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Subject: Re: [OMPI devel] RFC: Add support to send/receive CUDA device memory directly
From: Brice Goglin (Brice.Goglin_at_[hidden])
Date: 2011-04-14 12:41:59


hwloc (since 1.1, on Linux) can already tell you which CPUs are close to
a CUDA device, see
https://svn.open-mpi.org/trac/hwloc/browser/trunk/include/hwloc/cuda.h
and https://svn.open-mpi.org/trac/hwloc/browser/trunk/include/hwloc/cudart.h
Do you need anything else ?

Brice

Le 14/04/2011 17:44, Ken Lloyd a écrit :
> I'd suggest supporting CUDA device queries in carto and hwloc.
>
> Ken
>
>
> On Thu, 2011-04-14 at 11:25 -0400, Jeff Squyres wrote:
>> On Apr 13, 2011, at 12:47 PM, Rolf vandeVaart wrote:
>>
>> > By default, the code is disable and has to be configured into the library.
>> > --with-cuda(=DIR) Build cuda support, optionally adding DIR/include,
>> > DIR/lib, and DIR/lib64
>> > --with-cuda-libdir=DIR Search for cuda libraries in DIR
>>
>> My $0.02: cuda shouldn't be disabled by default (and only enabled if you --with-cuda). If configure finds all the Right cuda magic, then cuda support should be enabled by default. Just like all other optional support libraries that OMPI uses.
>>
>> More specifically: the cuda support code in OMPI should strive to be such that it can be enabled by default and not cause any performance penalties to codes that do not need/use any cuda stuff. I'm not saying I know how to do that -- I'm just saying that that should be the goal. :-)
>>
>>
>
>
>
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