[FLASH-USERS] hdf5_parallel performance
Brock Palen
brockp at umich.edu
Thu Oct 23 10:02:39 EDT 2008
We are doing our firsts tests of using parallel hdf5 for flash2. The
backing filesystem is lustre.
Raw performance to lustre from 10 hosts using MPI_File_write() is
about 650MB/s.
Looks like writing plot files from 40 hosts is only about 40MB/s no
matter the stripe count I use.
Our plot files are around 1.5GB.
Is there any insight into tuning? writing takes 30 seconds which is
much longer than we would like it to be for such a small file.
Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
brockp at umich.edu
(734)936-1985
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