From: Dr. Eddie (eackad_at_gmail.com)
Date: Wed Nov 28 2012 - 09:12:12 CST
Anyone have a guess as to how many processors (cores) would be needed to
get around 0.0768112 days/ns with cpu's alone using 20 000 particles?
Thanks,
Eddie
On Sun, Nov 25, 2012 at 8:11 PM, Dr. Eddie <eackad_at_gmail.com> wrote:
> I think it is the gpu's. The cpu's are the same clock speed. The number of
> cuda cores is triple that of the 580 class in the 600 series. So the
> scaling seems to be almost linear with the number of cuda-cores.
> Eddie
>
>
> On Sun, Nov 25, 2012 at 1:25 PM, Aron Broom <broomsday_at_gmail.com> wrote:
>
>> neat, that seems like a fair speedup!
>>
>> Do you think most of that is a result of the GPUs, or are there also big
>> differences in the CPUs? I know NAMD 2.9 gave some minor boosts to GPU
>> performance also, but certainly nothing on the order that you're seeing
>> there.
>>
>> ~Aron
>>
>>
>> On Sun, Nov 25, 2012 at 12:41 PM, Dr. Eddie <eackad_at_gmail.com> wrote:
>>
>>> Hi all,
>>> I you are interested I have some benchmarks of namd 2.9 on nvidia gtx
>>> 690's and 590's:
>>>
>>> The gtx 690's are two video cards per node (thus 4 gpu's per node) on a
>>> dual 16-core AMD processor board (thus 32 cores). for 19777 particles I get:
>>>
>>> Info: Benchmark time: 20 CPUs 0.00808809 s/step 0.0936121 days/ns
>>> 223.324 MB memory
>>>
>>> 16 cpu's
>>> Info: Benchmark time: 16 CPUs 0.00663649 s/step 0.0768112 days/ns
>>> 206.988 MB memory
>>>
>>> This compares with namd 2.8 on a dual 12-core system with a gtx 590:
>>> Info: Benchmark time: 12 CPUs 0.0314254 s/step 0.363719 days/ns 17.9045
>>> MB memory
>>>
>>> This compares with namd 2.8 on a dual 12-core system with a gtx 590 and
>>> a gtx 580 (3 gpu's):
>>> Info: Benchmark time: 12 CPUs 0.0216837 s/step 0.250969 days/ns 17.9739
>>> MB memory
>>>
>>> It seems after 3 gpu's, 4 cpu's per gpu seems to be optimum.
>>> I had tested namd 2.8 with other cpu numbers and 12 always was best. I
>>> don't know if it is something about exceeding the number of cores on a
>>> physical processor or something else.
>>>
>>> Hope this helps!
>>> Eddie
>>>
>>>
>>
>>
>> --
>> Aron Broom M.Sc
>> PhD Student
>> Department of Chemistry
>> University of Waterloo
>>
>>
>
>
> --
> Eddie
>
>
-- Eddie
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