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Subject: Re: [OMPI devel] open ib btl and xrc
From: Pavel Shamis (Pasha) (pasha_at_[hidden])
Date: 2008-01-20 03:37:31


> It easy to see the benefit of fewer qps (per node instead of per peer)
> and less consumption of resources the better but I am curious about
> the actual percentage of memory footprint decrease. I am thinking that
> the largest portion of the footprint comes from the fragments.
BTW here is link to another paper
http://www.cs.sandia.gov/~rbbrigh/papers/ompi-ib-pvmmpi07.pdf
that talks about more efficient usage of receive buffers.
> Do you have any numbers showing the actual memory footprint savings
> when using xrc?
I don't have.

Pasha.
>
> -DON
>
> Pavel Shamis (Pasha) wrote:
>> Here is paper from openib
>> http://www.openib.org/archives/nov2007sc/XRC.pdf
>> and here is mvapich presentation
>> http://mvapich.cse.ohio-state.edu/publications/ofa_nov07-mvapich-xrc.pdf
>>
>> Button line: XRC decrease number of QPs that ompi opens and as result
>> decrease ompi's memory footprint.
>> In the openib paper you may see more details about XRC. If you need
>> more details about XRC implemention
>> in openib blt , please let me know.
>>
>>
>> Instead Don Kerr wrote:
>>
>>> Hi,
>>>
>>> After searching, about the only thing I can find on xrc is what it
>>> stands for, can someone explain the benefits of open mpi's use of
>>> xrc, maybe point me to a paper, or both?
>>>
>>> TIA
>>> -DON
>>>
>>> _______________________________________________
>>> devel mailing list
>>> devel_at_[hidden]
>>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>>>
>>>
>>
>>
>>
>

-- 
Pavel Shamis (Pasha)
Mellanox Technologies