Attending: Steve B, Bill G, Peter D, Atul K, Roland H, Zach E, Yosef Z, Maria H, Miguel G, Helvi W
Chair: Steve B Minutes: Bill G
* LSU Online ET Workshop https://www.cct.lsu.edu/Einsteintoolkitworkshop%C2%A0 https://www.youtube.com/playlist?list=PLzB9aSNzlOE_LF3c-72ZEmi9sTPHSJu54
Seemed to work out okay. Need the tutorial server to re-boot automatically, some web pages do not really exit. Currently three users are using 123% CPU right now and likely not real. Did work well. Peters tutorial needs to work better than having an extra compiled executable.
** Transitioning from NDSLabs to just the LSU machine. Ask to re-point the DNS entry to LSU from NDSLabs. Also the core flexibility up to 48 cores is easy with the LSU system...on a single node. To use more you have to span multiple nodes, and that is possible.
** Post workshop survey? Have we done that with the other workshops? No one recalls a post workshop survey. Sounds like a good idea.
** Steve has money for in-person meeting next year...assuming things loosen up with the pandemic.
* Other Workshops
** No one knows about a European ET workshop and seems late to get one going.
** Barry Wardell Advances in Computational Relativity workshop at Brown University, Sep 9 to Dec 11, 2020. ET should be represented there. Zach and Peter are attending. https://icerm.brown.edu/programs/sp-f20/
** Helvi is organizing LISA Waveform Working Group, sometime 7-11 September, 2 or 3 days long. Online with Zoom. https://lisasymposium13.lisamission.org/
** KITP Santa Barbara Probing Effective Theories of Gravity in Strong Fields and Cosmology, Monday for three weeks, every day from 8 to 10am. Open and free since online. https://www.kitp.ucsb.edu/activities/greft20
* AMREX
Especially want to know how the GPU support works. It can but down not have to use CUDA unified memory. Do not have to worry about keeping track of the data movement. They have a heat equation example to can run on the GPU and does so seemlessly. You can tell, because you give them a lambda funciton that tells them how to run. Multiple MPI processes with one GPU all run ont he one GPU, but does try to spread them out. IT is possible to have some on the CPU and others on GPUs but not recommended by AMREX because of load balancing.
Zach, GPU related. The student that wrote a Latex to C code parser will be re-joining the efforts funded out of the gran and he will be working on GPU kernel output starting with CUDA and NRPy. Original plan is to look at NVidia sample codes, wave equation in 3D and build off of that. Steve, likes the idea of building on top of AMRex to have the most impact down the road. Zack, worried about speed-up if you do not get the finite difference equations right. Steve, the AMR is the hard part, need to do prolongation, restriction, and populate ghost zones and that is functionality you do not want to replicate. Zach, on the Kernel side generating the EEQs so that there is good performance seems the hard, important part. https://amrex-codes.github.io/
* Other topics - None
* Unanswered Questions - None https://www.einsteintoolkit.org/tools/unanswered.php
* Tickets - No discussion https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=...
For Review, no discussion https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=o...
* Volunteers
Chairs: Peter (Aug 20), Zach (Aug 27) Minutes: Maria (Aug 20), Roland (Aug 27)
* Anything else
Maria, do analysis and post-processing work? https://docs.einsteintoolkit.org/et-docs/Analysis_and_post-processing%C2%A0 Roland, It is just a list and gets updated. Wolfgang K's PostCactus was just linked there, should be good. SimulationTools works. But we do not test these tools and even check that they still exist. Steve, should we check those tools? Roland, No. Bill, At least check the links maybe.
Atul, Binary BH gallery, made a branch on GIT and updated the index file for that page. Atul, needs to be checked? Ticket? Maybe not, but link to ET bitbucket, as a branch, https://bitbucket.org/einsteintoolkit/www/branch/BBH_Gallery_test_2020_Augus... , click on View source, upper right.