Hello, I try to profile a parallel code on a large cluster (8cores per node, Intel_MPI & Open_MPI available) with mpirun ... valgrind --tool=callgrind --base=$PWD/callgrind.out ./exe ++ Everything seems fine when I profile from 1 to 8 cores (1 node) and CPU times is ok (10min with 8cores) - But, I get some empty callgrind.out.* files when I profile from 16 cores to XXX (and computing on different nodes) ; - And CPU times dramatically increase to ~1day since 16cores What would you suggest? Exclude all warnings with --gen-suppressions? Network options? Switch-off mpi-profiling? How? Try to reinstall valgrind? Thanks for your attention, Fabien
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