[mpich-discuss] -channel shm

Jayesh Krishna jayesh at mcs.anl.gov
Thu Oct 1 12:59:51 CDT 2009

 The SHM channel is old (It is already deprecated on unix, it will be
deprecated on windows in the upcoming release). Use the newer Nemesis
channel (-channel nemesis) instead.


From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of dave waite
Sent: Thursday, October 01, 2009 12:43 PM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] -channel shm

Using mpich2 on windows, when we run mpiexec using the -localonly -channel
shm options, we see that all cores spin at all times(100% CPU Usage
History, Windows Task Manager).  Without, the -channel shm option, cores
show cpu activity only when they are actively computing.  Is that a way to
use the -channel shm option and not have the infinite spin limit on the


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