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<DIV><FONT face=新細明體 size=2>Sorry, I don't know what do you mean?</FONT></DIV>
<DIV><FONT face=新細明體 size=2></FONT> </DIV>
<DIV><FONT face=新細明體 size=2>Do you have error mail?</FONT></DIV>
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<DIV style="FONT: 10pt 新細明體">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt 新細明體; font-color: black"><B>From:</B>
<A title=thakur@mcs.anl.gov href="mailto:thakur@mcs.anl.gov">Rajeev Thakur</A>
</DIV>
<DIV style="FONT: 10pt 新細明體"><B>To:</B> <A title=mpich-discuss@mcs.anl.gov
href="mailto:mpich-discuss@mcs.anl.gov">mpich-discuss@mcs.anl.gov</A> </DIV>
<DIV style="FONT: 10pt 新細明體"><B>Sent:</B> Monday, March 15, 2010 1:30 PM</DIV>
<DIV style="FONT: 10pt 新細明體"><B>Subject:</B> Re: [mpich-discuss] MPI I/O SLOW-
possible conflictingwithcommunication....code stuck for ever during IO</DIV>
<DIV><BR></DIV>
<DIV dir=ltr align=left><SPAN class=453103005-15032010><FONT face=Arial
color=#0000ff size=2>Can you send us a small test program that
fails?</FONT></SPAN></DIV><BR>
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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>
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<FONT face=Tahoma size=2><B>From:</B> <A
href="mailto:mpich-discuss-bounces@mcs.anl.gov">mpich-discuss-bounces@mcs.anl.gov</A>
[mailto:mpich-discuss-bounces@mcs.anl.gov] <B>On Behalf Of
</B>hossam<BR><B>Sent:</B> Sunday, March 14, 2010 1:57 PM<BR><B>To:</B> <A
href="mailto:mpich-discuss@mcs.anl.gov">mpich-discuss@mcs.anl.gov</A><BR><B>Subject:</B>
[mpich-discuss] MPI I/O SLOW- possible conflicting withcommunication....code
stuck for ever during IO<BR></FONT><BR></DIV>
<DIV></DIV>Hi,<BR><BR>I think i have a well defined problem i wonder if
someone can give an advice.<BR><BR>I am running an MPI code (MPICH2) on a
linux cluster. <BR><BR>When i run the code with no IO inside the main
runtime loop. It works perfectly fine on any number of processors and nodes.
When i start dumping data during the loop<BR>the code get stuck for ever
after the second or third file. <BR><BR>Everything works perfectly fine on a
single processor though.<BR><BR>Now, to make things clearer: When i use
ROMIO (MPI IO) it got stuck during opining the file (MPI_FILE_OPEN).
<BR><BR>However, i tried regular open(....) at the root processor and then
reducing the data to the root processor and write there. The code got stuck
at the MPI_REDUCE call.<BR><BR>If i eliminated all the processors
communication and just do dump IO (both ways), it runs fine but it slows
down significantly when dumping the data.<BR><BR>I tried on three different
clusters(all linux) and i got the same problem.<BR><BR>I don't want say what
i think is the problem, i don't really know, but if the experts here can
help i will appreciate.<BR><BR> Thanks<BR><BR>
<DIV class=gmail_quote>On Sun, Mar 14, 2010 at 12:50 PM, hossam <SPAN
dir=ltr><<A
href="mailto:hossam.elasrag@gmail.com">hossam.elasrag@gmail.com</A>></SPAN>
wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Hi,<BR><BR>This
is my first post to the mpi-forum. I have a runtime problem related to MPI
using MPICH2. I wonder if this is the correct forum to post my
problem.<BR>Please let me know so i can proceed forward with my problem
details.<BR><BR>Thanks<BR clear=all><BR><BR><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR><BR><BR></BLOCKQUOTE>
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