Hi, Hui,

Thanks for your response, I have already read through the docs that you said. It's very useful.

although I did some research still have some questions:

IMHO, there are 2 possible ways to do dynamic scheduling of cpu cores:

1. using mpi_comm_spawn to spawn a new hydra_pmi_proxy on a different port

or using mpi_comm_spawn_multiple to spawn new processes on the same port

but my question is that how to start the new processes on a remote machine, using farm resource manager(qsub,bsub,etc)? Is there a reserved keyword in the MPI_info that can qualify for this function?

2. using mpi_comm_connect to connect an already started mpi application to connect to another mpi application, but I didn't find some useful testcases yet. Do you know if this way is possible?

Thanks,

Shuwei

On Thu, Nov 8, 2018 at 4:52 PM Zhou, Hui <zhouh@anl.gov> wrote:

I am by far not an expert on MPI dynamic process at this point. I will point you to the MPI standards https://www.mpi-forum.org/docs/, in particular, chapter 10. MPICH implements most of the standards. Try follow the standards to see what you can do. If you hit specific problem, post back here and some one will help you.

Cheers,

—

Hui Zhou

On Nov 6, 2018, at 5:20 PM, Shuwei Zhao via discuss <discuss@mpich.org> wrote:

Hi, Experts,

I have a question about if mpich can do dynamically allocate/schedule/kill process on the runtime? If that’s doable, how can we do that?

Let’s see an example:

qsub -P my_queue -pe mpi 8 mpiexec my_exe

Distribute mpich application on 8 processes each on a single machine. During the application runtime, can we dynamically (allocate & start)/(remove & kill) one process and (add to)/(delete from) the current communication group ?

Appreciate your help ahead!

Thanks,

Shuwei

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