> Ah, that could do it. Open MPI's shared memory files are under /tmp. So if > /tmp is NFS, you could get extremely high latencies because of dirty page > writes out through NFS. > > You don't necessarily have to make /tmp disk-full -- if you just make OMPI's > session directories go into a ramdisk instead of to NFS, that should also be > sufficient. >
I just browsed FAQ and "ompi_info --param all all", but didn't find the answer: How do I set the OMPI session directory to point it to a ramdisk? And another question: What would be a good size for the ram disk? One general value was supposed by the FAQ with 128MB, but what is your experience? (maybe a large topic by itself, so I have to try out, I guess) Thanks a lot. Oli -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
