[mpich-discuss] shared memory mmap file

[Dustin Sorge]

Fair enough.  Thank you very much for the info.

Much appreciated,
   -Dustin


On Mon, Feb 4, 2013 at 1:43 PM, Dave Goodell <goodell at mcs.anl.gov> wrote:

> 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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