Hi Thomas,
The issue is not one of the code actually working or not but one of
performance. Unfortunately I don't have nay 1.3 hardware left to test on
but our assumption is that SPFP will be substantially slower then APDP on
V1.3 (C1060 type) hardware. If you have something you ran previously with
SPDP on the same card it would be interesting to know what the performance
is if you use the new default SPFP version of the code.
All the best
Ross
On 9/5/12 9:25 PM, "Thomas Zeiser" <thomas.zeiser.rrze.uni-erlangen.de>
wrote:
>On Wed, Sep 05, 2012 at 08:07:08AM -0400, Jason Swails wrote:
>> On Wed, Sep 5, 2012 at 6:58 AM, Thomas Zeiser <
>> thomas.zeiser.rrze.uni-erlangen.de> wrote:
>>
>> > Hello,
>> >
>> > according to the web page, NVidia GPUs with Hardware Version 1.3
>> > should only support SPDP (and DPDP) but not the new SPFP mode.
>> >
>> > However, if a SPFP binary is run on a M1060 card which is supposed
>> > to be HW-1.3, pmemd.cuda does not abort. (At least not for
>> > Cellulose NPT).
>> >
>> > What does that mean?
>> > (1) SPFP is supported on HW-1.3, or
>> > (2) there is a bug in pmemd.cuda not aborting if SPFP is detected
>> > on HW-1.3, or
>> > (3) pmemd.cuda automatically switches (at runtime) to correct a
>>non-SPFP
>> > branch for HW-1.3 despite being compiled with default options
>> > and mentioning SPFP
>> > (4) SPFP is only used in parts which are not relevant for Cellulose
>> > NPT, thus, everything is o.k. for this specific case
>> >
>>
>> Do the SPFP tests pass with the 1.3 card?
>
>I run the serial tests ... many of them (64) pass, some (12)
>probably show minor round-off effects, and a couple of tests did
>not finish within a few minutes - thus, I killed these.
>
>
>Full details are attached.
>
>
>Best regards,
>
>Thomas Zeiser
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Received on Thu Sep 06 2012 - 17:00:04 PDT
