Hi Josef, I am not familiar with MPICH_PORT_RANGE but I think you can experiment how many ports does each process need. For starters, you can probably estimate a minimum of 6 ports per process. There was an old post about MPICH_PORT_RANGE but I think the suggestion is still valid today. http://lists.mcs.anl.gov/pipermail/mpich-discuss/2006-July/001485.html Best regards, -- Huiwei On Tue, Apr 14, 2015 at 6:11 AM, HEINZ Josef (AREVA) <[email protected]> wrote:

Hello together,

I have to restrict the port range with MPIEXEC _PORT_RANGE. Does anyone know how many ports are necessary to establish a communication between two hosts? On host1 only one process and on host2 two processes are running.

Thank you very much.

Best regards

Josef

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