[mpich-discuss] shared memory mmap file

[Dustin Sorge]

What I was hoping was that I would be able to get some interesting NFS
locking testing by having multiple NFS clients all trying to use this file
while running an MPI job.


On Mon, Feb 4, 2013 at 12:08 PM, Dave Goodell <goodell at mcs.anl.gov> wrote:

> 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
>
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