[gmx-users] Beware of your interconnect hardware

David van der Spoel spoel at xray.bmc.uu.se
Tue May 23 20:15:19 CEST 2006

Jason O'Young wrote:
> Hey All,
> Not too long ago I posted about my problems with processes freezing  
> (just to refresh, I am running two dual-core nodes for a total of  four 
> processes).
> I managed to remedy the problem by removing the Dell PowerConnect  2708 
> Gigabit switch and replacing it with a simple crossover cable.  Ever 
> since then, the system has been running rock solid.
> Are there actually issues with switch hardware with Gromacs? I used  to 
> think that these things were pretty much fool proof. I spent about  a 
> month trying to fix what I perceived as a Linux issue.
> That poses a question I have to all of you. Is there a particular  brand 
> or model of switch you recommend? Eventually I would like to  add 
> another node to the system!

If you read the Rocks mailing lists (Cluster Linux Distro) you will be 
surprised. Dell switches are considered to be crap. Get HP instead (if 
your contract allows it...). Go to www.rocksclusters.org for more info.

> Thanks,
> Jason
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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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