[mpich-discuss] shared memory mmap file

[Dave Goodell]

On Feb 4, 2013, at 11:05 AM CST, Dustin Sorge wrote:

> I can get MPICH working without it, however I am doing some NFS testing and having that file mounted over NFS would be a very interesting use case for me.  I would like to avoid mounting /tmp over NFS so i wanted to see if there was a way to specifying another path for the file.   

You probably don't want to be accessing this file directly, and especially not over NFS.  The only reason a file exists is as a way for all processes to map the same memory.  IIRC the file should actually be unlinked (deleted) as soon as all processes on the node have mmap-ed it.

Can you explain more about what you are actually trying to accomplish?

-Dave