RE: CUDA simulation memory usage

From: Jesper Sørensen (lists_at_jsx.dk)
Date: Wed May 18 2011 - 05:55:59 CDT

I am using a self-compiled version of NAMD 2.7 (final) with MPI and intel compilers.

-----Original Message-----
From: Nicholas M Glykos [mailto:glykos_at_mbg.duth.gr]
Sent: 18. maj 2011 12:12
To: Jesper Sørensen
Subject: Re: namd-l: CUDA simulation memory usage

You don't happen to be using the recent NAMD CUDA version that was heavily leaking memory ?

> I have just been benchmarking our new cluster with GPUs and the memory
> usage that NAMD prints out at the end of the simulation run is MUCH
> larger with GPU's than without the GPU's.
>
> With CUDA:
> WallClock: 1246.348877 CPUTime: 1246.348877 Memory: 41306.324219 MB
>
> Without CUDA
> WallClock: 4025.868896 CPUTime: 4025.868896 Memory: 350.937500 MB
>
> I am assuming that the Memory number with CUDA is wrong - mostly because
> I know that we don't have that much memory in these new machines. Is it
> taking memory on the GFX-card into account, or what is going on?
>
> I've looked through the mailinglist, but I haven't been able to find
> anything on this issue...
>
> Best regards,
>
> Jesper Srensen
> Dept. of Chemistry
> Aarhus University, Denmark
>
>

-- 
          Dr Nicholas M. Glykos, Department of Molecular Biology
     and Genetics, Democritus University of Thrace, University Campus,
  Dragana, 68100 Alexandroupolis, Greece, Tel/Fax (office) +302551030620,
    Ext.77620, Tel (lab) +302551030615, http://utopia.duth.gr/~glykos/

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