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Once you add the linux command strace to the job you create two files per linux process (MPI task). For this example 32 trace files are created. Large MPI jobs can create a huge number of trace files, e.g. a 128 node job with 128 x 96 MPI tasks created 24576 files. For this investigation That is why we strongly recommend to reduce the MPI task number as far as possible.
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