[mpich-discuss] Suppressed Output

[Jayesh Krishna]

Hi,
 >> ...but the process gets hung up

 Are you sure that the processes are hung (Nemesis continuously polls for shared memory communication)? How long did you wait for results ? Can you try the different channels in MPICH2 explicitly and see if the results are similar ?

 To try the sock channel, mpiexec -channel sock -localonly 8 mcnpx i=filename… , and to try the newer nemesis channel, mpiexec -channel nemesis -localonly 8 mcnpx i=filename… .

 Can you try the 1.3b1 release and see if it works for you (http://www.mcs.anl.gov/research/projects/mpich2/downloads/index.php?s=downloads)?
 Unfortunately I am not an MCNPX expert and cannot debug the MCNPX logs for you.

Regards,
Jayesh

----- Original Message -----
From: "Eduardo Antonio Padilla" <eapadil at sandia.gov>
To: mpich-discuss at mcs.anl.gov
Sent: Wednesday, September 8, 2010 4:59:30 PM GMT -06:00 US/Canada Central
Subject: Re: [mpich-discuss] Suppressed Output





Thanks Dave – I think the tasks option is only available with PVM versions, which I do not have built. I’d like to avoid learning how to do this (the reason for me simply downloading the beta MPI version and installing mpich2). Hopefully, there’s a simple way to correct the cpu time error. 

-Eduardo 





From: mpich-discuss-bounces at mcs.anl.gov [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of SULLIVAN David (AREVA) 
Sent: Wednesday, September 08, 2010 3:50 PM 
To: mpich-discuss at mcs.anl.gov 
Subject: Re: [mpich-discuss] Suppressed Output 



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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