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Subject: Re: [OMPI users] How to replace --cpus-per-proc by --map-by
From: Saliya Ekanayake (esaliya_at_[hidden])
Date: 2014-03-27 04:42:15


Thank you Tetsuya - it worked.

Btw. what's the difference between mapping and binding? I think I am bit
confused here.

Thank you,
Saliya

On Thu, Mar 27, 2014 at 4:19 AM, <tmishima_at_[hidden]> wrote:

>
>
> 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_______________________________________________
> > users mailing list
> > users_at_[hidden]http://www.open-mpi.org/mailman/listinfo.cgi/users
>
> _______________________________________________
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-- 
Saliya Ekanayake esaliya_at_[hidden]
Cell 812-391-4914 Home 812-961-6383
http://saliya.org