[mvapich-discuss] MVAPICH1 Latency Tuning

[Hideyuki Jitsumoto]

Sayantan,

Thank you for your reply.
I'm sorry about unclear information about the application,
because this application is our supercomputer user's.

Then I need to ask the user the detail of this application.
Probably I'll send you a correct information on Monday.

I'm in flight 10 hours from now, then I'm sorry that I cannot send any
information.

# I wonder I saw you on a taxi toward MPI Forum ?

Thank you,
Hideyuki

On Wed, Mar 10, 2010 at 8:18 PM, Sayantan Sur <surs at cse.ohio-state.edu> wrote:
> Hi Hideyuki,
>
> On Wed, Mar 10, 2010 at 2:34 PM, Hideyuki Jitsumoto
> <jitumoto at gsic.titech.ac.jp> wrote:
>> Hello,
>>
>> I want to reduce the latency and memory use with MVAPICH1.
>> My MPI application has:
>> - < 128KB message size
>> - 4 peer connection for one process
>>
>> I make the temporary paramfile as attached file.
>> Please tell me other tuning point or wrong parameter on this file.
>
> Thanks for your question. It is an important question. We would be
> happy to assist you with tuning MVAPICH for your application.
>
> I took a quick look at the param file. Based on what I see, I think
> some parameters relating to rendezvous protocol are not optimal at
> all. We need to understand your application a little bit more to be
> able to help you better. So, a few questions:
>
> 1) Do you know how many concurrent outstanding sends your application
> has during its iteration steps?
> 2) Can you share a code snippet of the inner loop of your application?
> 3) Which InfiniBand adapters do you have on your cluster?
> 4) What is the node type, number of cores?
>
> This will help us to send you a better send of parameters in the next few days.
>
>>
>> Thank you,
>> Hideyuki
>> --
>> Sincerely Yours,
>> Hideyuki Jitsumoto (jitumoto at gsic.titech.ac.jp)
>> Tokyo Institute of Technology
>> Global Scientific Information and Computing center (Matsuoka Lab.)
>>
>> _______________________________________________
>> mvapich-discuss mailing list
>> mvapich-discuss at cse.ohio-state.edu
>> http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>>
>>
>
>
>
> --
> Sayantan Sur
>
> Research Scientist
> Department of Computer Science
> The Ohio State University.
>



-- 
Sincerely Yours,
Hideyuki Jitsumoto (jitumoto at gsic.titech.ac.jp)
Tokyo Institute of Technology
Global Scientific Information and Computing center (Matsuoka Lab.)