Users November 2020

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Meeting Minutes 2020-11-19
by Gabella, William E 19 Nov '20

19 Nov '20

Present: Samuel C, Bill G, Roland H, Peter D, Miguel G, Zach E, Steve B, Yosef Z, Maria BH, Ken S Chair: Samuel C Minutes: Bill G * SPEC benchmark contribution [https://bitbucket.org/einsteintoolkit/tickets/issues/2470 task] [RH, SB] Steve, Assume no one has done anything yet, but to keep on the agenda. Should start in December. * upcoming release planning (1.5 weeks to go, -1 weeks to feature freeze, -1 weeks to have everything reviewed) [RH] Roland, weeks to go, freeze was last week, no more changes. Name is as below. Nov 30th is the release, Monday after Thanksgiving. Gallery examples, two are finished and uploaded, BNS and scalar wave example. Work by Miguel and Steve. Miguel, has uploaded everything. Steve, trying to get the Mathematica setup right. Needs to have a couple of different packages installed and X windows. Have not had luck with LSU running X11 back to his machine. Will try to get around any firewalls, or go into the office. Tried downloading to laptop on Windows partition will not run SimulationTools executable from Windows. Steve wants a Python script to make the plots. Done in the next week. Bill, has run Poisson and looks fine. Made the Visit plot. ** release name: DeWitt-Morette https://en.wikipedia.org/wiki/C%C3%A9cile_DeWitt-Morette Besides physics and mathematics, she is famous for starting the Les Houches School of Physics, https://www.houches-school-physics.com/en/ . ** release date: November 30th ** Gallery test runners search [[Release Details]] [RH] *** [https://bitbucket.org/einsteintoolkit/tickets/issues/2175/test-single-stabl… Single, stable neutron star] [Miguel Gracia] (done) *** [https://bitbucket.org/einsteintoolkit/tickets/issues/2174/test-multi-patch-… Multi Patch Scalar Wave Equation] [Rahime Matur] (done) *** [https://bitbucket.org/einsteintoolkit/tickets/issues/2173/test-poisson-equa… Poisson equation] [Bill Gabella] (in progress) *** [https://bitbucket.org/einsteintoolkit/tickets/issues/2176/test-binary-neutr… Binary neutron star] [Beyhan Karakaş] (done) *** [https://bitbucket.org/einsteintoolkit/tickets/issues/2172/test-binary-black… Binary black hole GW150914] [Steve Brandt] (in progress) ** release testsuite [http://einsteintoolkit.org/testsuite_results/index.php status] Roland, Not a lot of news. Did re-run on supported clusters, fixed the two punctures failure, it required running with higher resolution. Fixed a bug in Carpet's flipped in one direction. Affected the PETSc test on Queen Bee. Golub cluster has the largest number of failures, is using Intel and Slurm. Stampede does better than Golub. Maybe Intel compiler is defaulting to more agressive compilation. Roland, drafted a release announcement and Maintainers should have a copy. Please read and make comments. Two persons are new: Jonah Miller (doc Kranc) and Matthew Ely (Llama support). If there are others please tell Roland so he can get permissions and their names in the Zenodo and citation. ** [https://bitbucket.org/einsteintoolkit/tickets/issues?milestone=ET_2020_11&s… Tickets marked for the upcoming release] ** [https://bitbucket.org/einsteintoolkit/tickets/issues?kind=bug&priority=majo… Open bugs of severity major or worse] Roland, Tkt #2479 has existed for some time and .. You can depend on parameters of Thorns that are not active, which it should not. Saw in some of the testsuite tests. Thorn needed to compile even if not used in calculation. Not a crucial bug. * [https://www.einsteintoolkit.org/tools/unanswered.php unanswered question on mailing list] / [https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=new… open tickets sorted by update time] / [https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open… tickets ready for review] * any other business Steve, we are not meeting next week, Thanksgiving in the US. Next meeting Thursday December 3rd---Roland is chair and Miguel is minute taker. Zach, LaTeX parser update with Ken. Working on parsing the BSSN equations as exist in Baumgarte's Spherical NR and Baikal. Mostly functionally where we need to be. Working on the documentation. Also a nice Unit Testing infrastructure---cannot rely on Sympy simplification being very deterministic, so created a novel method involving hashing symbols into high precision numbers. Using Sympy's multiprecision math. Used to evaluate that expressions are equivalent. Roland, Probing with floating point numbers, what about exact math, fractions, etc. Zach, good idea. -- ============================== William Gabella Research Assistant Professor Department of Physics and Astronomy Nashville, TN USA (o) 615-343-2713

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Fw: Reminder: Postdoctoral Research Opportunity at the Center for Artificial Intelligence Innovation
by Roland Haas 18 Nov '20

18 Nov '20

Dear colleagues Thank you for your enthusiastic response to this job opportunity. If you have not already done so, please share this link to students or postdocs interested in AI and innovative computing. https://ai.ncsa.illinois.edu/news-events/2020/10/postdoctoral-researcher/ Deadline for application: 1 December, 2020. Note that the search will continue until the position is filled. Kind regards Eliu > On Oct 27, 2020, at 12:01 PM, Huerta Escudero, Eliu <elihu(a)illinois.edu> wrote: > > Dear colleagues > > The NCSA Center for Artificial Intelligence Innovation and the High Energy Physics Group in the Department of Physics at the University of Illinois at Urbana-Champaign invite applications for the position of postdoctoral researcher. > > The selected candidate will be mentored by an interdisciplinary team of researchers—Eliu Huerta, Daniel S. Katz, Vlad Kindratenko, Mark Neubauer, and Zhizhen Zhao—at the interface of physics, artificial intelligence (AI), computer and information science, open science, and scientific software and data to lead the definition and application of findable, accessible, interoperable, and reusable (FAIR) principles to artificial AI models and data in the context of high energy physics. > > Deadline for application: 1 December 2020 > > To learn more about this opportunity, please visit the website https://ai.ncsa.illinois.edu/news-events/2020/10/postdoctoral-researcher/ > > Please share this information with potential candidates. > > Kind regards > > Eliu Huerta > Director, Center for Artificial Intelligence Innovation > Head, Gravity Group > Senior Research Scientist > National Center for Supercomputing Applications > Associate Research Professor, Departments of Physics & Astronomy > Faculty Affiliate, Computational Science and Engineering > Faculty Affiliate, Illinois Center for Advanced Studies of the Universe > University of Illinois at Urbana-Champaign > -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://pgp.mit.edu .

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 16 Nov '20

16 Nov '20

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

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About cctk_time
by Jay Vijay Kalinani 12 Nov '20

12 Nov '20

Dear all, I am trying to perform a magnetised TOV simulation using Einstein Toolkit and Spritz GRMHD code. In particular, currently I have a subroutine that adds a dipolar magnetic field to the TOV star after its initial data has been generated via TOVSolver thorn. Within this subroutine, I have added the following lines that print the 'cctk_time' value as: character(len=200) warnline WRITE( warnline, '( "cctk_time: ", g16.7)' ) cctk_time call CCTK_INFO(warnline) This subroutine is scheduled in HydroBase_Con2Prim after Con2Prim step. And I get the following lines in the .out file as: ......... INFO (TOVSolver): Integrated TOV equation INFO (TOVSolver): Information about the TOVs used: INFO (): TOV radius mass bary_mass mass(g) cent.rho rho(cgi) K K(cgi) Gamma INFO (): 1 8.12502 1.40016 1.50618 2.78e+33 0.00128 7.92e+14 100 1.45e+05 2 INFO (TOVSolver): Not using old matter initial data INFO (TOVSolver): Done interpolation. INFO (Spritz_DipoleAndAtmo): cctk_time: 0.000000 INFO (Spritz_DipoleAndAtmo): Adding a poloidal magnetic field to the TOV star on reflevel 0 INFO (Spritz_DipoleAndAtmo): Adding atmo to the TOV star on reflevel = '0' INFO (Spritz_DipoleAndAtmo): cctk_time: 0.000000 ----------------------------------------------------------------------------------------------------------------------------------- Iteration Time | ADMBASE::alp | HYDROBASE::rho | HYDROBASE::press | SPRITZ::B_norm | minimum maximum | minimum maximum | minimum maximum | minimum maximum ----------------------------------------------------------------------------------------------------------------------------------- 0 0.000 | 0.6698612 0.9603815 | 5.827798e-11 0.0012800 | 0.0000000 0.0001638 | 8.399814e-09 0.0000399 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.3906250E-01 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.3906250E-01 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.7812500E-01 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.7812500E-01 1 0.078 | 0.6698612 0.9603833 | 5.827814e-11 0.0012799 | 0.0000000 0.0001638 | 8.294987e-09 0.0000395 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.1171875 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.1171875 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.1562500 INFO (Spritz_DipoleAndAtmo): cctk_time: 0.1562500 2 0.156 | 0.6698612 0.9603850 | 5.827829e-11 0.0012797 | 0.0000000 0.0001638 | 8.294994e-09 0.0000390 .......... The simulation is performed in uniform grid with dx=dy=dz=0.3125, time::dtfac = 0.25 and HydroBase::timelevels = 2. As you may see from the output lines, in between iteration 0 which is at cctk_time=0.0 and iteration 1 which is at cctk_time=0.078125, there is an intermediate time step with 'cctk_time=0.0390625' when the subroutine is called. I was hoping to understand better why this intermediate time step exists between two consecutive iterations, and if there is any documentation I could look at. Any help would be much appreciated. Thank you very much. Sincerely, Jay Kalinani

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carpetcode.org on Internet Archive
by Gabella, William E 12 Nov '20

12 Nov '20

Found a copy of the carpetcode.org on the Internet Archive Wayback Machine at https://web.archive.org/web/20200924195200/https://carpetcode.org/ This might be useful in any updating or transitions. Erik's bitbucket code is at https://bitbucket.org/eschnett/carpet/src/master/ FYI, bill e.g. -- ============================== William Gabella Research Assistant Professor Department of Physics and Astronomy Nashville, TN USA (o) 615-343-2713

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Minutes for Nov 12, 2020 Einstein Toolkit Telecon
by Zach Etienne 12 Nov '20

12 Nov '20

Present: Zach, Steve, Peter, Beyhan, Jay Kalinani, Ken Sible, Liu Haoyang, Maria Hamilton, Miguel Gracia, Roland, Sam Cupp, Bill Gabella, Yosef Carpetcode.org server transfer -- Steve warns if we transfer to LSU, the mailing lists will break. Looking into a workaround. NRPyPN vote for inclusion: Roland -- Used for setting TwoPunctures parameters for binary black hole initial data. Reviewed positively by Peter. Roland had concerns about exposing the user to the inner workings of NRPyPN that should be hidden. Zach fixed those in the past 12 hours. Zach says he still needs to add a doc/documentation.tex file stub that points to the actual (Juptyer) documentation. NRPyPN received majority approval for inclusion. Release planning: Roland -- No *major* issues for which there are tickets of which we are aware. Testsuites: Still pass, some oddities are observed with TwoPunctures that can disappear when Ofast compiler flag is changed to e.g., O2. Gallery tests: Roland -- Multipatch scalar wave finished. Others need to be done in the next 2 weeks. Steve says he hopes to get to his next week. Beyhan too. Unresolved messages on mailing list: None to report. Other business Steve: Don't forget about SPEC benchmark! Roland: Recordings of Erik, Zach, & Steve's Brown ICERM workshop tutorials have been posted on the Einstein Toolkit homepage Roland: UIUC postdoc application for Einstein Toolkit development is due soon (Dec 1)! Jay Kalinani: TOV simulation using new Spritz code. When adding a dipolar magnetic field to the star, there is some confusion about the behavior of cctk_time. There's a desire to not store RK intermediate values of cctk_time to cctk_time itself. Zach suggested that a local variable could be defined that simply outputs cctk_iteration*dt if desired. Roland had some comments about scheduling such a routine. Chairs/Minute Takers for upcoming meetings: Bill -- Minutes Nov 19 Sam -- Chair Nov 19 Miguel Gracia -- Minutes Dec 3 Roland -- Chair Dec 3 -Zach * * * Prof. Zachariah Etienne Physics & Astronomy Dept. West Virginia University http://astro.phys.wvu.edu/zetienne/ http://blackholesathome.net <https://blackholesathome.net>

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Postdoc positions at UIUC
by Helvi Witek 11 Nov '20

11 Nov '20

Dear all, we are opening two postdoc positions in numerical relativity at the University of Illinois in Urbana-Champaign (UIUC). The application deadline is 1 December 2020. You can find detailed information in our announcements: https://hyperspace.uni-frankfurt.de/2020/09/30/postdoctoral-postion-with-fo… https://hyperspace.uni-frankfurt.de/2020/09/14/postdoctoral-research-positi… We would greatly appreciate if you would share this information with potential candidates. Best wishes Helvi -- --------------------------------------------- Dr. Helvi Witek Assistant Professor Department of Physics University of Illinois at Urbana-Champaign 247 Loomis Lab 1110 W Green St Urbana, IL 61801 ---------------------------------------------

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 09 Nov '20

09 Nov '20

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

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Automated code generation with correctness proofs
by Erik Schnetter 06 Nov '20

06 Nov '20

Since we're discussing automated code generation at the moment, and since I just learned about Spiral, let me point you to <http://spiral.net/index.html>. Spiral is an automated code generator for compute kernel that starts from a mathematical description in Coq, an automated theorem prover, and works from there all the way down to efficient assembler code. (I'm not suggesting to use it for the Einstein Toolkit, since it's very important for us that the generated code ties nicely into Cactus.) However, being able to automatically go e.g. from the definition of a Fourier Transform to highly efficient machine code is quite exciting. -erik -- Erik Schnetter <schnetter(a)gmail.com> http://www.perimeterinstitute.ca/personal/eschnetter/

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NRPyPN: Vote during November 12 Telecon
by Zach Etienne 05 Nov '20

05 Nov '20

Hello everyone, As we discussed during our weekly Einstein Toolkit telecon today (Oct 29), we will be having a vote on November 12 to determine whether to include NRPyPN into the Toolkit. Proposing a vote such as this requires at least one week notice sent to the users mailing list. This email serves as that notice. Please respond to this message if you have any objections to including NRPyPN in the next (late-November) Toolkit release, so we can discuss. Thanks everyone, and we hope to see you during our next telecon (Nov 5)! -Zach * * * Prof. Zachariah Etienne Physics & Astronomy Dept. West Virginia University http://astro.phys.wvu.edu/zetienne/ http://blackholesathome.net <https://blackholesathome.net>

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