Xeon Phi

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dsduncs
Posts: 7
Joined: Wed Apr 11, 2012 11:19 pm

Xeon Phi

Post by dsduncs » Tue May 28, 2013 12:29 am

Does any one have any experience running WRFEMS on a xeon phi?
Is a pre-compiled version of WRFEMS going to become available for this?


I see WRF V3.5 supports this processor..
http://www.mmm.ucar.edu/wrf/users/wrfv3 ... s-3.5.html

Thanks for any information

mkudsy
Posts: 4
Joined: Mon Dec 09, 2013 11:34 pm

Re: Xeon Phi

Post by mkudsy » Thu Dec 19, 2013 8:41 pm

Hi dsduncs,

A few days ago my office received a two blades each equipped with a Xeon Phi coprocessor. I will be glad if you could share experience in setting up the cluster, if any.

Regards

dsduncs
Posts: 7
Joined: Wed Apr 11, 2012 11:19 pm

Re: Xeon Phi

Post by dsduncs » Thu Dec 19, 2013 9:24 pm

Sorry - We did not go down this path in the end.
We managed to get enough speed using an over-clocked i7.
I'd be interested to see how you go with them - In the future we will use WRFems for ad-hoc jobs that are run for a number of days/weeks (quick set up) on Amazon or Google Cloud cluster rather than spending money on hardware. For the continuous daily work we use WRF-NMM on a cluster. From memory, Amz costs about $50/day for 4 runs per day so if we expect a job to last less than a month we use Amz..

meteoadriatic
Posts: 1603
Joined: Wed Aug 19, 2009 10:05 am

Re: Xeon Phi

Post by meteoadriatic » Thu Dec 19, 2013 10:05 pm

dsduncs wrote:on Amazon or Google Cloud cluster
I guess this is very unlikely because to get any speedup from clustering you need impressive network speeds between nodes (eg. infiniband). If you don't have such network links, you can add any number of cluster nodes without any speed up (in fact, it would probably slow down more with every added remote node).

dsduncs
Posts: 7
Joined: Wed Apr 11, 2012 11:19 pm

Re: Xeon Phi

Post by dsduncs » Thu Dec 19, 2013 10:42 pm

I plan to do the download, processing and post processing on Amazon.
I believe Amazon use infiniband on their cluster instances.
You do have to 'group' the computers so they are in the same region.
It may make sense for Robert to implement WRFems on a publicly available Amazon Instance.
I am no expert on WRFems or clusters, once I have implemented the latest EMS on Amazon EC2 (or Google), I may make the instance available.
Maybe someone has an instance already available??

Ponce10
Posts: 7
Joined: Sat Mar 22, 2014 12:25 am

Re: Xeon Phi

Post by Ponce10 » Fri Mar 28, 2014 4:21 pm

Dear dsdunc,

did you manage to set up wrf ems on Aamzon EC2?

KR,

ponce10

dsduncs
Posts: 7
Joined: Wed Apr 11, 2012 11:19 pm

Re: Xeon Phi

Post by dsduncs » Mon Mar 31, 2014 10:17 pm

Not really.. But I'm certain it would work.. We have moved to using WRF (new employee) and have this running as a back up at AMZ for our operational system...


We are still looking at Phi but did get the following feed back from some knowledgeable WRF people:
"......one Phi card is equivalent to between one and two Xeon Sandybridge sockets -- that is, between 8 and 16 cores --depending on the workload...."
and power requirements of 2 sandybridges..

So we are waiting for the next version of the Phi - knight's landing..

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