Hi John, This looks like a bug. Thanks for reporting. I'll put together a fix shortly. Ken On 05/24/2016 08:05 AM, Low, John J. wrote:

Mpich discussion group,

I would like to use hydra environment variables to bind threads to cores. I am using hydra 3.2 with mvapich2 version 2.2b_psm built with intel 15.0.

I have a simple program to print out the cpu affinity for each process which I have used to test process binding. I have included the output of this program below.

[jlow@blogin2 hybrid_hello]$ HYDRA_BINDING=socket mpirun -np 4 a.out Hello from node blogin2, core 0-15; AKA rank 3, thread 0 Hello from node blogin2, core 0-15; AKA rank 0, thread 0 Hello from node blogin2, core 0-15; AKA rank 2, thread 0 Hello from node blogin2, core 0-15; AKA rank 1, thread 0 [jlow@blogin2 hybrid_hello]$ mpirun -bind-to core:2 -np 4 a.out Hello from node blogin2, core 4,5; AKA rank 2, thread 0 Hello from node blogin2, core 6,7; AKA rank 3, thread 0 Hello from node blogin2, core 0,1; AKA rank 0, thread 0 Hello from node blogin2, core 2,3; AKA rank 1, thread 0 [jlow@blogin2 hybrid_hello]$ mpirun -bind-to socket -np 4 a.out Hello from node blogin2, core 8-15; AKA rank 3, thread 0 Hello from node blogin2, core 0-7; AKA rank 0, thread 0 Hello from node blogin2, core 0-7; AKA rank 2, thread 0 Hello from node blogin2, core 8-15; AKA rank 1, thread 0 [jlow@blogin2 hybrid_hello]$ HYDRA_BINDING=socket mpirun -np 4 a.out Hello from node blogin2, core 0-15; AKA rank 3, thread 0 Hello from node blogin2, core 0-15; AKA rank 1, thread 0 Hello from node blogin2, core 0-15; AKA rank 2, thread 0 Hello from node blogin2, core 0-15; AKA rank 0, thread 0

It appears that hydra is ignoring my environmental variables. How can I use environmental variables to bind processes to cores with hydra?

Thanks,

John J. Low Principal Computational Science Specialist Computing, Environment and Life Sciences Building 240, 2143 9700 South Cass Avenue Argonne National Laboratory Argonne, IL 60439. 630-252-0045 www.linkedin.com/pub/john-low/15/8b0/5aa/

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