> "Elken, Tom" writes:
> > there is a kcopy module
> > that assists shared memory MPI bandwidth in a way similar to knem.
>
> Somewhat OT, but is it documented? I went looking some time ago, and
> couldn't find anything more useful than the source.
[Tom]
Strangely no. Though there were some ma
> -Original Message-
> From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org]
> On Behalf Of Dave Love
> Sent: Thursday, July 18, 2013 1:22 PM
> To: Open MPI Users
> Subject: Re: [OMPI users] knem/openmpi performance?
>
> Paul Kapinos writes:
>
> > Jeff, I would turn the qu
I'm assuming that you are referring to the fact that MPI uses an "int" to
specify the "length" of a message (i.e., the number of items to be sent and
received), like this:
MPI_Send(buffer, count, datatype, ...)
"count" is an int, which means that it has a max value of INT_MAX, which, on
toda
Le 18/07/2013 13:23, Dave Love a écrit :
> Mark Dixon writes:
>
>> On Mon, 15 Jul 2013, Elken, Tom wrote:
>> ...
>>> Hope these anecdotes are relevant to Open MPI users considering knem.
>> ...
>>
>> Brilliantly useful, thanks! It certainly looks like it may be greatly
>> significant for some appl
Mark Dixon writes:
> On Mon, 15 Jul 2013, Elken, Tom wrote:
> ...
>> Hope these anecdotes are relevant to Open MPI users considering knem.
> ...
>
> Brilliantly useful, thanks! It certainly looks like it may be greatly
> significant for some applications. Worth looking into.
>
> All the best,
>
>
"Elken, Tom" writes:
>> I was hoping that someone might have some examples of real application
>> behaviour rather than micro benchmarks. It can be crazy hard to get that
>> information from users.
> [Tom]
> I don't have direct performance information on knem, but with Intel's
> (formerly QLogic
Paul Kapinos writes:
> Jeff, I would turn the question the other way around:
>
> - are there any penalties when using KNEM?
Bull should be able to comment on that -- they turn it on by default in
their proprietary OMPI derivative -- but I doubt I can get much of a
story on it. Mellanox ship it
Dear Mike,
Thank you for your response. I use this program
http://reduze.hepforge.org/
I did not rite its code myself.Did I understand you right?
You mean I have to use the new version of OMPI namely:
OMPI 1.7
because the version which I use is: mpirun (Open MPI) 1.5.5
What is IB ?
thank you
Dear Changsheng,
thank you very much for your help.
Since I did not the code, and use it I have to see more precise in the code.
But your code can help me definitely.
Thank you again
Zitat von users-requ...@open-mpi.org:
--
Message: 3
Date: Wed, 17 Jul 2013 16:58:
I'm interested in connecting new Java programs with legacy programs
written in C and Fortran using MPI (so that they are machine independent
and parallel). To try this out at first, I was hoping to simply Send
arrays of basic datatypes (integer, floats, etc.) from a Java program to
a simple C o
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