From: Putchong Uthayopas <pu@nontri.ku.ac.th>
Newsgroups: comp.parallel.mpi
Subject: Re: Spawning processes on LAM and/or MPICH
Date: Mon, 28 Sep 1998 22:49:05 +0700
Organization: Parallel Research Group, Kasetsart University
Message-Id: <360FAFF0.6C1018E7@nontri.ku.ac.th>
References: <3609FB7E.80A9B414@unex.es>
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Hi,

As far as I know, MPICH does not support dynamic process creation specifed
in MPI2 standard yet. So, no MPI_comm_spawn in mpich.

Putchong

Juan Hernández wrote:

> Hi all,
>
> I am not an expert on MPI and perhaps my question may seem to be a bit
> silly.
>
> One of my students is building a concurrent object oriented language
> free of "known" inheritance anomalies on top of MPI.
>
> One of the basic operations we need is the dynamic creation of (objects)
> processes and to be able to communicate with such processes.
>
> I have tried both LAM and MPICH, and I found several some problems:
>
> 1. LAM
>
> MPI_Spawn runs well on my cluster of Linux, but I was unable to stablish
> communication with siblings of a process. First, I tried
> MPI_intercomm_merge, but it blocks in new spawns.
>
> Having into account that a process is identified as a pair
> (communicator, rank), we tried to pass this structure as a message for
> communicating dynamically created processes. But, LAM implementation of
> communicators are pointers to a structure --> this idea cannot be
> applied on clusters.
> Then, I switch to MPICH as it defines communicators as integers.
>
> 2. MPICH
> But when we tried MPICH, the function MPI_Comm_Spawn is not included on
> any of the libraries. The prorotype of the function appears in one of
> the include files but is missing the source code and, consequently, it
> does not appear in the generated library.
>
> Does anybody of you provide me some suggestion?
>
> Thanks in advance
> Juan
>
> --
> ********************************************
> Prof. Juan Hernandez
> Extremadura University
> Dpto. Informática
> Campus Universitario, s/n
> 10.071 - Caceres
> SPAIN
>
> Phone: +34 27 257257   Fax: +34 27 257203
> Email: juanher@unex.es
> ********************************************
>

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