On Feb 14, 2011, at 8:15 PM, Siew Yin Chan wrote:
> Thank you very much for your input which makes my direction pretty clear now.
> Depending on the progress of my project, I may be adventurous to try the
> nightly tarball, or may wait until a stable version is released.
FWIW, we release 1.5.2r
to a more
flexible binding option in OMPI's future release.
Chan
--- On Mon, 2/14/11, Jeff Squyres wrote:
> From: Jeff Squyres
> Subject: Re: [hwloc-users] hwloc-ps output - how to verify process binding on
> the core level?
> To: "Hardware locality user list"
On Feb 14, 2011, at 9:35 AM, Siew Yin Chan wrote:
> 1. I tried Open MPI 1.5.1 before turning to hwloc-bind. Yep. Open MPI 1.5.1
> does provide the --bycore and --bind-to-core option, but this option seems to
> bind processes to cores on my machine according to the *physical* indexes:
FWIW, you
Subject: Re: [hwloc-users] hwloc-ps output - how to verify process binding on
the core level?
To: "Hardware locality user list"
List-Post: hwloc-users@lists.open-mpi.org
Date: Monday, February 14, 2011, 7:26 AM
On Feb 13, 2011, at 4:07 AM, Brice Goglin wrote:
>> $ mpirun -np 4 hwloc-bind socket:0.core:0-3 ./test
>>
>> 1. Does hwloc-bind map the processes *sequentially* on *successive* cores of
>> the socket?
>
> No. Each hwloc-bind command in the mpirun above doesn't know that there are
> other hwloc
Brice Goglin, le Mon 14 Feb 2011 07:56:56 +0100, a écrit :
> The operating system decides where each process runs (according to the
> binding). It usually has no knowledge of MPI ranks. And I don't think it looks
> at the PID numbers during the scheduling.
It doesn't either, indeed.
Samuel
Le 14/02/2011 07:43, Siew Yin Chan a écrit :
>
>>
>>
>
> No. Each hwloc-bind command in the mpirun above doesn't know that
> there are other hwloc-bind instances on the same machine. All of
> them bind their process to all cores in the first socket.
>
> => Agree. For socket:0.core:0-3 ,
--- On Sun, 2/13/11, Brice Goglin wrote:
From: Brice Goglin
Subject: Re: [hwloc-users] hwloc-ps output - how to verify process binding on
the core level?
To: "Hardware locality user list"
List-Post: hwloc-users@lists.open-mpi.org
Date: Sunday, February 13, 2011, 3:07 AM
Le 13/02/2011 04:54, Siew Yin Chan a écrit :
> Good day,
>
> I'm studying the impact of MPI process binding on communication costs
> in my project, and would like to use hwloc-bind to achieve
> fine-grained mapping control. I install hwloc 1.1.1 on a 2-socket
> 4-core machine (with 2 dual-core dies
Good day,
I'm studying the impact of MPI process binding on communication costs in my
project, and would like to use hwloc-bind to achieve fine-grained mapping
control. I install hwloc 1.1.1 on a 2-socket 4-core machine (with 2 dual-core
dies in each socket), and run hwloc-ps to verify the bindi
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