[mpich-discuss] Are there limits to MPICH2 Jobs?

[Rajeev Thakur]

Nothing in MPICH2 should prevent the job from running on > 2GB memory. The
problem is likely to be in the environment running MPICH2, such as the stack
size limit Lester mentions.
 
Rajeev
 


  _____  

From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Cavey, Lester
Sent: Saturday, May 03, 2008 3:33 PM
To: mpich-discuss at mcs.anl.gov
Subject: RE: [mpich-discuss] Are there limits to MPICH2 Jobs?



Ibrahim,

 

I'm not an expert on this, but we used the ulimit command, in our bash rc
files, to increase our stack size limit.  Then our 32-bit linux system was
able iterate through more loops while running our application (a
particle-in-cell simulator).  Eventually though there was a limit to the
number of loops that ran, before a "segmentation fault" was reported.  In
our case, this meant we had a stack overflow, since there is always going to
be a maximum stack size that can not be exceeded.

 

I'm sure the ANL guys can give you more advice, besides just trying the
ulimit command.

 

Lester


  _____  


From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Attieh, Ibrahim
Sent: Saturday, May 03, 2008 12:03 PM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] Are there limits to MPICH2 Jobs?

 

Hello, 

We are trying to run the Monte Carlo code MCNP with MPICH2.  However, we are
having problems with jobs bigger than 2 gigabytes. The jobs we want to run
are as big as 9 gigabytes.  We are running the jobs on a linux system with
64-bit operating system.

Are there any limits to the size of the files that MPICH2 could handle?  Are
there any options that we need to set for MPICH2 to handle such large jobs?

Your help would be greatly appreciated. 

Thanks, 
Ibrahim Attieh 

 



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