[Users] meeting minutes for 2016-06-27
Steven R. Brandt
sbrandt at cct.lsu.edu
Mon Jun 27 11:11:40 CDT 2016
The pull request for the auto synchronization is here:
https://bitbucket.org/eschnett/carpet/pull-requests/13/presync/diff
These changes helped us resolve a problem with the GPU ML_BSSN, so I'd
like to not lose them. Thanks.
Cheers,
Steve
On 06/27/2016 10:40 AM, Roland Haas wrote:
> 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
>
> Yours,
> Roland
>
>
>
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