Present: Andreas , Bhavesh, Eliu, Qian, Erik, Frank, Roberto, Vassili, Roland, Steve, Ian
Hangout limit: * reached again, will try alternatives at increased reate ** could try webex but no Linux client and using a phone is not convenient (eg one needs to use specific headset) ** will look into zoom, other options New thorns: LORENE: * needs to be reviews Failing tests: * Roland has not looked into SphericalHarmoncRecon test * Frank has not looked into GRHydro ** older tests by Roland indicate that the NaNs go away and the test passed if one disables the assoicative math option of -Ofast ** right now the exact file / code that is affected by this is not known now whether this is a compiler bug or not KNL performance: * is highly depended on MPI and OpenMP settings * best situation is often pure MPI since our MPI parallelization is more efficient than our OpenMP parallelization * comparison per node on NERSC Cori Erik finds that Haswell nodes are 5 times as fast as KNL. This is due to our code generator being optimized for Haswell. For just a kernel Erik got 5% of peak on Haswell and 10% on KNL. So we should be able to better but it will require changes to the code generator * the crucial change seems to be to introduce tile based thread parallelization. LoopControl does not quite work yet, Kranc already does this tiling but its overhead is too large. * plus local stuff like vectorization, avoid divisions, sqrt Vectorization in hydro code: * the hydro code in CactusExamples performs better than GRHydro * better able to use vectorization * Erik would like to give a presentation on this in the near future KNL on stampede: * will only be able to provide simfactory files for KNL machines but not optimized code * currently works on Cori and Marconi but not Stampede * removing tacc_affinity helps a bit but now it crashes in TwoPunctures after interpolation * Ian will provide instructions via email on how to obtain a core dump file new user tutorial: * add mention in tutorial that this file is tuned for single workstation and won't work on cluster with many nodes due to resolution being too low * add some instructions on how to use ET as a black box ** diagnostics output in example parfiles ** env variables to set ** how to set up ET on new machine RNSID: * proposal to introduce RNSID into ET * https://bitbucket.org/GravityPR/prthorns.git * ask for inclusion process to be started just after the next release which should be about a month from now * guidelines for contribution are: http://einsteintoolkit.org/contribute.html Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://keys.gnupg.net.
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