[Users] question about ET on Stampede (TACC)

[Bruno Giacomazzo]

Hi Erik,
	thanks a lot for the info. I will then wait for your updated Simfactory scripts before compiling on it.

Cheers,
Bruno

On Jan 8, 2013, at 12:58 PM, Erik Schnetter wrote:

> Bruno
> 
> I'm currently testing the Einstein Toolkit on Stampede. Even without the MICs, this is a very nice and fast system, almost ideal for the ET. The scripts in Simfactory should almost work; I will update them in the coming days. (The system was unavailable in the past days, so I couldn't test them recently.)
> 
> The MICs (Xeon Phis) can be used in two ways. One can view them as an accelerator (like a GPU), and then offload certain calculations there. Unfortunately neither CUDA nor OpenCL are available there, hence one has to use PGI's OpenACC and deal with PGI's compiler that has serious problems with OpenMP.
> 
> The other option is to view the Xeon Phis as regular processors. I believe that I/O will be quite slow from them, and MPI does not (yet?) fully work there, but apart from this, one can run the ET there directly. The small caches and in-order execution will make for some challenges; in particular, multi-threading e.g. via OpenMP will be a must.
> 
> In the end, I assume that one would want to use them either as accelerator (if not via OpenCL then via something equivalent, just different), or as regular compute nodes where Carpet will have to be enhanced to handle the different CPU speeds between Xeons and Xeon Phis.
> 
> -erik
> 
> 
> 
> On Tue, Jan 8, 2013 at 2:35 PM, Bruno Giacomazzo <bruno.giacomazzo at jila.colorado.edu> wrote:
> Hi,
> 	I'd like to compile and run ET on the new TACC cluster Stampede. Did anybody run ET on stampede?
> I see that there are already simfactory scripts for stampede in the ET development version, but I'm not sure if they have been already fully tested (I see that there are comments about job submission not having been tested yet).
> 
> 	I'm also curious to know if you think that the hybrid approach can be of any use for ET/GRHydro (or ET/Whisky) on that machine. I'm not very familiar with the Intel Phi coprocessor and MIC programming (but it seems similar to GPU, except for being much easier to use).
> 
> Thanks,
> Bruno
> 
> Dr. Bruno Giacomazzo
> JILA - University of Colorado
> 440 UCB
> Boulder, CO 80309
> USA
> 
> Tel.  : +1 303-492-5170
> Fax  : +1 303-492-5235
> email : bruno.giacomazzo at jila.colorado.edu
> web: http://www.brunogiacomazzo.org
> 
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> -- 
> Erik Schnetter <schnetter at cct.lsu.edu>
> http://www.perimeterinstitute.ca/personal/eschnetter/

Dr. Bruno Giacomazzo
JILA - University of Colorado
440 UCB
Boulder, CO 80309
USA

Tel.  : +1 303-492-5170
Fax  : +1 303-492-5235
email : bruno.giacomazzo at jila.colorado.edu
web: http://www.brunogiacomazzo.org

----------------------------------------------------------------------
There are only 10 types of people in the world:
Those who understand binary, and those who don't
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