag field for more convenient debugging. DWORD INTERNAL 0
WinMDPath Path for Windows WinMD files STRING INTERNAL
LoaderHeapCallTracing Loader heap troubleshooting DWORD INTERNAL 0 REGUTIL_default
CodeHeapReserveForJumpStubs Percentage of code heap to reserve for jump stubs DWORD INTERNAL 2
NGenReserveForJumpStubs Percentage of ngen image size to reserve for jump stubs DWORD INTERNAL 0
BreakOnOutOfMemoryWithinRange Break before out of memory within range exception is thrown DWORD INTERNAL 0
LogEnable Turns on the traditional CLR log. DWORD INTERNAL
LogFacility Specifies a facility mask for CLR log. (See 'loglf.h'; VM interprets string value as hex number.) Also used by stresslog. DWORD INTERNAL
LogFacility2 Specifies a facility mask for CLR log. (See 'loglf.h'; VM interprets string value as hex number.) Also used by stresslog. DWORD INTERNAL
logFatalError Specifies whether EventReporter logs fatal errors in the Windows event log. DWORD EXTERNAL 1
LogFile Specifies a file name for the CLR log. STRING INTERNAL REGUTIL_default
LogFileAppend Specifies whether to append to or replace the CLR log file. DWORD INTERNAL
LogFlushFile Specifies whether to flush the CLR log file file on each write. DWORD INTERNAL
LogLevel 4=10 msgs, 9=1000000, 10=everything DWORD EXTERNAL
LogPath ?Fusion debug log path. STRING INTERNAL
LogToConsole Writes the CLR log to console. DWORD INTERNAL
LogToDebugger Writes the CLR log to debugger (OutputDebugStringA). DWORD INTERNAL
LogToFile Writes the CLR log to a file. DWORD INTERNAL
LogWithPid Appends pid to filename for the CLR log. DWORD INTERNAL
FusionLogFileNamesIncludePid Fusion logging will append process id to log filenames. DWORD EXTERNAL 0 REGUTIL_default
MD_ApplyDeltaBreak ASSERT when appplying EnC DWORD INTERNAL 0 REGUTIL_default
AssertOnBadImageFormat ASSERT when invalid MD read DWORD INTERNAL
MD_DeltaCheck ? Some checks of GUID when applying EnC? DWORD INTERNAL 1 REGUTIL_default
MD_EncDelta ? Forces EnC Delta format in MD DWORD INTERNAL 0 REGUTIL_default
MD_ForceNoColDesSharing ? ? Don't know - the only usage I could find is #if 0 DWORD patsubst(INTERNAL_MD_ForceNoColDesSharing, _.*, ) 0 patsubst(patsubst(CLRConfig::REGUTIL_default, CLRConfig::, ),
MD_KeepKnownCA ? Something with known CAs? DWORD INTERNAL 0 REGUTIL_default
MD_MiniMDBreak ASSERT when creating CMiniMdRw class DWORD INTERNAL 0 REGUTIL_default
MD_PreSaveBreak ASSERT when calling CMiniMdRw::PreSave DWORD INTERNAL 0 REGUTIL_default
MD_RegMetaBreak ASSERT when creating RegMeta class DWORD INTERNAL 0 REGUTIL_default
MD_RegMetaDump ? Dump MD in 4 functions? DWORD INTERNAL 0 REGUTIL_default
MD_TlbImp_BreakOnErr ASSERT when importing TLB into MD DWORD INTERNAL 0 REGUTIL_default
MD_TlbImp_BreakOnTypeImport ASSERT when importing a type from TLB STRING INTERNAL (LookupOptions) (REGUTIL_default / DontPrependCOMPlus_)
MD_UseMinimalDeltas ? Some MD modifications when applying EnC? DWORD INTERNAL 1 REGUTIL_default
MD_WinMD_Disable Never activate the WinMD import adapter DWORD INTERNAL 0 REGUTIL_default
MD_WinMD_AssertOnIllegalUsage ASSERT if a WinMD import adapter detects a tool incompatibility DWORD INTERNAL 0 REGUTIL_default
MD_PreserveDebuggerMetadataMemory Save all versions of metadata memory in the debugger when debuggee metadata is updated DWORD EXTERNAL 0 REGUTIL_default
MDA Config string to determine which MDAs to enable STRING EXTERNAL REGUTIL_default
MDAValidateFramework If set, validate the XML schema for MDA STRING INTERNAL REGUTIL_default
SpinInitialDuration Hex value specifying the first spin duration DWORD EXTERNAL 0x32 EEConfig_default
SpinBackoffFactor Hex value specifying the growth of each successive spin duration DWORD EXTERNAL 0x3 EEConfig_default
SpinLimitProcCap Hex value specifying the largest value of NumProcs to use when calculating the maximum spin duration DWORD EXTERNAL 0xFFFFFFFF EEConfig_default
SpinLimitProcFactor Hex value specifying the multiplier on NumProcs to use when calculating the maximum spin duration DWORD EXTERNAL 0x4E20 EEConfig_default
SpinLimitConstant Hex value specifying the constant to add when calculating the maximum spin duration DWORD EXTERNAL 0x0 EEConfig_default
SpinRetryCount Hex value specifying the number of times the entire spin process is repeated (when applicable) DWORD EXTERNAL 0xA EEConfig_default
NgenBind_UseTimestamp Use timestamp to validate a native image DWORD INTERNAL 0
NgenBind_UseTimestampList STRING INTERNAL
NgenBind_UseTimestampExcludeList STRING INTERNAL
NgenBind_ZapForbid Assert if an assembly succeeds in binding to a native image DWORD INTERNAL 0
NgenBind_ZapForbidExcludeList STRING INTERNAL
NgenBind_ZapForbidList STRING INTERNAL
NgenBind_OptimizeNonGac Skip loading IL image outside of GAC when NI can be loaded DWORD EXTERNAL 0
SymDiffDump Used to create the map file while binding the assembly. Used by SemanticDiffer DWORD INTERNAL 0 REGUTIL_default
NGen_JitName STRING EXTERNAL REGUTIL_default
NGEN_USE_PRIVATE_STORE DWORD EXTERNAL -1 REGUTIL_default
NGENBreakOnInjectPerAssemblyFailure DWORD INTERNAL 0 REGUTIL_default
NGENBreakOnInjectTransientFailure DWORD INTERNAL 0 REGUTIL_default
NGENBreakOnWorker DWORD EXTERNAL 0 REGUTIL_default
NGenClean DWORD EXTERNAL 0 REGUTIL_default
NGenCompileWorkerHang If set to 1, NGen compile worker process hangs forever DWORD UNSUPPORTED 0 REGUTIL_default
NGenDeferAllCompiles DWORD EXTERNAL 0 REGUTIL_default
NGenDependencyWorkerHang If set to 1, NGen dependency walk worker process hangs forever DWORD UNSUPPORTED 0 REGUTIL_default
NgenDisasm Same as JitDisasm, but for ngen STRING INTERNAL REGUTIL_default
NgenDump Same as JitDump, but for ngen STRING INTERNAL REGUTIL_default
NgenDumpIR Same as JitDumpIR, but for ngen STRING INTERNAL REGUTIL_default
NgenDumpIRFormat Same as JitDumpIRFormat, but for ngen STRING INTERNAL REGUTIL_default
NgenDumpIRPhase Same as JitDumpIRPhase, but for ngen STRING INTERNAL REGUTIL_default
NgenDumpFg Ngen Xml Flowgraph support STRING INTERNAL REGUTIL_default
NgenDumpFgDir Ngen Xml Flowgraph support STRING INTERNAL REGUTIL_default
NgenDumpFgFile Ngen Xml Flowgraph support STRING INTERNAL REGUTIL_default
NGenFramed same as JitFramed, but for ngen DWORD UNSUPPORTED -1 REGUTIL_default
NgenGCDump STRING INTERNAL REGUTIL_default
NgenHashDump same as JitHashDump, but for ngen DWORD INTERNAL (DWORD)-1 REGUTIL_default
NgenHashDumpIR same as JitHashDumpIR, but for ngen DWORD INTERNAL (DWORD)-1 REGUTIL_default
NGENInjectFailuresServiceOnly DWORD INTERNAL 1 REGUTIL_default
NGENInjectPerAssemblyFailure DWORD INTERNAL 0 REGUTIL_default
NGENInjectTransientFailure DWORD INTERNAL 0 REGUTIL_default
NGenLocalWorker DWORD EXTERNAL 0 REGUTIL_default
NGenMaxLogSize The maximum size ngen.log and ngen_service.log files can grow to. DWORD UNSUPPORTED 0 REGUTIL_default
NGenLogVerbosity Default ngen log verbosity level DWORD EXTERNAL 2 REGUTIL_default
NGenOnlyOneMethod DWORD INTERNAL 0 REGUTIL_default
NgenOrder DWORD INTERNAL 0 REGUTIL_default
CheckNGenImageTimeStamp Used to skip ngen timestamp check when switching compilers around. DWORD EXTERNAL 1 REGUTIL_default
NGenRegistryAccessCount DWORD EXTERNAL -1 REGUTIL_default
NGenStressDelete DWORD EXTERNAL 0 REGUTIL_default
NGenUninstallKeep Semicolon-delimited list of assemblies to keep during 'ngen uninstall *' STRING INTERNAL
NgenUnwindDump Dump the unwind codes for the method STRING INTERNAL
NgenEHDump Dump the EH table for the method, as reported to the VM STRING INTERNAL
NGENUseService DWORD EXTERNAL 1 REGUTIL_default
NGenWorkerCount DWORD EXTERNAL 0 REGUTIL_default
partialNGenStress DWORD INTERNAL 0 REGUTIL_default
ZapDoNothing DWORD INTERNAL 0 REGUTIL_default
HardPrejitEnabled DWORD EXTERNAL
EnableHardbinding Enables the use of hardbinding DWORD INTERNAL 0 REGUTIL_default
WorkerRetryNgenFailures If set to 1, The Ngen worker will retry once when ngen fails DWORD INTERNAL 0 REGUTIL_default
NgenForceFailureMask Bitmask used to control which locations will check and raise the failure (defaults to bits: -1) DWORD INTERNAL -1 REGUTIL_default
NgenForceFailureCount If set to >0 and we have IBC data we will force a failure after we reference an IBC data item times DWORD INTERNAL 0 REGUTIL_default
NgenForceFailureKind If set to 1, We will throw a TypeLoad exception; If set to 2, We will cause an A/V DWORD INTERNAL 1 REGUTIL_default
NGenEnableCreatePdb If set to >0 ngen.exe displays help on, recognizes createpdb in the command line DWORD UNSUPPORTED 0
NGenSimulateDiskFull If set to 1, ngen will throw a Disk full exception in ZapWriter.cpp:Save() DWORD INTERNAL 0
NGenAssemblyUsageLog Directory to store ngen usage logs in. STRING INTERNAL
NGenAssemblyUsageLogRefreshInterval Interval to update usage log timestamp (seconds) DWORD INTERNAL 24 * 60 * 60
AppLocalAutongenNGenDisabled Autongen disable flag. DWORD INTERNAL 0
PartialNGen Generate partial NGen images DWORD INTERNAL -1
NgenAllowMscorlibSoftbind Disable forced hard-binding to mscorlib DWORD INTERNAL 0
RegistryRoot Redirects all registry access under HKLM\Software to a specified alternative STRING UNSUPPORTED REGUTIL_default
AssemblyPath Redirects v2 GAC access to a specified alternative path STRING UNSUPPORTED REGUTIL_default
AssemblyPath2 Redirects v4 GAC access to a specified alternative path STRING UNSUPPORTED REGUTIL_default
NicPath Redirects NIC access to a specified alternative STRING UNSUPPORTED REGUTIL_default
NGenTaskDelayStart Use NGen Task delay start trigger, instead of critical idle task DWORD INTERNAL 0
Ningen Enable no-impact ngen DWORD INTERNAL 1
Ningen Enable no-impact ngen DWORD INTERNAL 0
NoASLRForNgen Turn off IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE bit in generated ngen images. Makes nidump output repeatable from run to run. DWORD INTERNAL 0
NgenAllowOutput If set to 1, the NGEN worker will bind to the parent console, thus allowing stdout output to work DWORD EXTERNAL 0 REGUTIL_default
CrossGenAssumeInputSigned CrossGen should assume that its input assemblies will be signed before deployment DWORD INTERNAL 1
NGENServiceAbortIdleWorkUnderDebugger Determines whether the Ngen service will abort idle-time tasks while under a debugger. Off by default. Allows for single-machine debugging of the idle-time logic. DWORD INTERNAL 1 REGUTIL_default
NGENServiceAggressiveHardDiskIdleTimeout This flag was intended as a backstop for HDD idle time detection (i.e. even if the hard disk is not idle, proceed with the compilation of the high-priority assemblies after the specified timeout). The current implementation compiles high-priority assemblies regardless of the state of the machine. DWORD EXTERNAL 16060*1000 REGUTIL_default
NGENServiceAggressiveWorkWaitTimeout This flag was intended as a backstop for machine idle time detection (i.e. even if the machine is not idle, proceed with the compilation of the high-priority assemblies after the specified timeout). The current implementation compiles high-priority assemblies regardless of the state of the machine. DWORD EXTERNAL 0 REGUTIL_default
NGENServiceBreakOnStart Determines whether the Ngen service will call DebugBreak in its start routing. Off by default. Marginally useful for debugging service startup (there are other techniques as well). DWORD UNSUPPORTED 0 REGUTIL_default
NGENServiceConservative Determines whether the Ngen service will avoid compiling low-priority assemblies if multiple sessions exist on the machine and it can't determine their state. Off by default. DWORD UNSUPPORTED 0 REGUTIL_default
NGenServiceDebugLog Configures the level of debug logging. DWORD UNSUPPORTED 0 REGUTIL_default
NGENServiceIdleBatteryThreshold When a battery-powered system is below the threshold, Ngen will not process low-priority assemblies. DWORD UNSUPPORTED 50 REGUTIL_default
NGENServiceIdleDebugInfo Determines whether the Ngen service will print the idle-time detection criteria to the debug log. Off by default. Ignored if NGenServiceDebugLog is 0. DWORD UNSUPPORTED 0 REGUTIL_default
NGENServiceIdleDiskLogic Determines if the Ngen service will use hard disk idle time for its machine idle time heuristics. DWORD UNSUPPORTED 1 REGUTIL_default
NGENServiceIdleDiskThreshold The amount of time after which a disk is declared idle. DWORD UNSUPPORTED 80 REGUTIL_default
NGENServiceIdleNoInputPeriod The amount of time after which the machine is declared idle if no input was received. DWORD UNSUPPORTED 5601000 REGUTIL_default
NGENServicePassiveExceptInputTimeout The amount of time after which only input state is considered for idle time detection (input backstop mode, which ignores everything except input). DWORD UNSUPPORTED 156060*1000 REGUTIL_default
NGENServicePassiveHardDiskIdleTimeout The amount of time after which the state of the hard disk is ignored for idle time detection. DWORD UNSUPPORTED 366060*1000 REGUTIL_default
NGENServicePassiveWorkWaitTimeout The amount of time after which the machine is declared idle and low priority assemblies are compiled no matter what the actual state is (absolute backstop mode: declaring the machine as idle disregarding the actual state). DWORD UNSUPPORTED 0 REGUTIL_default
NGENServicePolicy The policy that will be used for the machine (client or server). By default, it's determined from the OS SKU. DWORD UNSUPPORTED
NGENServiceRestrictWorkersPrivileges Determines if worker processes are launched with restricted tokens. DWORD UNSUPPORTED 1
NGENServiceSynchronization Determines if multiple services coordinate themselves so that only one service is working at a time. DWORD UNSUPPORTED 1 REGUTIL_default
NGENServiceTestHookDll The name of a module used for testing in-process STRING UNSUPPORTED
NGENServiceWaitAggressiveWork Specifies how often the service will check the machine state when trying to do high-priority work. STRING UNSUPPORTED
NGENServiceWaitPassiveWork Specifies how often the service will check the machine state when trying to do low-priority work. DWORD UNSUPPORTED 1601000 REGUTIL_default
NGENServiceWaitWorking While working, the Ngen service polls the state of the machine for changes (another service trying to do higher priority work, the Ngen command line tool trying to do work, machine coming out of idle state). This variable controls the frequency of the polling. DWORD UNSUPPORTED 1000 REGUTIL_default
NGENServiceWorkerPriority The process priority class for workers. DWORD UNSUPPORTED
EnableMultiproc Turns on multiproc ngen DWORD EXTERNAL 1 REGUTIL_default
SvcRetryNgenFailures If set to 1, The Ngen service will retry once when ngen fails DWORD EXTERNAL 1 REGUTIL_default
NGenTaskDelayStartAmount Number of seconds to delay for ngen update /queue /delay DWORD INTERNAL 5 * 60 REGUTIL_default
NGenProtectedProcess_FeatureEnabled Run ngen as PPL (protected process) if needed. Set to 0 to disable the feature for compat with older Win8 builds. DWORD INTERNAL -1 IgnoreConfigFiles
NGenProtectedProcess_RequiredList Semicolon-separated list of assembly names that are required to be ngen'd in PPL process. Each name in the list is matched as prefix or suffix of assembly name/assembly file name. STRING INTERNAL IgnoreConfigFiles
NGenProtectedProcess_ForbiddenList Semicolon-separated list of assembly names that are forbidden to be ngen'd in PPL process. Each name in the list is matched as prefix or suffix of assembly name/assembly file name. STRING INTERNAL IgnoreConfigFiles
NGenCopyFromRepository_SetCachedSigningLevel Support for test tree ngen.exe flag /CopyFromRepository to also vouch for the output NIs. DWORD INTERNAL 0 IgnoreConfigFiles
performanceScenario Activates a set of workload-specific default values for performance settings STRING EXTERNAL
ProcessNameFormat Used by corperfmonext.dll to determine whether to decorate an instance name with the corresponding PID and runtime ID DWORD EXTERNAL (DWORD)-1 IgnoreHKLM / IgnoreHKCU / IgnoreConfigFiles
COR_ENABLE_PROFILING Flag to indicate whether profiling should be enabled for the currently running process. DWORD EXTERNAL 0 DontPrependCOMPlus_ / IgnoreConfigFiles
COR_PROFILER Specifies GUID of profiler to load into currently running process STRING EXTERNAL DontPrependCOMPlus_
COR_PROFILER_PATH Specifies the path to the DLL of profiler to load into currently running process STRING EXTERNAL DontPrependCOMPlus_
COR_PROFILER_PATH_32 Specifies the path to the DLL of profiler to load into currently running 32 bits process STRING EXTERNAL DontPrependCOMPlus_
COR_PROFILER_PATH_64 Specifies the path to the DLL of profiler to load into currently running 64 bits process STRING EXTERNAL DontPrependCOMPlus_
CORECLR_ENABLE_PROFILING CoreCLR only: Flag to indicate whether profiling should be enabled for the currently running process. DWORD EXTERNAL 0 DontPrependCOMPlus_ / IgnoreConfigFiles
CORECLR_PROFILER CoreCLR only: Specifies GUID of profiler to load into currently running process STRING EXTERNAL DontPrependCOMPlus_
CORECLR_PROFILER_PATH CoreCLR only: Specifies the path to the DLL of profiler to load into currently running process STRING EXTERNAL DontPrependCOMPlus_
CORECLR_PROFILER_PATH_32 CoreCLR only: Specifies the path to the DLL of profiler to load into currently running 32 process STRING EXTERNAL DontPrependCOMPlus_
CORECLR_PROFILER_PATH_64 CoreCLR only: Specifies the path to the DLL of profiler to load into currently running 64 process STRING EXTERNAL DontPrependCOMPlus_
ProfAPI_ProfilerCompatibilitySetting Specifies the profiler loading policy (the default is not to load a V2 profiler in V4) STRING EXTERNAL REGUTIL_default / TrimWhiteSpaceFromStringValue
AttachThreadAlwaysOn Forces profapi attach thread to be created on startup, instead of on-demand. DWORD EXTERNAL
MsBetweenAttachCheck DWORD EXTERNAL 500
ProfAPIMaxWaitForTriggerMs Timeout in ms for profilee to wait for each blocking operation performed by trigger app. DWORD EXTERNAL 5601000
ProfAPI_DetachMinSleepMs The minimum time, in millseconds, the CLR will wait before checking whether a profiler that is in the process of detaching is ready to be unloaded. DWORD EXTERNAL 0
ProfAPI_DetachMaxSleepMs The maximum time, in millseconds, the CLR will wait before checking whether a profiler that is in the process of detaching is ready to be unloaded. DWORD EXTERNAL 0
ProfAPI_EnableRejitDiagnostics Enable extra dumping to stdout of rejit structures DWORD INTERNAL 0
ProfAPI_AttachProfilerMinTimeoutInMs Timeout in ms for the minimum time out value of AttachProfiler DWORD EXTERNAL 10*1000
ProfAPIFault Test-only bitmask to inject various types of faults in the profapi code DWORD INTERNAL 0
TestOnlyAllowedEventMask Test-only bitmask to allow profiler tests to override CLR enforcement of COR_PRF_ALLOWABLE_AFTER_ATTACH and COR_PRF_MONITOR_IMMUTABLE DWORD INTERNAL 0
ProfAPI_TestOnlyEnableICorProfilerInfo Test-only flag to allow attaching profiler tests to call ICorProfilerInfo interface, which would otherwise be disallowed for attaching profilers DWORD INTERNAL 0
TestOnlyEnableObjectAllocatedHook Test-only flag that forces CLR to initialize on startup as if ObjectAllocated callback were requested, to enable post-attach ObjectAllocated functionality. DWORD INTERNAL 0
TestOnlyEnableSlowELTHooks Test-only flag that forces CLR to initialize on startup as if slow-ELT were requested, to enable post-attach ELT functionality. DWORD INTERNAL 0
ETWEnabled This flag is used on OSes < Vista to enable/disable ETW. It is disabled by default DWORD EXTERNAL 0 REGUTIL_default
ETWEnabled This flag is used on OSes >= Vista to enable/disable ETW. It is enabled by default DWORD EXTERNAL 1 REGUTIL_default
ETW_ObjectAllocationEventsPerTypePerSec Desired number of GCSampledObjectAllocation ETW events to be logged per type per second. If 0, then the default built in to the implementation for the enabled event (e.g., High, Low), will be used. STRING UNSUPPORTED REGUTIL_default
ProfAPI_ValidateNGENInstrumentation This flag enables additional validations when using the IMetaDataEmit APIs for NGEN'ed images to ensure only supported edits are made. DWORD UNSUPPORTED 0
PerfMapEnabled This flag is used on Linux to enable writing /tmp/perf-$pid.map. It is disabled by default DWORD EXTERNAL 0 REGUTIL_default
EnableIEHosting Allow activation of IE hosting DWORD UNSUPPORTED
NoGuiFromShim Turn off GUI in shim DWORD UNSUPPORTED
OnlyUseLatestCLR Big red switch for loading CLR DWORD UNSUPPORTED
FailOnInProcSxS Fails the process when a second runtime is loaded in-process DWORD UNSUPPORTED
UseLegacyV2RuntimeActivationPolicyDefaultValue Modifies the default value DWORD UNSUPPORTED
ErrorDialog Allow showing UI on error DWORD UNSUPPORTED
Fod Test the Feature On Demand installation DWORD UNSUPPORTED
FodPath Name of executable for Feature On Demand mockup STRING UNSUPPORTED
FodArgs Command line arguments to pass to the FOD process STRING UNSUPPORTED
FodLaunchAsync Whether to launch FOD asynchronously. DWORD UNSUPPORTED
FodConservativeMode Whether to be conservative wrt Fod launch. DWORD UNSUPPORTED
ApplicationMigrationRuntimeActivationConfigPath Provides a path in which to look for configuration files to be used for runtime activation, for application migration scenarios, before looking next to the EXE itself. DWORD EXTERNAL
TestOnlyEnsureImmersive Test-only flag used to indicate that it is expected that a process should be running as immersive. DWORD INTERNAL
EnableCoreClrHost Enables hosting coreclr from desktop mscoreei.dll to run windows store apps DWORD INTERNAL
AptcaAssemblyBreak Sets a breakpoint when checking if an assembly is APTCA or not STRING INTERNAL REGUTIL_default
AptcaAssemblySharingBreak Sets a breakpoint when checking if we can code share an assembly STRING INTERNAL
AptcaAssemblySharingDomainBreak Sets a breakpoint only in the specified domain when checking if we can code share an assembly DWORD INTERNAL 0
DefaultSecurityRuleSet Overrides the security rule set that assemblies which don't explicitly select their own rule set should use DWORD INTERNAL 0
legacyCasPolicy Enable CAS policy for the process - for test use only, official access to this switch is through NetFx40_LegacySecurityPolicy. DWORD EXTERNAL 0
loadFromRemoteSources Enable loading from zones that are not MyComputer when not in CAS mode. DWORD EXTERNAL 0
LogTransparencyErrors Add an entry to the CLR log file for all transparency errors, rather than throwing an exception DWORD UNSUPPORTED 0
NetFx40_LegacySecurityPolicy Enable CAS policy for the process. DWORD EXTERNAL 0
NGenForPartialTrust Force NGEN to generate code for assemblies that could be used in partial trust. DWORD INTERNAL 0
TransparencyFieldBreak Sets a breakpoint when figuring out the transparency of a specific field STRING INTERNAL REGUTIL_default
TransparencyMethodBreak Sets a breakpoint when figuring out the transparency of a specific method STRING INTERNAL REGUTIL_default
TransparencyTypeBreak Sets a breakpoint when figuring out the transparency of a specific type STRING INTERNAL REGUTIL_default
AlwaysInsertCallout Always insert security access/transparency/APTCA callouts DWORD INTERNAL 0
DisableAnonymouslyHostedDynamicMethodCreatorSecurityCheck Disables security checks for anonymously hosted dynamic methods based on their creator's security. DWORD UNSUPPORTED 0
unsafeTypeForwarding Enable unsafe type forwarding between unrelated assemblies DWORD EXTERNAL 0
SOBreakOnProbeDuringSO DWORD INTERNAL 0 REGUTIL_default
SODumpViolationsDir STRING INTERNAL REGUTIL_default
SODumpViolationsStackTraceLength DWORD INTERNAL
SOEnableBackoutStackValidation DWORD INTERNAL
SOEnableDefaultRWValidation DWORD INTERNAL
SOEnableStackProtectionInDebugger DWORD INTERNAL 0 REGUTIL_default
SOEnableStackProtectionInDebuggerForProbeAtLine DWORD INTERNAL 0 REGUTIL_default
SOEntryPointProbe DWORD INTERNAL
SOInteriorProbe DWORD INTERNAL
SOLogger DWORD INTERNAL
SOProbeAssertOnOverrun DWORD INTERNAL
SOUpdateProbeAtLine DWORD INTERNAL 0 REGUTIL_default
SOUpdateProbeAtLineAmount DWORD INTERNAL 0 REGUTIL_default
SOUpdateProbeAtLineInFile STRING INTERNAL REGUTIL_default
StackWalkStressUsingOldImpl to be removed DWORD INTERNAL 0 REGUTIL_default
StackWalkStressUsingOS to be removed DWORD INTERNAL 0 REGUTIL_default
StartupDelayMS STRING EXTERNAL
StressCOMCall DWORD INTERNAL 0 REGUTIL_default
StressLog Turns on the stress log. DWORD UNSUPPORTED
ForceEnc Forces Edit and Continue to be on for all eligable modules. DWORD UNSUPPORTED
StressLogSize Stress log size in bytes per thread. DWORD UNSUPPORTED
StressOn Enables the STRESS_ASSERT macro that stops runtime quickly (to prevent the clr state from changing significantly before breaking) DWORD INTERNAL
stressSynchronized Unknown if or where this is used; unless a test is specifically depending on this, it can be removed. DWORD INTERNAL 0 REGUTIL_default
StressThreadCount DWORD EXTERNAL
DiagnosticSuspend DWORD INTERNAL 0
SuspendDeadlockTimeout DWORD INTERNAL 40000
SuspendThreadDeadlockTimeoutMs DWORD INTERNAL 2000
INTERNAL_ThreadSuspendInjection Specifies whether to inject activations for thread suspension on Unix DWORD INTERNAL 1
ThreadPool_ForceMinWorkerThreads Overrides the MinThreads setting for the ThreadPool worker pool DWORD INTERNAL 0
ThreadPool_ForceMaxWorkerThreads Overrides the MaxThreads setting for the ThreadPool worker pool DWORD INTERNAL 0
ThreadPool_DisableStarvationDetection Disables the ThreadPool feature that forces new threads to be added when workitems run for too long DWORD INTERNAL 0
ThreadPool_DebugBreakOnWorkerStarvation Breaks into the debugger if the ThreadPool detects work queue starvation DWORD INTERNAL 0
ThreadPool_EnableWorkerTracking Enables extra expensive tracking of how many workers threads are working simultaneously DWORD INTERNAL 0
Thread_UseAllCpuGroups Specifies if to automatically distribute thread across CPU Groups DWORD EXTERNAL 0
ThreadpoolTickCountAdjustment DWORD INTERNAL 0
HillClimbing_WavePeriod DWORD INTERNAL 4
HillClimbing_TargetSignalToNoiseRatio DWORD INTERNAL 300
HillClimbing_ErrorSmoothingFactor DWORD INTERNAL 1
HillClimbing_WaveMagnitudeMultiplier DWORD INTERNAL 100
HillClimbing_MaxWaveMagnitude DWORD INTERNAL 20
HillClimbing_WaveHistorySize DWORD INTERNAL 8
HillClimbing_Bias The 'cost' of a thread. 0 means drive for increased throughput regardless of thread count; higher values bias more against higher thread counts. DWORD INTERNAL 15
HillClimbing_MaxChangePerSecond DWORD INTERNAL 4
HillClimbing_MaxChangePerSample DWORD INTERNAL 20
HillClimbing_MaxSampleErrorPercent DWORD INTERNAL 15
HillClimbing_SampleIntervalLow DWORD INTERNAL 10
HillClimbing_SampleIntervalHigh DWORD INTERNAL 200
HillClimbing_GainExponent The exponent to apply to the gain, times 100. 100 means to use linear gain, higher values will enhance large moves and damp small ones. DWORD INTERNAL 200
INTERNAL_TypeLoader_InjectInterfaceDuplicates Injects duplicates in interface map for all types. DWORD INTERNAL 0
VirtualCallStubCollideMonoPct Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 0 REGUTIL_default
VirtualCallStubCollideWritePct Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 100 REGUTIL_default
VirtualCallStubDumpLogCounter Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 0 REGUTIL_default
VirtualCallStubDumpLogIncr Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 0 REGUTIL_default
VirtualCallStubLogging Worth keeping, but should be moved into '#ifdef STUB_LOGGING' blocks. This goes for most (or all) of the stub logging infrastructure. DWORD patsubst(EXTERNAL_VirtualCallStubLogging, _.*, ) 0 patsubst(patsubst(CLRConfig::REGUTIL_default, CLRConfig::, ),
VirtualCallStubMissCount Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 100 REGUTIL_default
VirtualCallStubResetCacheCounter Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 0 REGUTIL_default
VirtualCallStubResetCacheIncr Used only when STUB_LOGGING is defined, which by default is not. DWORD INTERNAL 0 REGUTIL_default
DisableWatsonForManagedExceptions disable Watson and debugger launching for managed exceptions DWORD INTERNAL 0
ZapBBInstr STRING INTERNAL REGUTIL_default
ZapBBInstrDir STRING EXTERNAL
ZapDisable DWORD EXTERNAL 0
ZapExclude STRING INTERNAL REGUTIL_default
ZapOnly STRING INTERNAL REGUTIL_default
ZapRequire DWORD EXTERNAL
ZapRequireExcludeList STRING EXTERNAL
ZapRequireList STRING EXTERNAL
ZapSet STRING EXTERNAL REGUTIL_default
ZapLazyCOWPagesEnabled DWORD INTERNAL 1
ZapLazyCOWPagesEnabled DWORD INTERNAL 0
DebugAssertOnMissedCOWPage DWORD INTERNAL 1
ReadyToRun Enable/disable use of ReadyToRun native code DWORD EXTERNAL 1 // On by default for CoreCLR
ReadyToRun Enable/disable use of ReadyToRun native code DWORD EXTERNAL 0 // Off by default for desktop
EnableEventLog Enable/disable use of EnableEventLogging mechanism DWORD EXTERNAL 0 // Off by default
ExposeExceptionsInCOM DWORD INTERNAL
PreferComInsteadOfManagedRemoting When communicating with a cross app domain CCW, use COM instead of managed remoting. DWORD EXTERNAL 0
GenerateStubForHost Forces the host hook stub to be built for all unmanaged calls, even when not running hosted. DWORD INTERNAL 0
legacyApartmentInitPolicy DWORD EXTERNAL
legacyComHierarchyVisibility DWORD EXTERNAL
legacyComVTableLayout DWORD EXTERNAL
newComVTableLayout DWORD EXTERNAL
PInvokeInline STRING EXTERNAL REGUTIL_default
InteropValidatePinnedObjects After returning from a managed-to-unmanged interop call, validate GC heap around objects pinned by IL stubs. DWORD UNSUPPORTED 0
InteropLogArguments Log all pinned arguments passed to an interop call DWORD EXTERNAL 0
LogCCWRefCountChange Outputs debug information and calls LogCCWRefCountChange_BREAKPOINT when AddRef or Release is called on a CCW. STRING UNSUPPORTED
EnableRCWCleanupOnSTAShutdown Performs RCW cleanup when STA shutdown is detected using IInitializeSpy in classic processes. DWORD INTERNAL 0
LocalWinMDPath Additional path to probe for WinMD files in if a WinRT type is not resolved using the standard paths. STRING INTERNAL
AllowDComReflection Allows out of process DCOM clients to marshal blocked reflection types. DWORD EXTERNAL 0
3gbEatMem Testhook: Size of memory (in 64K chunks) to be reserved before CLR starts DWORD UNSUPPORTED 0 REGUTIL_default
ActivatePatchSkip allows an assert when ActivatePatchSkip is called DWORD INTERNAL 0 REGUTIL_default
AlwaysCallInstantiatingStub Forces the Jit to use the instantiating stub for generics DWORD INTERNAL 0 REGUTIL_default
alwaysFlowImpersonationPolicy Windows identities should always flow across async points DWORD EXTERNAL FALSE
AlwaysUseMetadataInterfaceMapLayout Used for debugging generic interface map layout. DWORD INTERNAL
AssertOnUnneededThis While the ConfigDWORD is unnecessary, the contained ASSERT should be kept. This may result in some work tracking down violating MethodDescCallSites. DWORD INTERNAL 0
AssertStacktrace DWORD INTERNAL 1 REGUTIL_default
BuildFlavor Choice of build flavor (wks or svr) of CLR STRING UNSUPPORTED
CerLogging In vm\ConstrainedExecutionRegion.cpp. Debug-only logging when we prepare methods, find reliability contract problems, restore stuff from ngen images, etc. DWORD INTERNAL 0
clearNativeImageStress DWORD INTERNAL 0 REGUTIL_default
CLRLoadLogDir Enable logging of CLR selection STRING INTERNAL
CONFIG Used to specify an XML config file for EEConfig STRING EXTERNAL REGUTIL_default
CopyPropMax Sets internal jit constants for CopyProp STRING INTERNAL REGUTIL_default
CPUFamily DWORD INTERNAL
CPUFeatures DWORD INTERNAL
DeadCodeMax Sets internal jit constants for Dead Code elmination STRING INTERNAL REGUTIL_default
DefaultVersion Version of CLR to load. STRING INTERNAL
developerInstallation Flag to enable DEVPATH binding feature STRING EXTERNAL // TODO: check special handling
shadowCopyVerifyByTimestamp Fusion flag to enable quick verification of files in the shadow copy directory by using timestamps. DWORD EXTERNAL 0 FavorConfigFile / MayHavePerformanceDefault
disableFusionUpdatesFromADManager Fusion flag to prevent changes to the AppDomainSetup object made by implementations of AppDomainManager.InitializeNewDomain from propagating to Fusion DWORD EXTERNAL 0 FavorConfigFile
disableCachingBindingFailures Fusion flag to re-enable Everett bind caching behavior (Whidbey caches failures for sharing) DWORD EXTERNAL 0 FavorConfigFile
enableVerboseInstallLogging Fusion flag to enable detailed logging of GAC install operations DWORD INTERNAL 0
disableCommitThreadStack This should only be internal but I believe ASP.Net uses this DWORD EXTERNAL
DisableConfigCache Used to disable the 'probabilistic' config cache, which walks through the appropriate config registry keys on init and probabilistically keeps track of which exist. DWORD EXTERNAL 0 REGUTIL_default
DisableStackwalkCache DWORD EXTERNAL
DoubleArrayToLargeObjectHeap Controls double[] placement DWORD UNSUPPORTED
DumpConfiguration Dumps runtime properties of xml configuration files to the log. DWORD INTERNAL 0
DumpOnClassLoad Dumps information about loaded class to log. STRING INTERNAL
EnableInternetHREFexes Part of security work related to locking down Internet No-touch deployment. It's not clear what happens to NTD in v4, but if it's till there the setting is needed DWORD EXTERNAL 0 (LookupOptions) (REGUTIL_default / IgnoreEnv / IgnoreHKCU)
enforceFIPSPolicy Causes crypto algorithms which have not been FIPS certified to throw an exception if they are used on a machine that requriess FIPS enforcement DWORD EXTERNAL
ExpandAllOnLoad DWORD INTERNAL
FORCE_ASSEMREF_DUPCHECK ? Has comment: Allow Avalon to use the SecurityCriticalAttribute ? but WHY? DWORD UNSUPPORTED 0 REGUTIL_default
ForcedRuntime Verify version of CLR loaded STRING INTERNAL
ForceRelocs DWORD INTERNAL 0 REGUTIL_default
GenerateLongJumpDispatchStubRatio Useful for testing VSD on AMD64 DWORD INTERNAL
generatePublisherEvidence If set, when the CLR loads an assembly that has an Authenticode signature we will verify that signature to generate Publisher evidence, at the expense of network hits and perf. DWORD EXTERNAL
HashStack DWORD INTERNAL 0 REGUTIL_default
HostManagerConfig DWORD INTERNAL (DWORD)-1
HostTestADUnload Alows setting Rude unload as default DWORD INTERNAL 0
HostTestThreadAbort DWORD INTERNAL 0
IgnoreDllMainReturn Don't check the return value of DllMain if this is set DWORD UNSUPPORTED 0 ConfigFile_ApplicationFirst
IJWEntrypointCompatMode Makes us run managed EP from DllMain. Basically brings the buggy behavior back. DWORD EXTERNAL 1 REGUTIL_default
InstallRoot Directory with installed CLRs STRING INTERNAL
InvokeHalt Throws an assert when the given method is invoked through reflection. STRING INTERNAL
legacyHMACMode v2.0 of the CLR shipped with a bug causing HMAC-SHA-384 and HMAC-SHA-512 to be calculated incorrectly. Orcas fixes this bug, but the config flag is added so that code which must verify v2.0 RTM HMACs can still interop with them. DWORD EXTERNAL
legacyImpersonationPolicy Windows identities should never flow across async points DWORD EXTERNAL FALSE
legacyLoadMscorsnOnStartup Force mscorsn.dll to load when the VM starts DWORD UNSUPPORTED
legacyNullReferenceExceptionPolicy DWORD UNSUPPORTED
legacyUnhandledExceptionPolicy DWORD UNSUPPORTED
legacyVirtualMethodCallVerification DWORD EXTERNAL
ManagedLogFacility ?Log facility for managed code using the log DWORD INTERNAL
MaxStackDepth DWORD INTERNAL
MaxStubUnwindInfoSegmentSize DWORD INTERNAL
MaxThreadRecord DWORD INTERNAL
MergeCriticalAttributes DWORD EXTERNAL 1 REGUTIL_default
MessageDebugOut DWORD INTERNAL 0
MscorsnLogging Enables strong name logging DWORD INTERNAL 0 REGUTIL_default
NativeImageRequire DWORD EXTERNAL 0 REGUTIL_default
NestedEhOom DWORD INTERNAL 0 REGUTIL_default
NO_SO_NOT_MAINLINE DWORD EXTERNAL 0 REGUTIL_default
NoGuiOnAssert DWORD INTERNAL INTERNAL_NoGuiOnAssert_Default REGUTIL_default
NoProcedureSplitting DWORD EXTERNAL 0 REGUTIL_default
NoStringInterning Disallows string interning. I see no value in it anymore. DWORD INTERNAL 1 REGUTIL_default
NotifyBadAppCfg Whether to show a message box for bad application config file. DWORD EXTERNAL
PauseOnLoad Stops in SystemDomain::init. I think it can be removed. DWORD INTERNAL
PerfAllocsSizeThreshold Log facility LF_GCALLOC logs object allocations. This flag controls which ones also log stacktraces. Predates ClrProfiler. DWORD INTERNAL 0x3FFFFFFF
PerfNumAllocsThreshold Log facility LF_GCALLOC logs object allocations. This flag controls which ones also log stacktraces. Predates ClrProfiler. DWORD INTERNAL 0x3FFFFFFF
PerfTypesToLog Log facility LF_GCALLOC logs object allocations. This flag controls which ones also log stacktraces. Predates ClrProfiler. STRING INTERNAL
PEVerify DWORD EXTERNAL 0 REGUTIL_default
Prepopulate1 DWORD EXTERNAL 1
PrestubGC STRING INTERNAL
PrestubHalt STRING INTERNAL
RepositoryDir STRING EXTERNAL REGUTIL_default
RepositoryFlags DWORD EXTERNAL
RestrictedGCStressExe STRING EXTERNAL
ReturnSourceTypeForTesting allows returning the (internal only) source type of an IL to Native mapping for debugging purposes DWORD INTERNAL 0 REGUTIL_default
RSStressLog allows turning on logging for RS startup DWORD UNSUPPORTED 0 REGUTIL_default
SafeHandleStackTraces Debug-only ability to get a stack trace attached to every SafeHandle instance at creation time, for tracking down handle corruption problems. DWORD INTERNAL
SaveThreadInfo DWORD INTERNAL
SaveThreadInfoMask DWORD INTERNAL
SBDumpOnNewIndex Used for Syncblock debugging. It's been a while since any of those have been used. DWORD INTERNAL 0
SBDumpOnResize Used for Syncblock debugging. It's been a while since any of those have been used. DWORD INTERNAL 0
SBDumpStyle Used for Syncblock debugging. It's been a while since any of those have been used. DWORD INTERNAL 0
ShimDatabaseVersion Force using shim database version in registry STRING UNSUPPORTED
SleepOnExit Used for lrak detection. I'd say deprecated by umdh. DWORD UNSUPPORTED 0
StubLinkerUnwindInfoVerificationOn DWORD INTERNAL
SuccessExit DWORD UNSUPPORTED 0 REGUTIL_default
SupressAllowUntrustedCallerChecks Disable APTCA DWORD INTERNAL 0
SymbolReadingPolicy Specifies when PDBs may be read DWORD EXTERNAL
TestDataConsistency allows ensuring the left side is not holding locks (and may thus be in an inconsistent state) when inspection occurs DWORD UNSUPPORTED FALSE
ThreadGuardPages DWORD EXTERNAL 0 REGUTIL_default
Timeline DWORD EXTERNAL 0 REGUTIL_default
TlbImpShouldBreakOnConvFunction STRING INTERNAL REGUTIL_default
TlbImpSkipLoading DWORD INTERNAL
TotalStressLogSize Total stress log size in bytes. DWORD UNSUPPORTED
TraceIUnknown DWORD EXTERNAL
TraceWrap DWORD EXTERNAL
TURNOFFDEBUGINFO DWORD EXTERNAL
UseGenericTlsGetters DWORD EXTERNAL 0
useLegacyIdentityFormat Fusion flag to switch between Whidbey and Everett textual identity parser (have semantic differences) DWORD EXTERNAL 0 FavorConfigFile
UseMethodDataCache Used during feature development; may now be removed. DWORD EXTERNAL FALSE
UseNewCrossDomainRemoting Forces the managed remoting stack to be used even for cross-domain remoting if set to 0 (default is 1) DWORD EXTERNAL
UseParentMethodData Used during feature development; may now be removed. DWORD EXTERNAL TRUE
VerifierOff DWORD INTERNAL
VerifyAllOnLoad DWORD EXTERNAL
Version Version of CLR to load. STRING INTERNAL
ShimHookLibrary Path to a DLL that should be notified when shim loads the runtime DLL. STRING INTERNAL