[Users] meeting minutes for 2016-06-27

Roland Haas rhaas at aei.mpg.de
Mon Jun 27 10:40:12 CDT 2016

Present: Frank, Eloisa, Matt, Roland, Steve, Zach, Erik,

Using slack to replace the IRC channel:
* Frank inverstigated slack and used it in a different project and has
  had good experience so far. A test slack project has been created:
  https://einsteintoolkit.slack.com if you would to test this please
  send an email an Frank Loeffler knarf at cct.lsu.edu until we have a
  more permanent solution (in case we decide to use slack). Please
  provide your email address and name to appear in slack.

Making grid function storage in HydroBase optional:
* currently there are a number of grid functions that are not always
  being used or could be recomputed
* there is a desire to make storage for those optional with the default
  being to have storage
* Roland feels that this can be cumbersome if all client thorns require
  logic to check for storage rather than being able to rely on a
  complete set of variables always being present. This applies in
  particular to eps which can only be recomputed if the EOS is known

Making GRHydro_Initdata independent of HydroBase:
* agree that this is good idea, would make it useful as ID generator
  for other ID thorns eg for shock tubes
* some parts are unfortunately tied to GRHydro and would have to be
  moved out of the thorn

Reducing number of checkpointed variables in McLachlan:
* RHS variables are fine to not be checkpointed. There should be a
  helper thorn ML_BSSN_Helper that adjust the checkpoint tags at runtime
* constraints need to be checkpointed since they require prolongation
  to compute which cannot be re-created after recovery

Carpet-preSync by Steve, a pull request exists:
* an attempt to move the start of the SYNC forward so that a grid
  function that is computed only in the interior later needed
  everywhere SYNCing happens automatically and early

TeamSpeak or Mumble as Google Hangout replacement:
* both use equivalent technology
* community is split about which one is better
* hosting at LSU may be possible as IT is interested in this
* external hosters tend to offer both for little money, will need grant
  money for this


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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