[mpich-discuss] MPICH2 mpiexec console window on XP?

[Jayesh Krishna]

Hi,
 The new behaviour that you see is due to the support for "Singleton Init"
processes that was added in 1.0.7 (It is an expected behaviour). Currently
there is no way to "turn off" the feature.
 You can start an MPI process without the use of a process manager by
specifying the PMI environment variables by hand (After the PMI env
variables are set the MPI library uses the values provided and does not try
to connect to the existing process manager, smpd, using the job launcher,
mpiexec.).
 
########### PMI vars to be set for single process MPI jobs with no PM
###########
set PMI_ROOT_HOST=%COMPUTERNAME%

set PMI_ROOT_PORT=9222

set PMI_ROOT_LOCAL=1

set PMI_RANK=1

set PMI_SIZE=1

set PMI_KVS=mpich2

#######################################################################
  Please note that you should unset the variables before running other MPI
jobs.
  We will fix our code in the next release so that users don't see the
console window of mpiexec when running their applications (GUI apps). For
now, please follow the instructions above to avoid automatic launching of
the job launcher.
 
(PS: This support allows a singleton init MPI process (MPI process started
without a job launcher)  to function as a normal MPI process. eg: Without
this support a singleton init MPI process cannot spawn other MPI processes
(MPI_Comm_spawn()).
 
Regards,
Jayesh

  _____  

From: owner-mpich-discuss at mcs.anl.gov
[mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Raymond L Swartz
Sent: Monday, April 14, 2008 4:25 PM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] MPICH2 mpiexec console window on XP?



Hi, 

I've just updated to MPICH2 1.0.7 for a project we have here (which has been
running with the previous version just fine) and notice some new behavior. 

When the job starts up now, in addition to the standard GUI we expect, we
are seeing a 'console ' window with the title C:/Program
Files/MPICH2/bin/mpiexec.exe. 

This window does not show up if we launch the executable as 'mpiexec
-localonly 2 <executable>'.  It only appears if we launch the executable
without the mpiexec invocation '<executable>' (nominally, to run as a
single-process job). 

This is new behavior.  Previously we never saw this window.  The console
window is blank, and nothing appears in it. 

Is there a compile-time way to turn it off? 

If it matters, we are building the application in VC++, and using Qt4 as the
GUI library. 

Thanks, 
Ray Swartz 
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