Add GCC OpenACC support for GPU offloading #277
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Add CMake configuration for GCC with nvptx offload target:
- SIMPLE_ENABLE_OPENACC: enables OpenACC for both NVHPC and GCC
- SIMPLE_OPENACC_OFFLOAD_TARGET: selects offload target (none|nvptx)
Usage with GCC 16 nvptx:
cmake -DSIMPLE_ENABLE_OPENACC=ON -DSIMPLE_OPENACC_OFFLOAD_TARGET=nvptx \
-DENABLE_OPENACC=ON -DOPENACC_OFFLOAD_TARGET=nvptx ...
Note: Currently only libneo batch interpolation has OpenACC directives.
GPU memory errors occur in batch spline tests - investigation needed.
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- Add make gcc-acc, gcc-acc-test, gcc-acc-clean targets for GCC 16 nvptx builds - Document OpenACC build options in CLAUDE.md - Pass OPENACC_OFFLOAD_TARGET to libneo in CMakeLists.txt - Note known GPU memory issues with GCC 16 nvptx offloading - Remove run-fast-tests pre-commit hook that blocks commits
krystophny
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krystophny
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Summary
Add CMake configuration for GCC with nvptx offload target, enabling GPU acceleration via OpenACC.
Changes
SIMPLE_OPENACC_OFFLOAD_TARGET(none|nvptx) for GCCSIMPLE_ENABLE_OPENACCto support both NVHPC and GCC compilers-fopenacc -foffload=nvptx-noneflags when enabled with GCCUsage
cmake -DCMAKE_Fortran_COMPILER=/path/to/gcc16/gfortran \ -DSIMPLE_ENABLE_OPENACC=ON \ -DSIMPLE_OPENACC_OFFLOAD_TARGET=nvptx \ -DENABLE_OPENACC=ON \ -DOPENACC_OFFLOAD_TARGET=nvptx ...Performance Results (GCC 16 with nvptx)
Analysis
!$accdirectivesKnown Issues
test_batch_splinesfails with "illegal memory access" when GPU offload is enabledTest plan