[mpich-discuss] shared memory mmap file

[Dave Goodell]

There shouldn't be any (explicit) file locking going on w.r.t. this file, at least as far as I know.

-Dave

On Feb 4, 2013, at 11:28 AM CST, Dustin Sorge wrote:

> 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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