[mpich-discuss] Multiple mpds launched by one user on same machine

[Rajeev Thakur]

You can use the "-1" option to mpdboot.

Rajeev 

> -----Original Message-----
> From: mpich-discuss-bounces at lists.mcs.anl.gov 
> [mailto:mpich-discuss-bounces at lists.mcs.anl.gov] On Behalf Of 
> Volker Amedick
> Sent: Tuesday, October 28, 2008 10:41 AM
> To: mpich-discuss at mcs.anl.gov
> Cc: volker.amedick at siemens.com
> Subject: [mpich-discuss] Multiple mpds launched by one user 
> on same machine
> 
> Hi,
> 
> I have an issue with MPICH2 which I cannot resolve on my own. 
> In our computer environment we have a multi-processor compute 
> grid (SMP). The access to the compute grid is controlled by a 
> queueing system called Condor which also manages the CPU 
> resources of the grid. IT allows access to the compute grid 
> only through Condor. 
> 
> When I now want to run a program using MPICH2 I submit a 
> shell script to Condor that (1) launches a ring of mpds on 
> the CPUs provided by Condor, (2) launches the program which 
> uses MPICH2. When the program finishes, the shell script 
> finishes also. As the script has finished the ring of mpds is 
> stopped by Condor. This is working fine as long as I run only 
> one job on the compute grid. When I submit a second job, I am 
> not able to launch a 2nd ring of mpds on the same computer 
> but need to use the existing ring of the 1st job. 
> Unfortunately, when the 1st job has finished, its ring of 
> mpds is stopped by Condor causing the 2nd job to fail as it 
> lost connection to the mpds.
> 
> To circumvent this issue I suggested to IT to run an mpd as 
> root allowing other users to access root's ring of mpds. But 
> IT declined as this might allow users to bypass Condor. Is 
> there an alternative possibility to launch multiple rings of 
> mpds on the same computer by the same user. And if so, how 
> does a MPICH2 program then know to which ring of mpds it belongs.
> 
> Any help is highly appreciated. Thanks in advance,
> Volker
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