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Subject: Re: [OMPI users] Bug in 1.3.2?: sm btl and isend is serializes
From: Mark Bolstad (the.render.dude_at_[hidden])
Date: 2009-06-19 13:28:04


Thanks, but that won't help. In the real application the messages are at
least 25,000 bytes long, mostly much larger.

Thanks,
Mark

On Fri, Jun 19, 2009 at 1:17 PM, Eugene Loh <Eugene.Loh_at_[hidden]> wrote:

> Mark Bolstad wrote:
>
> I have a small test code that I've managed to duplicate the results from a
>> larger code. In essence, using the sm btl with ISend, I wind up with the
>> communication being completely serialized, i.e., all the calls from process
>> 1 complete, then all from 2, ...
>>
>
> I need to do some other stuff, but might spend time on this later. For
> now, I'll just observe that your sends are rendezvous sends. E.g., if you
> decrease BUFLEN from 25000 to 2500 (namely, from over 4K to under 4K), the
> behavior should change (to what you'd expect). That may or may not help
> you, but I think it's an important observation in reasoning about this
> behavior.
>
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