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Subject: Re: [OMPI users] qp memory allocation problem
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-09-12 13:10:29


On Sep 12, 2011, at 12:39 PM, Shamis, Pavel wrote:

> OMPI Developers:
>
> Maybe we should consider disabling the use of per-peer queue pairs by default. Do they buy us anything? For what it is worth, we have stopped using them on all of our large systems here at LANL.
>
> It is cons-and-pros of using per-peer queues. It really depends on application behavior.
> I would suggest some dynamic-adjustment solution. If NP > some_threshould -> switch to SRQ or XRC.

Definitely worth thinking about. IB vendors?

> Also I would recommend to print our some informative error message for "qp errno says Cannot allocate memory" error.

+1. That's a terrible error message.

-- 
Jeff Squyres
jsquyres_at_[hidden]
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