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<P><B><FONT SIZE=2 FACE="Arial">UNRESTRICTED | ILLIMITÉ</FONT></B>
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<P><FONT SIZE=2 FACE="Arial">Mpich2 Users,</FONT>
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<P><FONT SIZE=2 FACE="Arial">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 SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2069154944)</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2049205848)</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2029256752)</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2029256704)</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2028987040)</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2028987032)</FONT></P>
<P><FONT SIZE=2 FACE="Arial"> [pe:0] **DOTCOMM Error** DOTCOMMI_PACK (dotcommi_pack.c:104[!(( dotcommp_sbuf.data != ((void *)0) ))]) (alloc(dotcommp_sbuf.data)) (2028592456).</FONT></P>
<P><FONT SIZE=2 FACE="Arial">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 SIZE=2 FACE="Arial">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>
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<P><FONT SIZE=2 FACE="Arial">Thanks for your help.</FONT>
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<P><FONT SIZE=2 FACE="Arial">Ben</FONT>
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