MPI Rank Binding

HPCS — Tue, 19 Aug 2014 21:43:55 GMT

Hello all,

Intel MPI 4.1.3 on RHEL6.4: trying to bind ranks in two simple fashions:(a) 2 ranks to the same processor socket and (b) 2 ranks to different processor sockets.

Looking at the Intel MPI Reference Manual (3.2. Process Pinning pp.98+), we should be able to use options in mpiexec.hydra when the hostfile points to the same host

-genv I_MPI_PIN 1  -genv I_MPI_PIN_PROCESSOR_LIST all:bunch

-genv I_MPI_PIN 1  -genv I_MPI_PIN_PROCESSOR_LIST all:scatter

Unfortunately, the "scatter" option STILL binds the MPI ranks to the same socket.

Should I be using the "I_MPI_PIN_DOMAIN" instead?

Any sugestions?

Thanks, Michael

Can you try using these

drMikeT — Tue, 19 Aug 2014 22:38:02 GMT

Can you try using these options:

(a)

"-genv I_MPI_PIN_DOMAIN=core -genv I_MPI_PIN_ORDER=compact"

(b)

"-genv I_MPI_PIN_DOMAIN=core -genv I_MPI_PIN_ORDER=scatter"

topic Can you try using these in Intel® MPI Library

MPI Rank Binding

Can you try using these