Present: Steve B, Bill G, Roland H, Peter D, Peter S, Atul K, Mario GA, Federico C, Miguel G, Antoni RB, Yosef Z, Liu H, Zach E, Maria H
Chair: Steve Minutes: Bill * gcc 10 issues [RH] RH, good news collected bits and pieces for compiling on gcc 10 and gfortran 10 and working on his workstation, patch to flesh, patch to cactus test repos, to event horizon finder, patches to GRHydro and XXX due to inconsistent types, more wrong than before but at least consistent, so the compiler is happy, LAPACK to newest version, patch to HDF5 that we check out, compiles and running the testsuite on many machines. We can backport these changes. This is the most trouble with a new compiler release. Have had compilers change on us, like gcc 4 to 5 where inline syntax changed. These seems to be the worst compiler upgrade we have had. ** 2403, https://bitbucket.org/einsteintoolkit/tickets/issues/2403 ** also affects CCTK_Reduce subroutines which is already incorrect F77 since they are variadic functions which FORTRAN never supported. Real world examples where this fails are known and were reported in 2004, http://cactuscode.org/pipermail/users/2004-September/001224.html by Roberto de Pietri. ** also affects EOS_Omnik, GRHydro [RH] * reviewers for proposed inclusions [RH] ** ReadInterpolate https://github.com/rhaas80/ReadInterpolate.git thorn ticket 2416 https://bitbucket.org/einsteintoolkit/tickets/issues/2416 no reviewer Takes 3d output from cactus and interpolates onto a different cactus grid. Uses AI Local Interp and not much internals of Cactus. Is a testsuite but no good documentation. Yosef is interested in this thorn and could review. Steve B wants to come up with Obscure Cactus Knowledge question for the meetings. Educational and spreads the knowledge base, should encourage humorous answers from us illiterati. ** POWER https://git.ncsa.illinois.edu/elihu/Gravitational_Waveform_Extractor ticket 2413 https://bitbucket.org/einsteintoolkit/tickets/issues/2413 Zach is reviewer waveform extractor (or its post-summer versions) [RH] ** con2prim methods https://arxiv.org/abs/1712.07538 ticket 2414 https://bitbucket.org/einsteintoolkit/tickets/issues/2414 Maria is reviewer [RH] Other groups are aiding these methods, like Federico Cipoletta to GRHydro, and Wolfgang XX is also working on these methods. Wolfgang's method has a proof of solution to roots...if it has a solution. ZE, often with AMR the conservatives can be ill-valued. His code has a lot of dependencies, Boost, Ninja, etc. ZE, the ideal interface for any GRMHD code is not a con2prim solver that does everything at all points, but one where you call it and it does it at one point. Convenient if you can do it in one OpenMP loop, so the point-by-point is better. Suppose it fails to find a root, if it fails fall-back to another method. Make the interface a point-wise method. RH agrees. But point-wise is maybe the other extreme, you may want that it takes a 1D array of data and then flags individual SIMD-parallelization a Newton-Raphson method. ZE, in some cases it is faster to us a quartic solver in some cases. RH, if this is a summer project for other groups with an end time, suggest waiting until the end of summer to see what their results are. ** NRPyPN https://nbviewer.jupyter.org/github/zachetienne/nrpytutorial/blob/master/NRPyPN/NRPyPN.ipynb ticket 2417 https://bitbucket.org/einsteintoolkit/tickets/issues/2417 no reviewer Steve says he might review this, and Peter D says he can help. ZE, has made a couple of modifications. And Antoni RB has shared their Mathematica notebook with Zach and testing NRPyPN and has not found any errors. Techniques in the two efforts is different, particularly the radial component to inject in two punctures. Useful with permission, to copy the method from the Antoni et al. notebook. ARB, will look at NRPyPN next week and compare with our expression. There is some freedom in some coefficients, but in the end Zach's method will work better in some parts of parameter space, and will compare. * gallery testing: tasks https://bitbucket.org/einsteintoolkit/tickets/issues?kind=task&milestone=ET_2020_05 [RH] ** BNS: Shawn Rsofsky (UIUC). In progress, needs to be uploaded, some differences post-merger. Shawn has done the simulation and plots but has not uploaded the data. RH re-ran it and does get the same waveforms, so the plots will not change. **BBH: Peter Schaffarczyk (KEIL), Atul Kedia (Notre Dame) in progress Peter S, took more time than expected. Configure a new machine in Berlin. Is over with same time, and working on the graphics and figures. Gnuplot graphics are finished. Made afigure of the horizons and looks a little different than the main page and discussing that. Atul, Figures for Curvature Scalars is taking some time, and Ian Hinder is advising. Focus mainly on the graphics. * test.cactuscode.org issues https://github.com/EinsteinToolkit/cactuscode.org/issues?q=is:open+is:issue+label:bug [SB] Nine critical issues at the above link. SB advocates for not have the Link to Live Wavetoy Example, https://github.com/EinsteinToolkit/cactuscode.org/issues/17 . General agreement. RH, fine to remove Live example, may on the other hand take the 1D scalar wave equation into a Jupyter notebook and run on the tutorial server. JPEG thorn should still work. Have a cell that opens the Jpeg file. SB says had trouble compiling it. SB, it would be nice to grow our collection of notebooks for tutorials in general. * Online ET Workshop https://www.cct.lsu.edu/Einsteintoolkitworkshop [SB] SB, not having an in-person event in August, very minimally we should have a training for new users. Live instructors. Good to have some talks too, work being done with the toolkit, state of AMRex at that time. Looking for help and suggestions. ZE, would student talks be good? Have a student working on ETK. SB, that would be great. Like to see NRPy tutorials. ZE, have a collection of tutorials about constructing thorns. SB, think about things you would like to present. Putting together an agenda. For online event maybe 3 hours a day is the limit. * Next chair(s) and minute taker(s) 6-25 Chair Peter S.; Minute taker Roland 7-02 Chair Roland; Minute taker Steve * Other issues? MH asks about con2prim. RH, Univ. of Arizona talking with Zach about Illinois GRMHD code modifications. Will wait for results at end of summer. MH your (SB) Christmas Tree? SB, too lazy to take it down (and put back up?)---so keep it unplugged until Christmas time. ZE, Quick update, recent update bug fix to Baikal on very special numbers of API process there was an interface with the boundary thorn that caused an exit and that is fixed. Also other issue that with gcc 9+ Bailkal takes a long time to compile. So refactored the code and properly doc-tested and had one successful expt with scalar wave with calculation not done inline but by function call and do not see a performance hit. Hopefully next week can report that it is compiling fine/faster on gcc 9+ . * unanswered questions on mailing list https://www.einsteintoolkit.org/tools/unanswered.php No unanswered email found. * open tickets sorted by update time https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=new&sort=-updated_on Tkt 2418 https://bitbucket.org/einsteintoolkit/tickets/issues/2418/have-declare_cctk_arguments_checked-hide not entirely clear what you want the macro to do, discuss offline. RH, intended as a discussion item, could add extra checks to Cactus. * tickets ready for review https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open&sort=-updated_on&q=Please%20review --bill e.g. -- ===================================== William Gabella Research Assistant Professor Department of Physics and Astronomy Vanderbilt University Nashville, TN USA [email protected] (o) 615-343-2713
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