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<TITLE>Large Message Sizes with Mpich2 V 1.0.8</TITLE>
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<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2><B>UNRESTRICTED | ILLIMITÉ </B><BR><BR>Rajeev,</FONT></SPAN></DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2>Similar problems were experienced by other MCNP users. The feedback
that I received from a user was to re-compile the code with a modified version
of mpich2 in order to handle large messages. I browsed the documentation
for mpich2 and haven't found any limitation that would explain why my runs crash
when I use large models.</FONT></SPAN></DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff size=2>Since
yesterday I modified the MCNP source code for debugging purposes and realized
that the crash happens when the send buffer is being initialized. I
assume that MCNP is trying to send out large amount of information and requires
significant resources on the system. The amount of memory consumed by
the system is larger than the RAM + swap space.</FONT></SPAN></DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff size=2>I will
try to increase the swap space on my system and hopefully this will help me out
to narrow down the problem.</FONT></SPAN></DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2>Thanks</FONT></SPAN></DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=688013218-17032009><FONT face=Arial color=#0000ff
size=2>Benoit</FONT></SPAN></DIV>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
mpich-discuss-bounces@mcs.anl.gov
[mailto:mpich-discuss-bounces@mcs.anl.gov]<B>On Behalf Of </B>Rajeev
Thakur<BR><B>Sent:</B> March 16, 2009 5:03 PM<BR><B>To:</B>
mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> Re: [mpich-discuss] Large Message
Sizes with Mpich2 V 1.0.8<BR><BR></FONT></DIV>
<DIV dir=ltr align=left><SPAN class=078170221-16032009><FONT face=Arial
color=#0000ff size=2>What maximum message predefined message size in MPICH2
are you refering to?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=078170221-16032009><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=078170221-16032009><FONT face=Arial
color=#0000ff size=2>Rajeev</FONT></SPAN></DIV><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> mpich-discuss-bounces@mcs.anl.gov
[mailto:mpich-discuss-bounces@mcs.anl.gov] <B>On Behalf Of </B>Arsenault,
Benoit<BR><B>Sent:</B> Monday, March 16, 2009 3:21 PM<BR><B>To:</B>
mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> [mpich-discuss] Large Message
Sizes with Mpich2 V 1.0.8<BR></FONT><BR></DIV>
<DIV></DIV><!-- Converted from text/rtf format -->
<P><B><FONT face=Arial size=2>UNRESTRICTED | ILLIMITÉ</FONT></B> </P>
<P><FONT face=Arial size=2>Mpich2 Users,</FONT> </P>
<P><FONT face=Arial size=2>I compiled the 64-bit mpich2 Version 1.0.8 with
MCNP5 Version 1.40 on Linux RedHat. I can run reasonable size problems
without any difficulties, but the code crashes when I use large
models. The error message that I get is listed below and relates to a
subroutine in MCNP5.</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2069154944)</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2049205848)</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2029256752)</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2029256704)</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2028987040)</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2028987032)</FONT></P>
<P><FONT face=Arial size=2> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK
(dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))])
(alloc(dotcommp_sbuf.data)) (2028592456).</FONT></P>
<P><FONT face=Arial size=2>I browsed the MCNP Users' group and similar
problems have been encountered where users had to re-compile mpich2 with a
change to increase the maximum size of a message. I couldn't find a
way to go beyond the maximum size of a message pre-defined in mpich2 V
1.0.8.</FONT></P>
<P><FONT face=Arial size=2>Would anyone knows if mpich2 V 1.0.8 has the same
limitations in terms of maximum message size, and if this can be
resolved?</FONT></P><BR>
<P><FONT face=Arial size=2>Thanks for your help.</FONT> </P><BR>
<P><FONT face=Arial size=2>Ben</FONT> </P><BR><BR><BR>
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