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Subject: Re: [OMPI users] how to make a process start and then join a MPI group
From: Aurélien Bouteiller (bouteill_at_[hidden])
Date: 2008-07-26 17:58:21


MPI_Intercomm_merge is what you are looking for.

Aurelien
Le 26 juil. 08 à 13:23, Mark Borgerding a écrit :

> Okay, so I've gotten a little bit closer.
>
> I'm using MPI_Comm_spawn to start several children processes. The
> problem is that the children are in their own group, separate from
> the parent (just the like the documentation says). I want to merge
> the children's group with the parent group so I can efficiently Send/
> Recv data between them..
>
> Is this possible?
>
> Plan B: I guess if there is no elegant way to merge all those
> processes into one group, I can connect sockets and make intercomms
> to talk from the parent directly to each child.
>
> -- Mark
>
>
>
> Mark Borgerding wrote:
>> I am writing a code module that plugs into a larger application
>> framework. That framework loads my code module as a shared object.
>> So I do not control how the first process gets started, but I still
>> want it to be able to start and participate in an MPI group.
>>
>> Here's roughly what I want to happen ( I think):
>>
>> framework app running (not under my control)
>> -> framework loads mycode.so shared object into its process
>> -> mycode.so starts mpi programs on several hosts
>> (e.g. via system call to mpiexec )
>> -> initial mycode.so process participates in the group
>> he just started (e.g. he shows up in MPI_Comm_group, can use
>> MPI_Send, MPI_Recv, etc. )
>>
>> Can this be done?
>> I am running under Centos 5.2
>>
>> Thanks,
>> Mark
>>
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>
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