cmerge opened file hangs while writing
I tested the cmerge in sion_paropen_ompi. For me it happens for several (not all) SION_COLLSIZE/NUM_PROCS/OMP_NUM_THREADS combinations that the sion_coll_fwrite process hangs.
I can reproduce this behavior using the test_ompimrg1 on my local machine:
works: SION_COLLSIZE=2 OMP_NUM_THREADS=2 mpirun -np 4 ./test_ompimrg1 hangs: SION_COLLSIZE=4 OMP_NUM_THREADS=2 mpirun -np 4 ./test_ompimrg1