fixup

Author: PierreMarchand20

.github/workflows/CI.yml

@@ -135,10 +135,25 @@ jobs:
       - name: Run tests
         run: |
           export PYTHONPATH="$PWD/build"
-          mpirun -np 1 ${{ matrix.MPIEXEC_PREFLAGS }} python3 -m pytest tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
-          mpirun -np 2 ${{ matrix.MPIEXEC_PREFLAGS }} python3 -m pytest tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
-          mpirun -np 3 ${{ matrix.MPIEXEC_PREFLAGS }} python3 -m pytest tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
-          mpirun -np 4 ${{ matrix.MPIEXEC_PREFLAGS }} python3 -m pytest tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
+          export GCOV_PREFIX_STRIP=2
+          COVDIR=/tmp/gcov-mpi
+          mkdir -p $COVDIR
+
+          # Wrap mpirun calls so each rank writes to its own subdir
+          run_mpi_pytest() {
+            local np=$1
+            shift
+            mpirun -np $np ${{ matrix.MPIEXEC_PREFLAGS }} \
+              bash -c 'export GCOV_PREFIX='"$COVDIR"'/${OMPI_COMM_WORLD_RANK}; \
+                       mkdir -p $GCOV_PREFIX; \
+                       python3 -m pytest "$@"' bash "$@"
+          }
+          
+          run_mpi_pytest 1 tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
+          run_mpi_pytest 2 tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
+          run_mpi_pytest 3 tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
+          run_mpi_pytest 4 tests --ignore=tests/test_hmatrix.py --ignore=tests/test_logger.py
+
           python3 -m pytest tests/test_hmatrix.py
           python3 -m pytest tests/test_logger.py