Re: AW: 2CPU+1GPU vs 1CPU+2GPU

From: Marcel UJI (IMAP) (arzo_at_uji.es)
Date: Tue Feb 14 2012 - 03:26:50 CST

Yes I have found other sources with similar results (see
http://www.cs.stanford.edu/people/ihaque/talks/resilience-2010.pdf), so
I think I will finally go for those Tesla cards.

Thank you all for your help!

Marcel

Al 14/02/12 08:18, En/na Norman Geist ha escrit:
>
> Hi,
>
>
>
> I just wanted to add that I was pretty surprised when I first saw the
> ECC error counters on my Tesla C2050. Well in fact it's the total of
> double bit and I never investigated their occurrence but I would only
> go without ECC with some belly aches because everything that doesn't
> work or behave strange in your simulations, or even what works
> incredibly great can come due to artifacts of memory errors, that
> might sound a little overdone, but is possible. For what else, except
> of reliability, ECC has been developed. But I'm really not sure what
> influence those errors can really have, but with ecc you have one
> thing less to survey when problems occur.
>
>
>
> Best wishes
>
>
>
> Norman Geist.
>
>
>
> *Von:* owner-namd-l_at_ks.uiuc.edu [mailto:owner-namd-l_at_ks.uiuc.edu] *Im
> Auftrag von *Ajasja Ljubetic
> *Gesendet:* Montag, 13. Februar 2012 16:09
> *Cc:* Marcel UJI (IMAP); namd-l_at_ks.uiuc.edu
> *Betreff:* Re: namd-l: 2CPU+1GPU vs 1CPU+2GPU
>
>
>
> One final thing. I've done some benchmarking with a AMD 6-core
> desktop and a GTX-570 and it ends up being about equal (slightly
> faster) than a 6-core xeon with an M2070. You can buy a 3GB
> GTX580 for a fraction of the price of a M series card, and an AMD
> CPU (particularly the 3 GHz 6-core Thubans) will be close to half
> the price of the intel. While I'm sure the intel chip is
> generally superior to the AMD one, it doesn't seem to be a factor
> when running NAMD. So I would say buy two desktops and save
> yourself money and also gain performance. I know there is the
> lack of ECC memory with the GTX series, but I'm really not
> convinced that is a big issue for MD (maybe someone on the list
> has a different opinion).
>
>
>
> I'm running my simulations on several GTX 560 Ti for half a year now
> and it works great! So I would back up this advice.
>
>
>
> Best regards,
>
> Ajasja
>
>
>
> ~Aron
>
>
>
>
>
> On Mon, Feb 13, 2012 at 6:44 AM, Nicholas M Glykos
> <glykos_at_mbg.duth.gr <mailto:glykos_at_mbg.duth.gr>> wrote:
>
>
>
> You will (hopefully) hear from Axel on this, but :
>
>
> > as it would give more speed for our NAMD based simulations
>
> Is this an assumption or the result of benchmarking the two hardware
> configurations with your intended system sizes ? For small (atom-wise)
> systems, you shouldn't expect much improvement by increasing the
> number of
> GPUs (and for tiny systems the 1CPU+2GPU may not scale at all).
>
> My twocents,
> Nicholas
>
>
> --
>
>
> Nicholas M. Glykos, Department of Molecular Biology
> and Genetics, Democritus University of Thrace, University Campus,
> Dragana, 68100 Alexandroupolis, Greece, Tel/Fax (office)
> +302551030620 <tel:%2B302551030620>,
> Ext.77620, Tel (lab) +302551030615 <tel:%2B302551030615>,
> http://utopia.duth.gr/~glykos/ <http://utopia.duth.gr/%7Eglykos/>
>
>
>
> --
> Aron Broom M.Sc
> PhD Student
> Department of Chemistry
> University of Waterloo
>
>
>

-- 
Dr. Marcel Aguilella-Arzo
Professor Titular d'Universitat, Física Aplicada
Departament de Física
Escola Superior de Tecnologia i Cie`ncies Experimentals
Universitat Jaume I
Av. Sos Baynat, s/n
12071 Castelló de la Plana (Spain)
+34 964 728 046
arzo_at_fca.uji.es

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