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Subject: Re: [OMPI users] How to replace --cpus-per-proc by --map-by
From: tmishima_at_[hidden]
Date: 2014-03-27 04:19:17


Hi Saliya,

What you want to do is map-by node. So please try below:

-np 2 --map-by node:pe=4 --bind-to core

You might not need to add --bind-to core, because it's default binding.

Tetsuya

> Hi,
>
> I see in v.1.7.5rc5 --cpus-per-proc is deprecated and is advised to
replace by --map-by <obj>:PE=N.
> I've tried this but I couldn't get the expected allocation of procs.
>
> For example I was running 2 procs on 2 nodes each with 2 sockets where a
socket has 4 cores. I wanted 1 proc per node and bound to all cores in one
of the sockets. I could get this by using
>
> --bind-to core: --map-by ppr:1:node --cpus-per-proc 4 -np 2
>
> Then it'll show bindings as
>
> [i51:32274] MCW rank 0 bound to socket 0[core 0[hwt 0]], socket 0[core 1
[hwt 0]], socket 0[core 2[hwt 0]], socket 0[core 3[hwt 0]]:
[B/B/B/B][./././.]
> [i52:31765] MCW rank 1 bound to socket 0[core 0[hwt 0]], socket 0[core 1
[hwt 0]], socket 0[core 2[hwt 0]], socket 0[core 3[hwt 0]]:
[B/B/B/B][./././.]
>
>
> Is there a better way without using -cpus-per-proc as suggested to get
the same effect?
>
> Thank you,
> Saliya
>
>
>
> --
> Saliya Ekanayake esaliya_at_[hidden]
> Cell 812-391-4914 Home 812-961-6383
> http://saliya.org_______________________________________________
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