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<title>Are there limits to MPICH2 Jobs?</title>
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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Ibrahim,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>I'm sure the ANL guys can give you more
advice, besides just trying the ulimit command.<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Lester</span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
owner-mpich-discuss@mcs.anl.gov [mailto:owner-mpich-discuss@mcs.anl.gov] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Attieh, Ibrahim<br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, May 03, 2008 12:03
PM<br>
<b><span style='font-weight:bold'>To:</span></b> mpich-discuss@mcs.anl.gov<br>
<b><span style='font-weight:bold'>Subject:</span></b> [mpich-discuss] Are there
limits to MPICH2 Jobs?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hello,</span></font>
<o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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?</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Your
help would be greatly appreciated.</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks,</span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Ibrahim
Attieh</span></font> <o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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