[gmx-users] Apples-to-Apples comparison for dpcc benchmark

[Nathan Moore]

> On Wed, 2005-06-15 at 13:53 -0500, Nathan Moore wrote:
>> I want to make sure that I understand the meaning of the GROMACS
>> benchmarks.
>>
>> When I look at the logfile from a 32processor dpcc run, I see the
>> following text near the end of the file:
>>
>>
>>         M E G A - F L O P S   A C C O U N T I N G
>> ...
>>                NODE (s)   Real (s)      (%)
>>        Time:   1464.000   1464.000    100.0
>>                        24:24
>>                (Mnbf/s)   (GFlops) (ps/NODE hour) (NODE hour/ns)
>> Performance:     79.584      2.878     24.590     40.667
>>
>>
>> Do I understand correctly that the number to compare is total ps/day,
>> 24.590 ps/Node-hour * 24 hours/day * 32 processors = 18,888 ps/day ?
> No I'm sorry...
> 24.59 * 24 = 600 ps/day.
> which is roughly the same as 4 Xeons at 4 times the clock.
>
>>
>> Additionally, the published parallel dpcc benchmarks use single
>> precision
>> and grompp options -sort and -shuffle, 5000 timesteps?  Are there any
>> other optimization options I should be aware of when making a
>> comparison?
>>
> This is all.

ok, thanks, ps/day = (ps/node-hour)*24

this means that quoted ps/day is really ps/node-day?

nt