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

[Rajeev Thakur]

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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