[MPICH] tricks for avioding locking problems

[Foucar, James G]

Let's not focus on NFS at the moment. What I really need is a way, trick, or hack that allows me to circumvent or disable file locking in general. Does such a thing exist?

Thanks,
Jim


-----Original Message-----
From: Rajeev Thakur [mailto:thakur at mcs.anl.gov]
Sent: Tue 6/21/2005 3:25 PM
To: Foucar, James G; mpich-discuss at mcs.anl.gov
Subject: RE: [MPICH] tricks for avioding locking problems
 
One way to avoid this problem is to not use NFS :-).
 
Do you have the lockd daemon running on all nodes?
 
Rajeev


  _____  

From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Foucar, James G
Sent: Tuesday, June 21, 2005 4:12 PM
To: mpich-discuss at mcs.anl.gov
Subject: [MPICH] tricks for avioding locking problems



Hello,

I was wondering if any of you know of ways to avoid the following error:

> File locking failed in ADIOI_Set_lock. If the file system is NFS, you
> need to use NFS version 3 and mount the directory with the 'noac' option
> (no attribute caching).
> [0] MPI Abort by user Aborting program !
> [0] Aborting program!
> p0_928:  p4_error: : 1
> exit 1

This error, and similar errors, have popped up randomly on all many file
systems, regardless of whether they were mounted with attribute caching.

I have tried using the MPI_MODE_UNIQUE_OPEN flag when opening files and some
other tricks, but nothing seems to get rid of this problem permanently on
all the various platforms that I need to support.

What I really need is a general way to tell MPICH not to use any file
locking or at least some way to avoid this error.

Thanks!
-Jim 


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