[Wrf-users] cluster interconnect - Infiniband vs 10 gigabit ethernet

mmkamal at sciborg.uwaterloo.ca mmkamal at sciborg.uwaterloo.ca
Thu Apr 14 13:31:52 MDT 2011

Hi Mike,

Yes, interconnect is a big issue while running WRF on a HPC cluster.  
InfiniBand increases WRF performance by up to 115% for cluster size of  
24 nodes. I have used GigE since last one year but when I get the  
opportunity to use Infiniband it really surprised me. You can take a  
look on the following two resources for further details.




Quoting "Zulauf, Michael" <Michael.Zulauf at iberdrolaren.com>:

> Hi all - quick question. Does anyone have data or experience comparing
> the performance and scaling of WRF with cluster interconnects utilizing
> 10 gigabit ethernet (10GigE) vs Infiniband?
> We're looking to expand and update our computing resources, and we'd
> originally spec'd it with Infiniband. The nodes will have either dual
> quad- or hex-core Nehalem type processors. There's been some IT
> pushback, suggesting that we should go with 10GigE. I don't have any
> direct experience with 10GigE, but my experience with 1GigE shows that
> Infiniband scales far better.
> I've seen what I'd consider marketing material on the web that suggests
> that 10GigE is comparable to Infiniband, but they don't specifically
> mention WRF. On the other hand, I've seen other sites that suggest an
> Infiniband interconnect is far superior. Again, these don't
> specifically mention WRF. I know the particular application in use is
> critical when deciding these things, and that WRF is a pretty demanding
> application when it comes to the interconnect.
> My suspicion is that Infiniband is still significantly superior, but if
> I'm going to be able to make any headway with IT, then I'll probably
> need some type of numbers to back up my arguments.
> Can anyone help?
> Thanks,
> Mike
> --
> michael.zulauf at iberdrolaren.com
> Mike Zulauf
> Meteorologist, Lead Senior
> Wind Asset Management
> Iberdrola Renewables
> 1125 NW Couch, Suite 700
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