[gmx-users] Gromacs 4.6 with CUDA 4.2

Szilárd Páll szilard.pall at cbr.su.se
Tue May 8 00:43:46 CEST 2012


On Fri, May 4, 2012 at 9:20 PM, Roland Schulz <roland at utk.edu> wrote:
>
>
> On Wed, Apr 25, 2012 at 9:38 AM, Szilárd Páll <szilard.pall at cbr.su.se>
> wrote:
>>
>> On Wed, Apr 25, 2012 at 11:43 AM, SebastianWaltz
>> <sebastian.waltz at physik.uni-freiburg.de> wrote:
>> > Dear all,
>> >
>> > will the new version 4.6 work together with CUDA 4.2? Would be good to
>> > know, since this is needed for the new NVIDIA Gemini cards with Kepler
>> > technology.
>>
>> Yes it will. I would like to point out that the "needed" part is not
>> exactly true, binaries compiled with pre-4.2 can run equally fast on
>> Kepler especially if JIT compilation of PTX code is enabled.
>>
>> Moreover, current 4.2 pre-release compiler produces slower code than
>> CUDA 4.0 not only for Fermi but also for Kepler. We'll have to see
>> brins the final CUDA 4.2 release + official drivers.
>
>
> Szilard, had you already a chance to test the 4.2 final release and can
> recommend which version to use?
> Is the difference in performance significant?

Yes, I've tried the 4.2 release (4.2.9) and the performance regression
is still present, the kernels are unfortunately up to 5% slower on
Fermi compared to CUDA 4.0.

--
Szilárd


> Roland
>
>>
>>
>> --
>> Szilárd
>>
>>
>>
>>
>> > Thanks,
>> >
>> > Basti
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