This Profiler has been superceded by ROCm-Profiler for ROCm Platform AMD's HSA enabled GPU computing platform
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AMDTActivityLogger
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README.md

README.md

##This Profiler has been superceded by ROCm-Profiler for ROCm Platform AMD's HSA enabled GPU computing platform https://github.com/RadeonOpenCompute/ROCm-Profiler

HSA Profiler September 2015 Release

Overview

This release of the HSA Profiler is compatible with the September 2015 HSA runtime release (release 1.0.3). This is a feature-complete version of the profiler with the HSA Profiling feature set nearly on par with the CodeXL OpenCL Profiler.

This build of the profiler is supported on Kaveri and Carrizo (perf counter collection is not supported on Carrizo).

Information contained here is specific to sprofile version 3.1.9780

The HSA Profiler is integrated into the CodeXL GPU Profiler Backend (aka "sprofile"). There are two new command-line switches used to tell sprofile to profile an HSA application: --hsatrace and --hsapmc

####Table of Contents

  • [Collecting an Application Trace] (#ApplicationTrace)
  • [Collecting GPU Performance Counters] (#PerfCounters)
  • [System Setup] (#SystemSetup)
  • [Sample Usage] (#SampleUsage)
  • [Using with CodeXL 1.8] (#CodeXL1.8)
  • [Known Issues] (#KnownIssues)
  • [License] (Legal/CodeXLEndUserLicenseAgreement-Linux.htm)
#### Collecting an Application Trace

To collect an application trace with kernel timestamps:

./sprofile --hsatrace AppToProfile

Executing sprofile with the --hsatrace switch will launch the specified "AppToProfile" and allow the profiler to trace all HSA APIs called by the application. In addition, the profiler will also gather 2 sets of timestamp information:

  • Host-side CPU timestamps for all HSA APIs called by the application
  • Device-side GPU timestamps for all HSA kernels dispatched by the application

The results from the profiler will be written to an .atp file that is very similar to the .atp file written by CodeXL's OpenCL profiler. When profiling an HSA application, the .atp file will have four main sections, the first three of which are similar to the sections written by the OpenCL profiler. The CodeXL documentation contains detailed information on the contents of the .atp file for an OpenCL application.

Here is a brief description of the .atp file sections for the HSA profiler:

  • The first section is a file header containing information about the application profiled, the system the profile was gathered on, and some of the options used to gather the profile.
  • The second section is the API trace, showing a per-thread list of all HSA APIs called by the application. For each API, the parameters passed and the values returned by the the API are shown.
  • The third section is the host-side timestamps section, showing a per-thread list of all HSA APIs called by the application. For each API, a start time and end time is shown.
  • The fourth section is new for HSA. It is the device-side kernel timestamp section, showing a list of each kernel dispatched by the application. For each kernel, the following information is shown:
  • the name of the kernel symbol associated with the kernel dispatched (or "" if the profiler could not extract the symbol name.)
  • the kernel pointer value of the kernel dispatched.
  • the start timestamp of the kernel, indicating when the kernel started executing on the device. The timestamps represent nanoseconds.
  • the end timestamp of the kernel, indicating when the kernel finished executing on the device. The timestamps represent nanoseconds.
  • the duration of the kernel (in nanoseconds).
  • the agent handle of the agent the kernel was dispatched to.

Most other sprofile switches will also work with the --hsatrace switch:

  • You can control the name and location of the .atp file using sprofile's --outputfile switch.
  • You can generate a subset of the Trace Summary pages using sprofile's --tracesummary and --atpfile switch. For instance: ./sprofile --tracesummary --atpfile myapp.atp will generate an API summary, a kernel summary and a top-ten kernel dispatch list from the data contained in the myapp.atp file. It will also produce a "Best Practices" summary file by applying a rules-based analysis of the .atp file. Currently two rules are supported:
  • An error will be reported if any HSA API returns an error code
  • A resource leak will be reported for mismatched create/destroy calls (i.e. if the application calls hsa_queue_create without a corresponding hsa_queue_destroy call)
  • Similarly, you can generate a summary while collecting a trace using the following command line: ./sprofile --hsatrace --tracesummary ApptoProfile
  • The following switches should also work:
  • --envvar
  • --envvarfile
  • --fullenv
  • --sessionname
  • --workingdirectory
  • --interval
  • --maxapicalls
  • --apifilterfile
  • --sym
  • The following switches are not applicable to the HSA Profiler:
  • --nocollapse
  • --ret

You can get more information on the switches mentioned above by reading the CodeXL User Guide or by executing:

./sprofile --hsatrace --help

A version of the AMDTActivityLogger instrumentation library which is supported by the HSA profiler is also included in this distribution. Using this API, you can annotate your code and have the annotations appear in the timeline UI in CodeXL. The latest version of the AMDTActivityLogger library also contains new APIs for controlling the collection of profiling data from within a profiled application. Documentation on the AMDTActivityLogger API can be found in the distribution.

You can load an HSA .atp file into CodeXL 1.8 in order to see the application timeline. You can download the latest version of CodeXL 1.8 from the following location:

http://developer.amd.com/tools-and-sdks/opencl-zone/codexl/
## Collecting GPU Performance Counters

To collect GPU performance counters:

./sprofile --hsapmc AppToProfile

Executing sprofile with the --hsapmc switch will launch the specified "AppToProfile" and allow the profiler to collect GPU Performance Counter data for each kernel dispatched by the application. The output file will contain the following information for each kernel dispatched:

  • the name of the kernel symbol associated with the kernel dispatched (or "" if the profiler could not extract the symbol name.)
  • The following set of dispatch parameters and compiler stats for each kernel:
  • the thread id of the host thread that dispatched the kernel
  • the dimensions of the grid (in work-items)
  • the dimensions of the work-group (in work-items)
  • the size of the shared memory used by the work-group (the work-group group segment size)
  • the number of vector GPRs used by the kernel
  • the number of scalar GPRs used by the kernel
  • The values of any performance counters collected for the kernel

Most other sprofile switches will also work with the --hsapmc switch:

  • You can control the name and location of the .csv file using sprofile's --outputfile switch.
  • You can specify the performance counters to collect using the --counterlist switch.
  • A kernel occupancy file can be generated while collecting performance counters by specifying the --occupancy switch.
  • The following switches should also work:
  • --envvar
  • --envvarfile
  • --fullenv
  • --sessionname
  • --workingdirectory
  • --interval
  • --maxkernels
  • The following switches are either not implemented yet or are not applicable to the HSA Profiler:
  • --kerneloutput
  • --kernellistfile
  • --singlepass
  • --nogputime

The HSA Profiler can only support collecting a set of performance counters that can be collected in a single pass. It does not support kernel replay like the OpenCL profiler. Thus, if you do not specify a list of performance counters to collect, or if the set you specify can not be collected in a single pass, the profiler will not collect all of the counters. It will enable as many counters as it can fit into a single pass. To collect a full set of performance counters for an application, you will need to profile the application multiple times and specify a different set of counters for each profile run. Because of this restriction, the --singlepass and --nogputime switches are always enabled when profiling an HSA application.

## System Setup

This assumes you are starting from a system where you can run HSA applications outside of the profiler. The information here provides only additional steps you need to perform to be able to profile HSA applications. Please refer to https://github.com/HSAFoundation/HSA-Runtime-AMD for runtime and driver installation information.

In order to profile, you will need to make sure that the HSA runtime libraries (libhsa-runtime64.so, libhsa-runtime-ext64.so, libhsa-runtime-tools64.so, and libhsakmt.so) can be found and loaded by the application you are profiling. Starting with the 1.0.3 runtime release, libhsa-runtime-tools64.so is now included as part of the runtime. Thus, it is no longer distributed with the profiler. It is recommended that the LD_LIBRARY_PATH environment variable contains the following directory:

  • The location of libhsa-runtime64.so.1 and libhsa-runtime-tools64.so.1 (i.e. HSA-Runtime-AMD/lib)
## Sample Usage

You can profile the vector_copy sample contained in HSA-Runtime-AMD/sample using the following steps:

  • Build the vector_copy sample using make
  • Verify that the sample executable runs
  • Execute ./sprofile --hsatrace vector_copy
  • Execute ./sprofile --hsapmc vector_copy
## Using this build with CodeXL1.8

This build is compatible with CodeXL 1.8, which can be downloaded from the following location:

http://developer.amd.com/tools-and-sdks/opencl-zone/codexl/.

To use the CodeXL GUI to profile HSA applications and to analyze the results, please replace the following CodeXL files with the same-named files included here:

$(CODEXL-DIR)/x86_64/sprofile $(CODEXL-DIR)/x86_64/libHSAProfileAgent.so $(CODEXL-DIR)/x86_64/libHSATraceAgent.so $(CODEXL-DIR)/x86_64/libGPUPerfAPIHSA.so

## Known Issues * Kernel occupancy information will only be written to disk if the application being profiled calls hsa_shut_down * Collecting performance counters on a Carrizo HSA machine is disabled in this build.