Implement pytest for 01_store/store_bench.py

[Copilot]

This PR adds pytest support for the 01_store/store_bench.py benchmark by following the established pattern from test_load_bench.py.

Changes Made

Added bench_store() function

• Extracted the core benchmarking logic from run_experiment() into a reusable bench_store() function
• Maintains the same signature pattern as bench_load() for consistency:

  def bench_store(shmem, source_rank, destination_rank, buffer, BLOCK_SIZE, dtype, 
                  verbose=False, validate=False, num_experiments=1, num_warmup=0)

Refactored run_experiment()

• Updated to use the new bench_store() function internally
• Maintains full backward compatibility with existing CLI usage
• Clean separation between argument parsing and benchmarking logic

Created test_store_bench.py

• Follows the exact pattern established by test_load_bench.py
• Parametrized tests covering different data types (int8, float16, bfloat16, float32)
• Tests various buffer sizes and block sizes (512, 1024)
• Properly imports the benchmark module and calls bench_store()

Fixed barrier synchronization issue

• Removed explicit warmup call and barrier that was causing deadlocks in test environment
• The iris.do_bench function handles warmup and barriers internally
• Now matches the synchronization pattern used in bench_load function

Testing Structure

The test follows the established pattern:

@pytest.mark.parametrize("dtype", [torch.int8, torch.float16, torch.bfloat16, torch.float32])
@pytest.mark.parametrize("buffer_size, heap_size", [((1 << 32), (1 << 33))])
@pytest.mark.parametrize("block_size", [512, 1024])
def test_store_bench(dtype, buffer_size, heap_size, block_size):
    # Test implementation

This implementation provides a clean, testable interface while making minimal changes to the existing codebase and maintaining full backward compatibility.

Fixes #56.

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[mawad-amd]

@copilot

tests/examples/test_store_bench.py::test_store_bench[512-4294967296-8589934592-dtype0] Fatal Python error: Aborted

Thread 0x00007ffb8433b640 (most recent call first):
  File "/opt/conda/envs/py_3.10/lib/python3.10/socket.py", line 293 in accept
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pytest_rerunfailures.py", line 433 in run_server
  File "/opt/conda/envs/py_3.10/lib/python3.10/threading.py", line 953 in run
  File "/opt/conda/envs/py_3.10/lib/python3.10/threading.py", line 1016 in _bootstrap_inner
  File "/opt/conda/envs/py_3.10/lib/python3.10/threading.py", line 973 in _bootstrap

Thread 0x00007ffb865bf740 (most recent call first):
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/torch/cuda/__init__.py", line 896 in synchronize
  File "/home/runner/_work/iris/iris/iris/iris.py", line 351 in barrier
  File "/home/runner/_work/iris/iris/examples/01_store/store_bench.py", line 130 in bench_store
  File "/home/runner/_work/iris/iris/tests/examples/test_store_bench.py", line 57 in test_store_bench
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/python.py", line 194 in pytest_pyfunc_call
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_callers.py", line 103 in _multicall
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_hooks.py", line 513 in __call__
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/python.py", line 1799 in runtest
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 169 in pytest_runtest_call
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_callers.py", line 103 in _multicall
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_hooks.py", line 513 in __call__
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 262 in <lambda>
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 341 in from_call
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 261 in call_runtest_hook
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 222 in call_and_report
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 133 in runtestprotocol
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/runner.py", line 114 in pytest_runtest_protocol
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_callers.py", line 103 in _multicall
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_hooks.py", line 513 in __call__
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/main.py", line 348 in pytest_runtestloop
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_callers.py", line 103 in _multicall
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_hooks.py", line 513 in __call__
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/main.py", line 323 in _main
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/main.py", line 269 in wrap_session
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/main.py", line 316 in pytest_cmdline_main
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_callers.py", line 103 in _multicall
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_manager.py", line 120 in _hookexec
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pluggy/_hooks.py", line 513 in __call__
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/config/__init__.py", line 166 in main
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/_pytest/config/__init__.py", line 189 in console_main
  File "/opt/conda/envs/py_3.10/lib/python3.10/site-packages/pytest/__main__.py", line 5 in <module>
  File "/opt/conda/envs/py_3.10/lib/python3.10/runpy.py", line 86 in _run_code
  File "/opt/conda/envs/py_3.10/lib/python3.10/runpy.py", line 196 in _run_module_as_main

Extension modules: numpy.core._multiarray_umath, numpy.core._multiarray_tests, numpy.linalg.lapack_lite, numpy.linalg._umath_linalg, numpy.fft._pocketfft_internal, numpy.random._common, numpy.random.bit_generator, numpy.random._bounded_integers, numpy.random._mt19937, numpy.random.mtrand, numpy.random._philox, numpy.random._pcg64, numpy.random._sfc64, numpy.random._generator, torch._C, torch._C._fft, torch._C._linalg, torch._C._nested, torch._C._nn, torch._C._sparse, torch._C._special, mpi4py.MPI, hip_utils, __triton_launcher (total: 24)
--------------------------------------------------------------------------
prterun noticed that process rank 0 with PID 802853 on node iris-githubrunner-mi3008x-5866b8ddb9-c5fh8 exited on
signal 6 (Aborted).
--------------------------------------------------------------------------
Error: Process completed with exit code 134.

[Copilot]

@copilot

tests/examples/test_store_bench.py::test_store_bench[512-4294967296-8589934592-dtype0] Fatal Python error: Aborted

...

Fixed the barrier deadlock issue. The problem was an explicit warmup call and barrier before iris.do_bench that was causing a deadlock. The iris.do_bench function handles warmup and barriers internally, so the explicit calls were redundant and problematic. Removed the explicit warmup to match the pattern used in bench_load. (e753e36)