[gmx-users] Re: parallel in duals?

[David van der Spoel]

Jones de Andrade wrote:
> Hi David
> 
> Fortunatelly, I don't have to buy now... But I have to upgrade only
> the processor (that's the problem: locked in the sk 939 by now) by the
> end of the year. Full new computers only next year (seems to be good,
> anyway), with all new techs (dual procs mb for normal people, 4x
> cores, etc.).
> 
> So, since I'm locked in a socket, I'm wandering what's better: the
> highest clock possible, or less clock with two cores?
in that case the latter will give you way more performance.

> 
> Thanks a lot...
> 
> Jones
> 
> On 8/1/06, David van der Spoel <spoel at xray.bmc.uu.se> wrote:
> 
>> Jones de Andrade wrote:
>> > Hi David.
>> >
>> > Well, it wasn't me who did the test. :)
>> >
>> > My problem is that I cannot try it; I rather have to choose what to
>> > buy: extra cores, or extra clock frequency?
>>
>> search the mailing list for woodcrest and you will find Florian Haberl's
>> benchmarks.
>> If you have to buy now, Intel woodcrest seems the way to go.
>> >
>> > Does anybody have an advise on this subject?
>> >
>> > Thank you all...
>> >
>> > Jones
>> >
>> > On 8/1/06, David van der Spoel <spoel at xray.bmc.uu.se> wrote:
>> >
>> >> Jones de Andrade wrote:
>> >> > Ok, I know this subject have been discussed in the past.
>> >> >
>> >> > But I started to wander if the basic conclusion (do not use in
>> >> parallel,
>> >> > you should rather use on job for each core) is still up, and if 
>> it is,
>> >> > if there is any hope of change in a foresight future, as well on how
>> >> > much real loss is observed from running one process in parallel when
>> >> > compared to two at the same time.
>> >> Just try it and you know. Somone reported good performance with
>> >> hyperhtreading recently (was it you?)
>> >>
>> >> >
>> >> > I'm wondering about this subject due to the arise of the core 2 
>> duo, as
>> >> > well the expected quad cores from amd and intel and the, semmingly
>> >> > "affordable", dual processor motherboards from AMD for both dual and
>> >> > quad-cores.
>> >> >
>> >> > Thanks you all,
>> >> >
>> >> > Jones
>> >> >
>> >> >
>> >> >
>> >> 
>> ------------------------------------------------------------------------
>> >> >
>> >> > _______________________________________________
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>> >>
>> >> --
>> >> David.
>> >> 
>> ________________________________________________________________________
>> >> David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
>> >> Dept. of Cell and Molecular Biology, Uppsala University.
>> >> Husargatan 3, Box 596,      75124 Uppsala, Sweden
>> >> phone:    46 18 471 4205        fax: 46 18 511 755
>> >> spoel at xray.bmc.uu.se    spoel at gromacs.org   http://folding.bmc.uu.se
>> >> 
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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>>
>> -- 
>> David.
>> ________________________________________________________________________
>> David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
>> Dept. of Cell and Molecular Biology, Uppsala University.
>> Husargatan 3, Box 596,      75124 Uppsala, Sweden
>> phone:    46 18 471 4205        fax: 46 18 511 755
>> spoel at xray.bmc.uu.se    spoel at gromacs.org   http://folding.bmc.uu.se
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> _______________________________________________
>> gmx-users mailing list    gmx-users at gromacs.org
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>>
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-- 
David.
________________________________________________________________________
David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  	75124 Uppsala, Sweden
phone:	46 18 471 4205		fax: 46 18 511 755
spoel at xray.bmc.uu.se	spoel at gromacs.org   http://folding.bmc.uu.se
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