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Subject: Re: [OMPI devel] latency and increasing number of processes
From: Terry Dontje (Terry.Dontje_at_[hidden])
Date: 2008-07-07 11:13:03


Brian W. Barrett wrote:
> On Mon, 7 Jul 2008, Terry Dontje wrote:
>
>> Just curious has anyone done comparisons of latency measurements as
>> one changes the size of a job. That is changing the size of the job
>> (and number of nodes used) and just taking the half roundtrip latency
>> of two of the processes in the job. I am roughly seeing an addition
>> of 5% to the latency for each node added. This is with the TCP and
>> Udapl BTLs. I am curious whether other BTLs have similar issues and
>> if doing some sort of directed polling would help matters?
>
> Is this on Solaris, Linux, or both?
>
My timings were on Solaris but I am interested in both.

--td