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<DIV dir=ltr align=left><SPAN class=156304700-04052008><FONT face=Arial
color=#0000ff size=2>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.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156304700-04052008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=156304700-04052008><FONT face=Arial
color=#0000ff size=2>Rajeev</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=156304700-04052008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> owner-mpich-discuss@mcs.anl.gov
[mailto:owner-mpich-discuss@mcs.anl.gov] <B>On Behalf Of </B>Cavey,
Lester<BR><B>Sent:</B> Saturday, May 03, 2008 3:33 PM<BR><B>To:</B>
mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> RE: [mpich-discuss] Are there
limits to MPICH2 Jobs?<BR></FONT><BR></DIV>
<DIV></DIV>
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<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Ibrahim,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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 face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">I'm sure the ANL guys
can give you more advice, besides just trying the ulimit
command.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Lester</SPAN></FONT><o:p></o:p></P></DIV>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; 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></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<P><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hello,</SPAN></FONT>
<o:p></o:p></P>
<P><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; 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 face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; 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 face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Your help would be greatly
appreciated.</SPAN></FONT> <o:p></o:p></P>
<P><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,</SPAN></FONT> <BR><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Ibrahim
Attieh</SPAN></FONT> <o:p></o:p></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
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