[mpich-discuss] spawning processes in different cores with mpi_info

[Pavan Balaji]

This is a good idea and should be added into the process manager (it 
currently isn't).  Can you create a ticket for this?

https://trac.mcs.anl.gov/projects/mpich2/newticket

Thanks,

  -- Pavan

On 02/24/2012 09:07 AM, Umit wrote:
> Thank you for your answer.
>
> I am getting the hostnames dynamically(at runtime). To create a file I
> must crate a datastream. I was using it but If I create a stream I am
> loosing too many clock cycles. I am now triing to do it faster.
>
> Isn't it possible without a hostfile? Can't we add more then one
> hostname to MPI_Info object?
>
>
>
> On 24 February 2012 15:48, Rajeev Thakur <thakur at mcs.anl.gov
> <mailto:thakur at mcs.anl.gov>> wrote:
>
>     You can store all the host names in a file and use the info key
>     "hostlist" with the value being the name of the file.
>
>     On Feb 24, 2012, at 6:38 AM, Umit wrote:
>
>      > Hello all,
>      >
>      > Is there any comprehensive documentation about mpich2?
>      >
>      > I want to learn which keys are allowed in MPI_comm_spawn. Is not
>     there any documentation about these things?
>      >
>      > I want to create more then one process at once on specific hosts.
>      >
>      > If I run the programm with following code I can create two
>     processes on core01
>      >     np=2;
>      >     MPI_Info_create( &info2 );
>      >     MPI_Info_set(info2, "host","core01");
>      >     MPI_Comm_spawn( "/demo2/./demo2", MPI_ARGV_NULL, np, info2,
>     0, MPI_COMM_WORLD, &intercomm, errcodes );
>      >
>      > But I want to create each process in other core? Is is possible?
>     I tried adding more then one core to info2 but it did not work :
>      >     MPI_Info_set(info2, "host","core01,core02");
>      >
>      > I got he following error: Fatal error in MPI_Comm_spawn: Other
>     MPI error, error stack
>      >
>      > Can somebody help me please?
>      >
>      > Kind Regards,
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji