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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">performance, measured as overhead</DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> nemsis : 3 (not precise)</DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> ssm : 52 (1.04p1)</DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"> sock : 550<BR></DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">The performance is good, however, the mpd process creates a huge problem for the same 3 millions lines of code that run without MPI (MPI not even called), they are running 2X slower, if I kill mpd, theyregain their original performance. </DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">I reported a similar mpd slowing down other process problem in Jul/Aug 2006.<BR></DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">tan</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: Rajeev Thakur <thakur@mcs.anl.gov><BR>To: chong tan <chong_guan_tan@yahoo.com><BR>Cc: mpich-discuss@mcs.anl.gov<BR>Sent: Thursday, January 18, 2007 11:38:14 AM<BR>Subject: RE: [MPICH] MPICH2 1.05 MPI_Send & MPI_Recv dropping packages randomly<BR><BR>
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<DIV dir=ltr align=left><SPAN class=571303719-18012007><FONT face=Arial color=#0000ff size=2>Cool. Why don't you use that for now until ssm is fixed. Also, we would like to know how it performs for you compared with ch3:sock and ch3:ssm.</FONT></SPAN></DIV>
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<DIV dir=ltr align=left><SPAN class=571303719-18012007><FONT face=Arial color=#0000ff size=2>Rajeev</FONT></SPAN></DIV>
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<FONT face=Tahoma size=2><B>From:</B> chong tan [mailto:chong_guan_tan@yahoo.com] <BR><B>Sent:</B> Thursday, January 18, 2007 1:28 PM<BR><B>To:</B> Rajeev Thakur<BR><B>Cc:</B> mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> Re: [MPICH] MPICH2 1.05 MPI_Send & MPI_Recv dropping packages randomly<BR></FONT><BR></DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><BR>the test also work with ch3:nemesis.</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">tan</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: Rajeev Thakur <thakur@mcs.anl.gov><BR>To: chong tan <chong_guan_tan@yahoo.com><BR>Cc: mpich-discuss@mcs.anl.gov<BR>Sent: Thursday, January 18, 2007 9:43:37 AM<BR>Subject: RE: [MPICH] MPICH2 1.05 MPI_Send & MPI_Recv dropping packages randomly<BR><BR>
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<DIV dir=ltr align=left><SPAN class=116214217-18012007><FONT face=Arial color=#0000ff size=2>Can you try using the Nemesis channel? Configure with --with-device=ch3:nemesis. That will use shared memory within a node and TCP across nodes and should actually perform better than ssm.</FONT></SPAN></DIV>
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<DIV dir=ltr align=left><SPAN class=116214217-18012007><FONT face=Arial color=#0000ff size=2>Rajeev</FONT></SPAN></DIV>
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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>chong tan<BR><B>Sent:</B> Thursday, January 18, 2007 11:11 AM<BR><B>To:</B> William Gropp<BR><B>Cc:</B> mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> Re: [MPICH] MPICH2 1.05 MPI_Send & MPI_Recv dropping packages randomly<BR></FONT><BR></DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">all the messages are short messages, the shortest being 3 integer (32 bits), the longest 9 integers.</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">I can't send you the code per company policy. There are about 3 million lines of C, C++ and Tcl. MPI is used in an isolated part of the code.</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">I will try sock, sock runs almost 11X slower on this prtiticular machine. On 2.1.04p1, overhead by ssm was 50 sec, and sock's overhead was 520 sec on the failed test.</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">tan</DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: William Gropp <gropp@mcs.anl.gov><BR>To: chong tan <chong_guan_tan@yahoo.com><BR>Cc: mpich-discuss@mcs.anl.gov<BR>Sent: Wednesday, January 17, 2007 6:37:19 PM<BR>Subject: Re: [MPICH] MPICH2 1.05 MPI_Send & MPI_Recv dropping packages randomly<BR><BR>Can you send us the test case? Does it fail with the ch3:sock device? Are the messages short or long?
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<DIV>Bill</DIV>
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<DIV>On Jan 17, 2007, at 7:06 PM, chong tan wrote:</DIV><BR class=Apple-interchange-newline>
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<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">OS : RedHat Enterprise 4, 2.6.9-42.ELsmp</SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">CPU 4 dual core Intel</SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"></SPAN> </DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">the package was built with :</SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">setenv CFLAGS "-m32 -O2"</SPAN><BR style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">setenv CC gcc</SPAN><BR style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">./configure -prefix=/u/cgtan/my_release_dir --with-device=ch3:ssm --enable-fast |& tee configure.log</SPAN><BR style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">-----</SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">the test programs run 5 processes, one master and 4 slaves. Master always recv from slaves and them send to all of them. Randomly, an MPI_Send performed in the master will complete, but the corresponidng MPI_Recv in the targeted slave would not complete, and the who thing hangs. </SPAN></DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"></SPAN> </DIV>
<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">I have a debugging mechanism that attachs a sequence id to all packages sent. The packages are dumped before and after sent, and recv. a message is also dumped on the the pending recv. The sequence id traced OK all the way to the lost package.</SPAN></DIV>
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<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">The same code work fine with 2.1.04p1. it has been tested on test cases longer than 100 million send/recv sequences. any suggestions ?</SPAN></DIV>
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<DIV style="FONT-SIZE: 16px; FONT-FAMILY: times new roman"><SPAN class=Apple-style-span style="FONT-SIZE: 16px; FONT-FAMILY: times new roman">tan</SPAN></DIV>
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