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[CAS] llvm-cas-test improvements #11286

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Merged
merged 3 commits into from
Sep 2, 2025
Merged

[CAS] llvm-cas-test improvements #11286

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26ee49b
[CAS] llvm-cas-test fillData in RunSafely
cachemeifyoucan Aug 29, 2025
9f0121f
[CAS] Allow stress test parameter to control global parameter
cachemeifyoucan Aug 29, 2025
0c3c5b7
[CAS] Fix llvm-cas-test to correctly respect file precentage
cachemeifyoucan Aug 31, 2025
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72 changes: 38 additions & 34 deletions llvm/tools/llvm-cas-test/llvm-cas-test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
#include "llvm/CAS/BuiltinUnifiedCASDatabases.h"
#include "llvm/CAS/ObjectStore.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/CrashRecoveryContext.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
Expand Down Expand Up @@ -89,11 +90,11 @@ struct Config {

void constrainParameters() {
// reduce the size of parameter if they are too big.
NumShards = NumShards % MaxShards;
NumChildren = NumChildren % MaxChildren;
TreeDepth = TreeDepth % MaxDepth;
DataLength = DataLength % MaxDataLength;
PrecentFile = PrecentFile % 100;
NumShards = OptNumShards ? OptNumShards : NumShards % MaxShards;
NumChildren = OptNumChildren ? OptNumChildren : NumChildren % MaxChildren;
TreeDepth = OptTreeDepth ? OptTreeDepth : TreeDepth % MaxDepth;
DataLength = OptDataLength ? OptDataLength : DataLength % MaxDataLength;
PrecentFile = OptPrecentFile ? OptPrecentFile : PrecentFile % 100;

if (ForceKill) {
Settings |= Fork;
Expand All @@ -102,7 +103,7 @@ struct Config {
}

bool extendToFile(uint8_t Seed) const {
return ((float)Seed / (float)UINT8_MAX) > ((float)PrecentFile / 100.0f);
return ((float)Seed / (float)UINT8_MAX) < ((float)PrecentFile / 100.0f);
}

void init() {
Expand Down Expand Up @@ -139,35 +140,39 @@ static void fillData(ObjectStore &CAS, ActionCache &AC, const Config &Conf) {
DefaultThreadPool ThreadPool(hardware_concurrency());
for (size_t I = 0; I != Conf.NumShards; ++I) {
ThreadPool.async([&] {
std::vector<ObjectRef> Refs;
for (unsigned Depth = 0; Depth < Conf.TreeDepth; ++Depth) {
unsigned NumNodes = (Conf.TreeDepth - Depth + 1) * Conf.NumChildren + 1;
std::vector<ObjectRef> Created;
Created.reserve(NumNodes);
ArrayRef<ObjectRef> PreviouslyCreated(Refs);
for (unsigned I = 0; I < NumNodes; ++I) {
std::vector<char> Data(Conf.DataLength);
getRandomBytes(Data.data(), Data.size());
// Use the first byte that generated to decide if we should make it
// 64KB bigger and force that into a file based storage.
if (Conf.extendToFile(Data[0]))
Data.resize(64LL * 1024LL + Conf.DataLength);

if (Depth == 0) {
auto Ref = ExitOnErr(CAS.store({}, Data));
Created.push_back(Ref);
} else {
auto Parent = PreviouslyCreated.slice(I, Conf.NumChildren);
auto Ref = ExitOnErr(CAS.store(Parent, Data));
Created.push_back(Ref);
CrashRecoveryContext CRC;
CRC.RunSafely([&]() {
std::vector<ObjectRef> Refs;
for (unsigned Depth = 0; Depth < Conf.TreeDepth; ++Depth) {
unsigned NumNodes =
(Conf.TreeDepth - Depth + 1) * Conf.NumChildren + 1;
std::vector<ObjectRef> Created;
Created.reserve(NumNodes);
ArrayRef<ObjectRef> PreviouslyCreated(Refs);
for (unsigned I = 0; I < NumNodes; ++I) {
std::vector<char> Data(Conf.DataLength);
getRandomBytes(Data.data(), Data.size());
// Use the first byte that generated to decide if we should make it
// 64KB bigger and force that into a file based storage.
if (Conf.extendToFile(Data[0]))
Data.resize(64LL * 1024LL + Conf.DataLength);

if (Depth == 0) {
auto Ref = ExitOnErr(CAS.store({}, Data));
Created.push_back(Ref);
} else {
auto Parent = PreviouslyCreated.slice(I, Conf.NumChildren);
auto Ref = ExitOnErr(CAS.store(Parent, Data));
Created.push_back(Ref);
}
}
// Put a self mapping in action cache to avoid cache poisoning.
if (!Created.empty())
ExitOnErr(
AC.put(CAS.getID(Created.back()), CAS.getID(Created.back())));
Refs.swap(Created);
}
// Put a self mapping in action cache to avoid cache poisoning.
if (!Created.empty())
ExitOnErr(
AC.put(CAS.getID(Created.back()), CAS.getID(Created.back())));
Refs.swap(Created);
}
});
});
}
ThreadPool.wait();
Expand All @@ -181,7 +186,6 @@ static int genData() {

auto DB = ExitOnErr(cas::createOnDiskUnifiedCASDatabases(CASPath));
fillData(*DB.first, *DB.second, Conf);

return 0;
}

Expand Down