Meeting minutes:

Present were: Peter, Erik, Frank, Eloisa, Ian, ROland, Tanja, Bruno, Yosef

Carpet/Hg test runs: * AEI (Ian) ran a production type inspiral simulations and finds speed differences around 3% and waveform differences around 10^-4 which is below finite differencing errors. * however since vectorization does not yet work in Carpet/Hg and AEI usually uses it to obtain a 20% speed increase they will not use it in actual for-paper simulations * GT (Roland) ran a hydro simulation which so far produces similar results in git and hg, but has not progressed far due to issues with learning how to use simfactory

Outstanding failing testsuites: * RotatingSymmetry180/90 works again with Carpet/Hg * QLM still fails (with MPI errors)

Simfactory/python: * GT used simfactory/python for the first time, found it to be a large piece of software, would like more documentation and tutorials that are up-to-date * reiterate ticket 221 https://trac.einsteintoolkit.org/ticket/221 * RIT needs possibility to update parameter files in an ongoing simulation (already possible by modifying the file directly) * in summary: ** want more/corrected/updated documentation before the release (all contribute, please) ** maybe extract/incorporate documentation into python code to try and keep it up to date ** Erik will have a look at Ian's existing documentation http://www.aei.mpg.de/~ianhin/simfactory-userguide/ * wishlist (no particular order or priority): ** check for stalled simulations ** check when restarts fails continuously do to encountering the same error again and again ** copy input data files into simulation directory

CCE: * try to simplify setup of parameters (relation between them) * check if unigrid Carpet can be used instead of PUGH as well (Yosef thinks is should but is not quite sure) * copy only required thorns from incoming to ET, leave out the ones that are not supported * Caltech extraction thorn (Worldtube) still finds NaNs, hopes to fix by end of month

Fall meeting: * see reminder email:

• The fall workshop will be a "two-track" workshop, in the following sense: There will be a ET-workshop, covering a selection of mhd/eos/radiation transport questions. Here we need to decide on which topic and someone to invite (but without financial support at this point). There will also be a Cactus-workshop, at the same time, the same building, sharing the same room for part of the time, sharing some discussions, and of course sharing the breaks. This is for people with only moderate interest in the ET workshop topics, but greater interest in infrastructure development. Prime candidates for topics here are improved Cactus scheduling and GPGPU support.

  I am happy to be able to say that coffee breaks are covered from LSU side. Transportation, usual meals and hotels have to be covered by the participants though. Information to suggested hotels ect isn't available yet.

MHD: * harmonic shift in McLachlan patch does not currently work, Ian and Bruno will work on this

Yours, Roland