[Users] question about ET on Stampede (TACC)

Mon Feb 4 18:16:53 CST 2013

Bruno

This may be an error in thorn Vectors, or in LoopControl. You could try
updating Vectors from the trunk. LoopControl has probably changed too much
to be useful for you.

The different MPI version that Yosef mentioned is unrelated. Simfactory
uses the MPI version that can be used with the MICs, which is probably not
relevant for you. You could try Yosef's MPI suggestion and compare
performance.

Are you accidentally setting VECTORISE_ALIGNED_ARRAYS?

-erik

On Mon, Feb 4, 2013 at 5:36 PM, Bruno Giacomazzo <
bruno.giacomazzo at jila.colorado.edu> wrote:

> Hi Erik,
> I'm trying to test the Orsted version of ET on stampede. I'm able to
> compile using the option file that you created for the development version
> (except that I needed to add -U__STRICT_ANSI__ to CFLAGS otherwise the
> PITTNullCode/SphericalHarmonicRecon/src/util/fftwfilter util would not
> compile properly because it doesn't find M_PI).
>
> I have some problems with some of the testsuites. Some of them fail
> because of segfaults. For
> example EinsteinEvolve/GRHydro/test/GRHydro_test_tov_ppm_ML.par crashed
> with a segfault. If I look with gdb at the core file, this is the info I
> get:
>
> Program terminated with signal 11, Segmentation fault.
> #0  0x0000000000c6feb3 in
> L__ZN129_INTERNAL_106__work_01052_tg803155_EinsteinToolkit_Orsted_Cactus_configs_sim_build_ML_BSSN_ML_BSSN_convertFromADMBase_cc_ca14dd0a31ML_BSSN_convertFromADMBase_BodyEPK4_cGHiiPKdS4_S4_PKiS6_iPrKPd_196__par_region0_2_306
> ()
>     at
> /work/01052/tg803155/EinsteinToolkit/Orsted/Cactus/arrangements/McLachlan/ML_BSSN/src/ML_BSSN_convertFromADMBase.cc:332
> 332    vec_store_nta_partial(alpha[index],alphaL);
>
> Any idea? Is anyone using the latest stable ET release on Stampede?
>
> Thanks,
> Bruno
>
> On Jan 8, 2013, at 2:03 PM, Bruno Giacomazzo wrote:
>
> 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
>>
>> ----------------------------------------------------------------------
>> There are only 10 types of people in the world:
>> Those who understand binary, and those who don't
>> ----------------------------------------------------------------------
>>
>>
>> _______________________________________________
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>> Users at einsteintoolkit.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
> ----------------------------------------------------------------------
>
>
> 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
> ----------------------------------------------------------------------
>
>

-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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