If you wanted to bind each process to 1 core in a round-robin fashion, you would use mpiexec.hydra -ppn 5 -bind-to core Or if your cores have 1 hwthread each, you could use mpiexec.hydra -ppn 5 -bind-to rr To bind all processes to a single core, you would need to specify a user binding, such as mpiexec.hydra -ppn 5 -bind-to user:1,1,1,1,1 That tells hydra to bind each of the 5 processes to core 1. However there is a bug in hydra that will cause an error in the second example when the number of bindings specified is > the number of hwthreads on your machine. It should be fixed in the upcoming mpich 3.1 release. We will also be adding some more process binding examples to the mpich wiki in the near future. Ken On 01/03/2014 01:49 PM, Z.Rahmani wrote:

To whom it may concern,

I have an MPI code with 5 ranks and I use a 4-core processor, I want to process my code on the machine with every probable state of assigning each process on each core of CPU. I mean , for example , one time all of process run on 1core, next time each process run on each core of 4-core CPU and so on.

I used " mpiexec.hydra -ppn 5 -bind-to core:4" to run first process on first core, 2nd process on 2nd core, 3rd process on 3rd core , ....

It would be appreciated if correct me.

Kind Regards, Zahra

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