[mpich-discuss] Suppressed Output

[SULLIVAN David (AREVA)]

Eduardo,
 
I am more familiar with mcnp5 than x but I think this is still
applicable- For using a single machine it is often better to use the
mcnp input variable "tasks 8" (for your situation), rather than going
through mpiexec. So it would look like:
 
mcnpx tasks 8 i=filename.i o=filename.o
 
If the executable has been built for threading..if it bombs with the
error "multiprocessing is unavailable in this compilation", you will
need to rebuild it for OMP (if you have the source files). Hope this is
helpful-
 
Dave

________________________________

From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Padilla, Eduardo
Antonio
Sent: Wednesday, September 08, 2010 5:13 PM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] Suppressed Output


All,
I recently installed the current version of MPICH2 1.2.1p1 on a 32-bit
XP Pro machine with 8 cores (the machine is 64-bit but the OS is 32).
I'm trying to run MCNPX threading all 8 cores. My command line is as
follows: 
mpiexec -localonly 8 mcnpx i=filename...
 
This ran great exactly twice. However, now when I run it I see MCNPX
start up normally, create the initial files and then:
Dynamic storage = 0 words, 0 bytes. Cp0 = 0.00
Master starting 7 by 1 subtasks 09/03/10 (time)
Master sending static commons...
Master sending dynamic commons...
Master completed initialization broadcasts.
Rendezvous at nps = 1000 # of microtasks = 7 (date time - this is MCNPX
language here)
Rendezvous at nps =***************** of microtasks = 7 (date time - this
is MCNPX talk but confusing to me)
 
At this point, all 8 cores are running full bore in task manager, but
the process gets hung up. The output files are never written or updated
(data dumps don't occur). When I run based on a set number of particle
histories (not based on cpu time), the process seems to work fine. I
assume a simple setting got changed somewhere?
Regards,
Eduardo Padilla
Sandia National Labs
 
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