We added a similar fix in https://github.com/pmodels/mpich/pull/2788. This was included in the MPICH 3.3 release. Ken On 6/4/19 11:27 PM, Xiaopeng Duan via discuss wrote:

Hi, MPICH experts,

We are working on a dynamic master-worker flow using mpi_comm_connect/mpi_com_accept. In some cases when the total number of worker process is large, they may get the same kvs_name and confuse the internal group identifiers. This was traced to the naming convention in HYD_pmcd_pmi_allocate_kvs() that considers only process id, while two processes on different machines may have the same pid. I tried to add host name (from unistd.h>gethostname) to the name, i.e. 'kvs_HOSTNAME_PID_pgid', then everything is working fine in our testing.

So I'm wondering if this change is safe (we may need it for our release) and if it would go into the official MPICH release some time.

Thank you very much.

Xiaopeng

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