Minutes for the Einstein Toolkit Meeting, 20250731.
https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call
9am CDT Thursdays
Present: Peter D, Leo W, Bill G, Deborah F, Maxwell R, Johnny T, Beyhan
K, Hector I, Keith D, Yosef Z
Chair Leo, Minutes Bill
* BBH Gallery example (Zach and Peter)
Peter, still not yet done, been too busy.
* Unanswered Questions on the mailing list
https://www.einsteintoolkit.org/tools/unanswered.php
** 25 July SimFactory placeholder macros.
Confusion with the @XXX@ macros and where they are set and changed.
** 23 July Share Your Feedback...
Seems that it should not be in our mailing list, refers to software and
network tools(?).
* Open Tickets
https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=new&sort=-updated_on
#2773, CarpetX thorndoc confused in InterLatex.pl. Assigned to Steve.
#2867, WaveToyX examples have HDF5 output error. Not assigned.
#2866, Problem building ET on MN5: OpenCL (Marenostrum 5). Not assigned.
#2764, PUGH tries to free memory not allocated by malloc. Assigned to
Beyhan K. More work to be done.
#963, Improve McLachlan accuracy. Original post 2012. Peter, we are
trying to compare and see how it compares with NS simulations as well.
* Tickets for Review
https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open&sort=-updated_on&q=Please%20review
Not much discussion.
* Any Other Business
** Leo, question maybe for Steve, does anyone use the ET in clusters but
through apptainer or singularity images? Steve does this. Leo is
trying to do that and working with his cluster folks. Bill is also
interested in that. Leo trying to setup with base layer that is
operating system and then compilers and then external libraries, say
external Lorene, and last a thornlist or par file. The last image would
behave as ET would. Has it working locally but when tries with MPI on
cluster with multiple nodes it hangs, problem with internode
communication. Peter, Steve has been able to run MPI jobs with
containers...maybe using the right MPI tools with Slurm to run them.
** Johnny, question also for Hector, variables needed for CCE Exporter.
Want to use the CCE Export thorn, but do not write the time derivatives
Lapse and Shift. Deborah, MacLachlan does write it back. Lean at
Illinois, folks were working on something similar, Roland knows how to
do this. Something about the time stepping. Hector, tried adding
tensors to the Kranc file and stored them, whatever was done to write
them to ADMBase, but see NaNs even though the evolution code does run
normally. Maxwell, Baikal has a similar problem with dt_alpha and use
the right hand side, some subtlety on the iteration, because what was
saved is a fourth-order RK step.
https://einsteintoolkit.org/thornguide/EinsteinAnalysis/CCE_Export/documentation.html
** When is the developer hack-a-thon? Peter, maybe in two weeks.
Next Meeting, Thursday, 7 August 2025.
https://docs.einsteintoolkit.org/et-docs/Meeting_agenda
fyi, bill gabella
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