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MPI Ranks Filtering Test
This test validates the --mpi-ranks feature of rocprofv3, which allows selective profiling of specific MPI ranks.
Test Scenarios
1. With MPI - Single Rank (with-mpi-single)
- Runs with 4 MPI processes using
mpirun -n 4 - Uses
--mpi-ranks 0to profile only rank 0 - Expected behavior: Only rank 0 should generate profiling output files
- Validation: Checks that exactly 1 JSON/CSV output file exists with valid profiling data
2. With MPI - Multiple Ranks (with-mpi-multiple)
- Runs with 4 MPI processes using
mpirun -n 4 - Uses
--mpi-ranks 0-1,3to profile ranks 0, 1, and 3 - Expected behavior: Ranks 0, 1, and 3 should generate output; rank 2 should not
- Validation: Checks that exactly 3 JSON/CSV output files exist with valid profiling data
3. Without MPI (without-mpi)
- Runs without MPI (single process)
- Uses
--mpi-ranks 0but no MPI environment is detected - Expected behavior: Since no MPI environment is detected, rocprofv3 should generate output normally
- Validation: Checks that at least 1 JSON/CSV output file exists with valid profiling data
Graceful Degradation
The test ensures that:
- If mpirun is not available: The MPI-based tests are skipped (not failed)
- If only single GPU available: The test still runs correctly
- If no MPI environment detected: The
--mpi-ranksflag is gracefully ignored and profiling proceeds normally
Test Structure
CMakeLists.txt: Defines the test configurations and conditionally includes them based on mpirun availabilityconftest.py: pytest configuration providing fixtures for output directory and test modevalidate.py: Main test script that validates the output based on the test modepytest.ini: pytest configuration file
Running the Tests
The tests are automatically run as part of the rocprofiler-sdk test suite:
# Run all tests
ctest -R rocprofv3-test-mpi-ranks
# Run specific test
ctest -R rocprofv3-test-mpi-ranks-with-mpi-single -VV
# Run without MPI test only
ctest -R rocprofv3-test-mpi-ranks-without-mpi -VV
Requirements
- ROCm with HIP support
- rocprofiler-sdk installed
- MPI implementation (OpenMPI, MPICH, etc.) - optional for MPI tests
- pytest with Python 3
- At least one AMD GPU (tests work with single GPU)