[Myrinet] Re: [Myricom help #12328] NAS benchmarks on GM.

Hi Saurabh,

> Note that if we run upto 2 MG (A) applications, it works fine. Problem starts
> when we scale it up over 3 or more..

What type of problems (benchmark crashes, segfaults, incorrect answer, 
error messages) ?

> We are not sure what could be causing this. Is it possible that we get 
> limited by the amount of memory on the LANAI card or could it be host 
> memory limitation ? (128 MB !)    We are also not sure how can we find 
> out what is the usage statistics of the lanai memory at any instant of
> time... 

The memory footprint on the Lanai is bounded. Anyway, it's almost 
constant and it does not depend on the host memory size or the size of 
the job (only number of GM ports, max number of nodes and there is a 
translation cache that will quickly grow to its maximum).

I don't know by heart the size of size of MG(A), but 128 MB may start to
be small (AFAIR, MG's memory footprint is 256^3.
Tell me how it dies, and I will try to reproduce it here if I have no clue.

Patrick

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|   Patrick Geoffray, Ph.D.      [email protected]
|   Myricom, Inc.                http://www.myri.com
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|   Phone: 865-425-0978          Oak Ridge, TN 37830
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