[mpich-discuss] How do I use the HYDRA_BINDING environmental variable?

[Kenneth Raffenetti]

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 at 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 at 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 at 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 at 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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