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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009>Hi,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009> If you are starting your program without mpiexec
the default channel is picked. You can control the channel used by the library
using the "MPICH2_CHANNEL" environment variable.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009> Please set MPICH2_CHANNEL environment variable as
follows (and then run your MPI program),</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009>1) To use the Nemesis channel,
MPICH2_CHANNEL=nemesis</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009>2) To use the multithreaded channel,
MPICH2_CHANNEL=mt</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009> The default channel (MPICH2_CHANNEL=sock) is the
single threaded sock channel.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009> Let us know if it works for
you.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009>Regards,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=320011514-25092009>Jayesh</SPAN></FONT></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> Lubomir Radev [mailto:lubomirr@yahoo.com]
<BR><B>Sent:</B> Tuesday, September 22, 2009 11:05 AM<BR><B>To:</B> Jayesh
Krishna<BR><B>Cc:</B> mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> Re:
[mpich-discuss] MPI_THREAD_MULTIPLE<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV
style="FONT-FAMILY: 'times new roman', 'new york', times, serif; FONT-SIZE: 12pt">
<DIV>I will do that, but in the meantime, could you run your own test code below
directly, not using mpiexec, and see the result. For me, it's returning
MPI_THREAD_SINGLE - is that how it's supposed to be, i.e. the thread-safe
support can only be enabled if the application is run via mpiexec? </DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><BR>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><FONT
size=2 face=Tahoma>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Jayesh Krishna
<jayesh@mcs.anl.gov><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
Lubomir Radev <lubomirr@yahoo.com><BR><B><SPAN
style="FONT-WEIGHT: bold">Cc:</SPAN></B> mpich-discuss@mcs.anl.gov<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, September 22, 2009 8:21:44
AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [mpich-discuss]
MPI_THREAD_MULTIPLE<BR></FONT><BR>
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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=501422015-22092009>Hi,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=501422015-22092009> Can you send us a test program
?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=501422015-22092009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=501422015-22092009>Regards,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=501422015-22092009>Jayesh</SPAN></FONT></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> Lubomir Radev [mailto:lubomirr@yahoo.com]
<BR><B>Sent:</B> Tuesday, September 22, 2009 2:27 AM<BR><B>To:</B> Jayesh
Krishna; mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> Re: [mpich-discuss]
MPI_THREAD_MULTIPLE<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV
style="FONT-FAMILY: 'times new roman', 'new york', times, serif; FONT-SIZE: 12pt">
<DIV>This works for me too, returning MPI_THREAD_MULTIPLE, but only when started
via mpiexec.</DIV>
<DIV><BR></DIV>
<DIV>However, I need to launch my worker processes programmatically by using
MPI_Comm_spawn_multiple(). That's necessitated by the nature of my app - it's
actually a library that clients will be linking against. So the client process
has to spawn workers and communicate with them, which works just fine from one
thread and fails with two. And if I use MPI_Init_thread() from the client/master
process (which isn't started by mpiexec), it always returns
MPI_THREAD_SINGLE.</DIV>
<DIV><BR></DIV>
<DIV>Should I try to pack all of my MPI communications in one thread or can you
suggest a solution other than mpiexec for multiple threads? Perhaps I could
somehow perform the same thread support initialization that mpiexec apparently
does internally?</DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><BR></DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">Thanks
very much.</DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><BR>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><FONT
size=2 face=Tahoma>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Jayesh Krishna
<jayesh@mcs.anl.gov><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
mpich-discuss@mcs.anl.gov<BR><B><SPAN style="FONT-WEIGHT: bold">Cc:</SPAN></B>
Lubomir Radev <lubomirr@yahoo.com><BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, September 21, 2009 9:04:17
AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [mpich-discuss]
MPI_THREAD_MULTIPLE<BR></FONT><BR>
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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009>Hi,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009> Are you launching your MPI job using the
"-channel" option of mpiexec (mpiexec -n 2 -channel nemesis
thread_multiple_test.exe)?</SPAN></FONT><FONT color=#0000ff size=2
face=Arial><SPAN class=408565815-21092009> A simple MPI program (see
below) that queries for the thread level support returns
MPI_THREAD_MULTIPLE for me.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009>=========== Thread multiple test
===================</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009><FONT color=#0000ff size=2><FONT color=#0000ff
size=2></FONT></FONT>
<P><FONT color=#0000ff size=2><FONT color=#0000ff
size=2>#include</FONT></FONT><FONT color=#000000 size=2> </FONT><FONT
color=#a31515 size=2><FONT color=#a31515
size=2><iostream></FONT></FONT></P><FONT color=#a31515 size=2><FONT
color=#a31515 size=2></FONT></FONT><FONT color=#0000ff size=2><FONT
color=#0000ff size=2></FONT></FONT>
<P><FONT color=#0000ff size=2><FONT color=#0000ff
size=2>#include</FONT></FONT><FONT color=#000000 size=2> </FONT><FONT
color=#a31515 size=2><FONT color=#a31515 size=2>"mpi.h"</FONT></FONT></P><FONT
color=#a31515 size=2><FONT color=#a31515 size=2></FONT></FONT><FONT
color=#0000ff size=2><FONT color=#0000ff size=2></FONT></FONT>
<P><FONT color=#0000ff size=2><FONT color=#0000ff size=2>int</FONT></FONT><FONT
color=#000000 size=2> main(</FONT><FONT color=#0000ff size=2><FONT color=#0000ff
size=2>int</FONT></FONT><FONT color=#000000 size=2> argc, </FONT><FONT
color=#0000ff size=2><FONT color=#0000ff size=2>char</FONT></FONT><FONT
size=2><FONT color=#000000> *argv[])</FONT></FONT></P><FONT size=2>
<P>{</P></FONT>
<P><FONT color=#0000ff size=2><FONT color=#0000ff size=2>int</FONT></FONT><FONT
size=2> provided;</FONT></P><FONT size=2>
<P>provided = MPI::Init_thread(MPI_THREAD_MULTIPLE);</P></FONT>
<P><FONT color=#0000ff size=2><FONT color=#0000ff size=2>if</FONT></FONT><FONT
size=2>(provided == MPI_THREAD_MULTIPLE){</FONT></P><FONT size=2></FONT>
<P><FONT size=2>std::cout << </FONT><FONT color=#a31515 size=2><FONT
color=#a31515 size=2>"Thread multiple supported"</FONT></FONT><FONT size=2>
<< std::endl;</FONT></P><FONT size=2>
<P>}</P></FONT>
<P><FONT color=#0000ff size=2><FONT color=#0000ff size=2>else</FONT></FONT><FONT
size=2>{</FONT></P><FONT size=2></FONT>
<P><FONT size=2>std::cout << </FONT><FONT color=#a31515 size=2><FONT
color=#a31515 size=2>"Thread multiple NOT supported"</FONT></FONT><FONT size=2>
<< std::endl;</FONT></P><FONT size=2>
<P>}</P>
<P>MPI::Finalize();</P>
<P>}</P>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009>=========== Thread multiple test
===================</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009>Regards,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=408565815-21092009>Jayesh</SPAN></FONT></DIV></FONT></SPAN></FONT></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> mpich-discuss-bounces@mcs.anl.gov
[mailto:mpich-discuss-bounces@mcs.anl.gov] <B>On Behalf Of </B>Lubomir
Radev<BR><B>Sent:</B> Sunday, September 20, 2009 7:23 PM<BR><B>To:</B>
mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> Re: [mpich-discuss]
MPI_THREAD_MULTIPLE<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV
style="FONT-FAMILY: 'times new roman', 'new york', times, serif; FONT-SIZE: 12pt">
<DIV>Yes. I was using 1.0.8p1 originally, but after your suggestion got 1.1.1p1
and the problem persists.</DIV>
<DIV><BR></DIV>
<DIV>I could reduce my code to a test case exhibiting the issue, but I need to
understand why MPI_Init_thread() won't provide me with MPI_THREAD_MULTIPLE
support and always returns MPI_THREAD_SINGLE regardless of the channel
configuration. I need to get that working first so my multi-threaded code can
assume it operates in a correctly initialized environment and can legitimately
call into MPICH2 simultaneously from more than one thread.</DIV>
<DIV><BR></DIV>
<DIV>I'm using Boost.MPI wrapper (and Boost.Thread), but that shouldn't
matter.</DIV>
<DIV><BR></DIV>
<DIV>Thanks</DIV>
<DIV><BR></DIV>
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">
<DIV
style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><FONT
size=2 face=Tahoma>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Jayesh Krishna
<jayesh@mcs.anl.gov><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
mpich-discuss@mcs.anl.gov<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B>
Friday, September 18, 2009 8:42:38 AM<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [mpich-discuss]
MPI_THREAD_MULTIPLE<BR></FONT><BR>
<P><FONT size=2>Hi,<BR><SPAN><SPAN><SPAN> Are you trying the latest stable
release, 1.1.1p1, of MPICH2 (<A
href="http://www.mcs.anl.gov/research/projects/mpich2/downloads/index.php?s=downloads"
target=_blank>http://www.mcs.anl.gov/research/projects/mpich2/downloads/index.php?s=downloads</A>)
?</SPAN></SPAN></SPAN><BR> Can you send us a test program
?<BR><BR>Regards,<BR>Jayesh<BR><BR>-----Original Message-----<BR>From:
mpich-discuss-bounces@mcs.anl.gov [<A
href="mailto:mpich-discuss-bounces@mcs.anl.gov" rel=nofollow target=_blank
ymailto="mailto:mpich-discuss-bounces@mcs.anl.gov">mailto:mpich-discuss-bounces@mcs.anl.gov</A>]
On Behalf Of Lubomir Radev<BR>Sent: Thursday, September 17, 2009 10:08 PM<BR>To:
mpich-discuss@mcs.anl.gov<BR>Subject: [mpich-discuss]
MPI_THREAD_MULTIPLE<BR><BR>Hey guys,<BR><BR>I need to call into the thread-safe
version of MPICH2 so I tried to initialize with MPI_Init_thread() and
MPI_THREAD_MULTIPLE, but no matter how I configured the channels on my nodes -
tried both mt and nemesis - that function returns MPI_THREAD_SINGLE as provided
thread support.<BR><BR>I'm using 1.0.8p1 on Windows if that matters. Installed
from the provided MSI binary. Perhaps I need to build from sources, configuring
it with thread support?<BR><BR>Thanks<BR></FONT></P></DIV></DIV>
<DIV></DIV></DIV></DIV></DIV>
<DIV></DIV></DIV></DIV></DIV>
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