Lassen: Fix Chunked HDF5 with MPI (#2863)

Try to work-around segfaults with HDF5 when running on more than one node.
ECP-WarpX · Feb 17, 2022 · a6f876a · a6f876a
1 parent cc42965
commit a6f876a
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Tools/machines/lassen-llnl/lassen.bsub b/Tools/machines/lassen-llnl/lassen.bsub
@@ -18,5 +18,9 @@
 #BSUB -o WarpXo.%J
 #BSUB -e WarpXe.%J
 
+# Work-around OpenMPI bug with chunked HDF5
+#   https://github.com/open-mpi/ompi/issues/7795
+export OMPI_MCA_io=ompio
+
 export OMP_NUM_THREADS=1
 jsrun -r 4 -a 1 -g 1 -c 7 -l GPU-CPU -d packed -b rs -M "-gpu" <path/to/executable> <input file> > output.txt