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MPI and shared memory on Seaborg
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Mark Frederick Augustine Hoemmen
Apr 29, 2004, 11:21:17 AM4/29/04
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It looks like the default for MPI messages within a node on Seaborg
is not to use shared memory. I wonder how messages are passed then?
is not to use shared memory. I wonder how messages are passed then?
http://hpcf.nersc.gov/vendor_docs/ibm/pe/am106mst14.html#HDRSHARMEM
Edward Jason Riedy
Apr 29, 2004, 3:03:37 PM4/29/04
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And Mark Hoemmen writes:
- It looks like the default for MPI messages within a node on Seaborg
- is not to use shared memory. I wonder how messages are passed then?
- http://hpcf.nersc.gov/vendor_docs/ibm/pe/am106mst14.html#HDRSHARMEM
- It looks like the default for MPI messages within a node on Seaborg
- is not to use shared memory. I wonder how messages are passed then?
- http://hpcf.nersc.gov/vendor_docs/ibm/pe/am106mst14.html#HDRSHARMEM
And this one says otherwise:
http://hpcf.nersc.gov/computers/SP/scaling/mpi.php#mpi_ibm
IBM's default is no, Seaborg's default is yes. Direct LAPI
programs route all messages through the adapter, however.
Jason
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