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Subject: Re: [OMPI users] One additional (unwanted) process when using dynamical process management
From: Evgeniy Gromov (Evgeniy.Gromov_at_[hidden])
Date: 2009-01-21 13:30:27


Dear Ralph,

Thanks for your reply.
I encountered this problem using openmpi-1.2.5,
on a Opteron cluster with Myrinet-mx. I tried for
compilation of Global Arrays different compilers
(gfortran, intel, pathscale), the result is the same.

As I mentioned in the previous message GA itself works
fine, but the application which uses it doesn't work
correctly if it runs on several nodes. If it runs on
one node with several cores everything is fine. So I
thought that the problem might be in this additional
process.

Should I try to use the latest 1.3 version of openmpi?

Best,
Evgeniy

Ralph Castain wrote:
> Not that I've seen. What version of OMPI are you using, and on what type
> of machine/environment?
>
>
> On Jan 21, 2009, at 11:02 AM, Evgeniy Gromov wrote:
>
>> Dear OpenMPI users,
>>
>> I have the following (problem) related to OpenMPI:
>> I have recently compiled with OPenMPI the new (4-1)
>> Global Arrays package using ARMCI_NETWORK=MPI-SPAWN,
>> which implies the use of dynamic process management
>> realised in MPI2. It got compiled and tested successfully.
>> However when it is spawning on different nodes (machine) one
>> additional process on each node appears, i.e. if nodes=2:ppn=2
>> then on each node there are 3 running processes. In the case
>> when it runs just on one pc with a few cores (let say nodes=1:ppn=4),
>> the number of processes exactly equals the number of cpus (ppn)
>> requested and there is no additional process.
>> I am wondering whether it is normal behavior. Thanks!
>>
>> Best regards,
>> Evgeniy
>>
>>
>>
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>
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-- 
_______________________________________
Dr. Evgeniy Gromov
Theoretische Chemie
Physikalisch-Chemisches Institut
Im Neuenheimer Feld 229
D-69120 Heidelberg
Germany
Telefon: +49/(0)6221/545263
Fax: +49/(0)6221/545221
E-mail: evgeniy_at_[hidden]
_______________________________________