[mpich-discuss] How to make a non-MPI process to become a MPI process of MPI_COMM_WORLD?

[Huiwei Lu]

You may take a look at MPI_Comm_accept and MPI_Comm_connect, which will
connect a new client process to a server process. See Chap. 10 of MPI 3.0
standard (www.mpi-forum.org/docs/mpi-3.0/mpi30-report.pdf) for a detail
example.

--
Huiwei Lu
Postdoc Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
http://www.mcs.anl.gov/~huiweilu/

On Thu, Jan 22, 2015 at 9:41 AM, haozi <yidanyiji at 163.com> wrote:

> Hi, guys.
>
> This web page (
> http://wiki.mpich.org/mpich/index.php/PMI_v2_Design_Thoughts) says:
>               *Singleton init.* This is the process by which a program
> that was not started with mpiexec can *become an MPI process *and make
> use of all MPI features, including MPI_Comm_spawn, needs to be designed and
> documented, with particular attention to the disposition of standard I/O.
> Not all process managers will want to or even be able to create a new
> mpiexec process, so this needs to be negotiated. Similarly, the dispostion
> of stdio needs to be negotiated between the singleton process and the
> process manager. To address these issues, a new singleton init protocol has
> been implemented and tested with the gforker process manager.
>
> I am very interested in this function.
> Can this function solve the following question:
>               At beginning, the MPI job uses the mpiexec commond to start
> three MPI processes. That is to say, there are three MPI processes in
> MPI_COMM_WORLD. At some time, the job find itself to need another MPI
> process to cooperate the three MPI processes. So the question is: Could PMI
> help an non-MPI process to become a MPI process of the current
> MPI_COMM_WORLD? That is to say, Could the non-MPI process use the PMI
> function to become a member process of the current MPI job which would have
> FOUR MPI processes in MPI_COMM_WORLD?
>
> Is there some method to solve question?
> Is anybody have some example?
>
> Thandks!!!
>
>
>
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