[mvapich-discuss] Enjoying the CMA-aware mvapich2 :)

[Jerome Vienne]

Hi Mehmet,

Yes, Cross Memory Attach (CMA) is a very nice kernel feature. I am glad to
know that you are able to confirm that. :)
 It was available since MVAPICH2 1.9 but you had to use a configuration
flag to enable it. With the 2.0 GA, CMA is enable by default if your kernel
can support it (you need a kernel higher than 3.2).

Thanks,
Jerome


On Sat, Aug 2, 2014 at 10:11 AM, Mehmet Belgin <mehmet.belgin at oit.gatech.edu
> wrote:

> Hi Everyone,
>
> I stumbled upon a poster (by Jerome Vienne) during the XSEDE14 conference,
> which explained CMA-related improvements with the latest version of
> MVAPICH2 . It looked too good to be true, so I gave it a shot myself on our
> 64core Interlagos nodes. The latency and bandwidth improvements I observed
> also confirm the significant improvements over rc1 (my findings are
> attached, sorry for the ugly format). The results are mind blowing,
> especially given that they are available to users with no extra effort (no
> special kernel modules, extra runtime parameters, etc).
>
> For once, I wanted to write the list to NOT complain about bugs or
> problems, but rather appreciate the good work the developers are doing. I
> hope this encourages others who still have not given the latest version a
> try to do so :)
>
> Our big applause goes to all the MVAPICH2 developers, and please keep up
> the good work!
>
>  -Mehmet
>
> --
> =========================================
> Mehmet Belgin, Ph.D. (mehmet.belgin at oit.gatech.edu)
> Scientific Computing Consultant | OIT - Academic and Research Technologies
> Georgia Institute of Technology
> 258 Fourth Street, Rich Building, Room 326
> Atlanta, GA  30332-0700
> Office: (404) 385-0665
>
>


-- 
Jerome Vienne, Ph.D
Research Associate
Texas Advanced Computing Center
The University of Texas at Austin
(512) 475-9322
viennej at tacc.utexas.edu
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