Users October 2024

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16 participants
25 discussions

Meeting minutes for 2024-10-17
by Boyer, David (dboyer＠uidaho.edu) 18 Oct '24

18 Oct '24

Present: Peter, Steven, David, Leo, Lucas, Samuel Cupp, Zach Chair: Peter Diener Minutes: David Boyer ET release: Roland needed to step out. Did not talk about the release schedule this time. ET thorns: David has made the associated changes to TOVola commented by Zach and Roland. Is ready for the official review with Maxwell Rizzo. Unanswered questions: No unanswered email found Tickets: #2814 – Lucas tensortypealias creating a table for symmetries. Fixing interface.ccl #2520 – Gallery examples with a more typical gauge have been made and are ready to be updated on the site. David just actually has to make the pull request now. #2787 – Sorting algorithm for the .th file in releases. Members at meeting had no objection to implement an algorithm to sort alphabetically. #963 – Improve Machlaclan Accuracy – Peter and Zach want to compare some evolutions. #2786 – Ask Eric to provide a unified base for grid coordinates in CarpetX. Just single test case causing issues with Multipole. #2772 – Kadath thorns linking issue. Samuel Tootle will be poked. David

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Asst/Assoc Professor of Applied Mathematics & Artificial Intelligence | Rochester Institute of Technology
by Carlos O. Lousto 16 Oct '24

16 Oct '24

https://sjobs.brassring.com/TGnewUI/Search/home/HomeWithPreLoad?PageType=Jo… Distinguished Prof. Carlos O. Lousto

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 16 Oct '24

16 Oct '24

Hello, Please consider joining the weekly Einstein Toolkit phone call at 9:00 am US central time on Thursdays. For details on how to connect and what agenda items are to be discussed, use the link below. https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call --The Maintainers

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Meeting minutes for 2024-10-10
by Leo Rosa Werneck 16 Oct '24

16 Oct '24

Hi all, Apologies for the delay on sending this. Here are the minutes from last week’s meeting. Cheers, Leo Present: Lucas, Leo, Roland, Zach, Johnny, Maxwell, Bill, David Chair: Lucas Minutes: Leo ET Release: * TOVola: several review comments made. Zach updated code. David is working on updating the code and will inform Maxwell once he's done, but will keep the comments in mind in case they are still relevant. David asked: should TOVola be populating previous time levels? Roland suggested looking at TwoPunctures and Meudon thorns and to keep in mind all 3 drivers (PUGH, Carpet, and CarpetX). * GRHayL: Roland wants to learn how to do code generation to ensure the version of any NRPy-generated code in NRPy remains consistent as it makes its way in the Einstein Toolkit. Unanswered Questions on the Mailing List: * Announcement: open postdoc position in numerical relativity at UIUC. Source: https://my.physics.illinois.edu/join/#id1900 Open Tickets: * NRPyEllipticET: LaTeX documentation using extra package. Sam pushed a fix. Sam also fixed a similar issue in a WVU thorn documentation. Ready for Review: * #2820: Lucas is looking into it. * #2814: Not really ready for review, lots of ongoing development. * #2179: Thorn's output is junk; Steve is looking into it. * #2786: Might require intervention from Erik in CarpetX's coordinate thorn. Next Chair: Peter Next Minutes: Roland ------ Leonardo R. Werneck, Ph.D. Postdoctoral researcher Office EP 314 | Department of Physics | University of Idaho 875 Perimeter Dr. MS 0903 Moscow, ID 83844-0903, USA leonardo(a)uidaho.edu <mailto:leonardo@uidaho.edu> https://leowerneck.github.io <https://leowerneck.github.io/>

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 14 Oct '24

14 Oct '24

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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Repost: Postdoctoral Research Position in Numerical Relativity and Strong Field Gravity at Urbana Champaign
by Roland Haas 10 Oct '24

10 Oct '24

Re-posting this since it seems the mailing initial posting may have gotten lost on the way for some recipients. Dear all, we are inviting applications for a postdoctoral research position at the University of Illinois Urbana Champaign. The focus of the position will be numerical relativity and strong field gravity. The successful candidate will work with Dr. R. Haas and Prof. H. Witek. Applicants should submit their application material (1) a curriculum vitae, including a list of publications (2) a research statement (limited to 3 pages, 1 inch margin, 11-12pt) containing a summary of previous and current research, and future plans (3) contact information for three referees who will be asked to write letters of recommendation by 1 December 2024 here: https://my.physics.illinois.edu/join/#id1900 Please find the detailed announcement below. Best wishes Helvi -- Announcement: The Illinois Relativity Group at the Department of Physics and the National Center for Supercomputing Applications (NCSA) at the University of Illinois Urbana-Champaign invites applications for a postdoctoral research associate position with a focus on numerical relativity in strong field gravity, neutrino radiation transport and numerical methods in astrophysics. The successful candidate will have a strong background in scientific software development using parallelization frameworks similar to MPI or related expertise. Expertise in GPU programming will be beneficial. The appointment is to commence in Fall 2025 and last for a two-year term with a potential extension to a third year. The postdoctoral associate is intended to partially work on developing a hybrid Monte-Carlo (particle) M1-Moment (fluid-like) neutrino transport scheme based on the Einstein Toolkit / CarpetX simulation framework as part of the E=mc2 project. This is a multi-institution collaborative project with collaborators at LSU, RIT, UIdaho, UTAustin, and UWYO to develop numerical infrastructure and methods. E=mc2 targets simulations of binary neutron star mergers including all relevant microphysics to obtain astrophysically relevant predictions of properties of the merger process and the subsequent evolution of the merger remnant. The successful candidate will join Dr. Roland Haas, Prof. Helvi Witek, and their team (including postdoc Dr. Deborah Ferguson, six graduate students and undergraduate students). The successful candidate will become a member of the Illinois Relativity Group (which includes Prof. Stu Shapiro, Prof. Nico Yunes, Asst. Prof. Hector O. Silva, Research Professor Antonios Tsokaros and Research Professor Elena Koptieva). They will also become a member of the Illinois Center for Advanced Studies of the Universe (ICASU). While expected to be based in the the Department of Physics, the postdoctoral research associate will be able to interact and collaborate with researchers at NCSA, which currently hosts the largest GPU enabled supercomputer in the ACCESS-CI program and has active collaborations with researchers in parallelization frameworks (MPI, Charm++), machine learning, as well as numerical methods in the department of computer science and school of engineering. Interested candidates must have completed a Ph.D. in Physics, Astrophysics or a related field before the start date. They must submit their application package online here: https://my.physics.illinois.edu/join/#id1900 (Haas/Witek) Applicants are requested to submit (1) a curriculum vitae, including a list of publications (2) a research statement (limited to 3 pages, 1 inch margin, 11-12pt) containing a summary of previous and current research, and future plans (3) contact information for three referees who will be asked to write letters of recommendation The deadline for applications and all letters of recommendation is December 1, 2024, for full consideration. The anticipated starting date of the position is August 15, 2025, though other starting times may be negotiated. Please contact Roland Haas (rhaas(a)illinois.edu) and Helvi Witek (hwitek(a)illinois.edu) if you have any questions about the position itself, or Deanna Frye (ddebord(a)illinois.edu) if you have any questio ns about the application form. Candidates from underrepresented groups in STEM are particularly encouraged to apply. The University of Illinois System is an equal opportunity employer, including but not limited to disability and/or veteran status, and complies with all applicable state and federal employment mandates. Please visit Required Employment Notices and Posters (https://www.hr.uillinois.edu/cms/one.aspx?portalId=4292&pageId=5705) to view our non-discrimination statement and find additional information about required background checks, sexual harassment/misconduct disclosures, and employment eligibility review through E-Verify (https://e-verify.uscis.gov/web/media/resourcesContents/E-Verify_Participati…). Applicants with disabilities are encouraged to apply and may request a reasonable accommodation under the Americans with Disabilities Act (2008) to complete the application and/or interview process. --------------------------------------------- Dr. Helvi Witek Associate Professor Department of Physics University of Illinois at Urbana-Champaign 247 Loomis Lab 1110 W Green St Urbana, IL 61801 ---------------------------------------------

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Schedule options and uninitialized refinement levels
by Jordan Nicoules 10 Oct '24

10 Oct '24

Dear all, I am writing to try to clarify a few issues that I've been facing regarding the schedule options "global loop-local" and "local" for an analysis thorn. I have a thorn with a group scheduled as schedule GROUP UAv_Analysis_Group at ANALYSIS after AHFinderDirect_maybe_do_masks In this group, a function is dedicated to computing some grid functions: schedule UAv_Analysis_gfs in UAv_Analysis_Group { LANG: Fortran SYNC: dE_gf_volume SYNC: dJ_gf_volume SYNC: quadrupole_gf_volume SYNC: density_rho SYNC: density_p } "Calculate grid functions" I encounter some issue (described below) when using, in this schedule block, the option OPTIONS: global loop-local instead of the default "local". I was wondering about the "global loop-local" option because, in thorn ADMMass, it seems like the way to go (the schedule.ccl file contains comments about it). Using "local" yields the expected behavior, at least in the configurations which I have experimented with. Since I don't have a fine understanding of these options and how they affect the schedule, I'm willing to keep "local", and yearn to understand how to choose properly. The problem that I'm facing with "global loop-local" is the following (all other things identical). I'm using a parameter file with Carpet, having 1 center and some refinement levels. My UAv_Analysis_gfs function contains an initial if statement that returns directly if cctk_iteration is not a multiple of a parameter do_analysis_every. The function sets a grid function called density_rho. At the initial time, only the finest refinement level has initialized values. For later iterations, if do_analysis_every = 2^N, then for the output of density_rho, the finest level is initialized, the next N levels are uninitialized, and the remaining levels are initialized. For instance, with CarpetRegrid2::num_levels_1 = 9 and do_analysis_every = 8, level 8 has values, levels 7, 6 and 5 don't, and levels 4 to 0 have values (except at iteration 0). In the extreme case do_analysis_every = 1, all levels have values. In the extreme case do_analysis_every = 256 (i.e every coarse level time step), only level 8 has values. These issues do not occur with option "local". Thank you for the insight and explanations that you can provide. I'm at your disposal for more information or details that could be useful. Sincerely, Jordan Nicoules

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 09 Oct '24

09 Oct '24

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Plotting all refinement levels using Kuibit
by José Ferreira 09 Oct '24

09 Oct '24

Dear toolkit community, I’m struggling to find a way to plot a 1D quantity in Kuibit without merging the different meshes originated from the mesh refinement. As a workaround, I have made a Python script that reads the file of a grid function and plots every point along the axis and its corresponding value. I can share this script if somebody is interested, but it is not very good as it breaks once you use checkpoints and has hardcoded paths. However, it gets the job done, as you can see in an example plot below, where it is hopefully obvious that there is an increase in the number of points as z approaches 0. Obviously, a solution that uses Kuibit would be much better. However, I cannot come up with such a solution and so I’m writing this e-mail. From the documentation, the object that represents the simulation data (including the mesh refinement levels), is the |HierarchicalGridData|, and I know how to go from a grid function to this object. For instance, to get the |HierarchicalGridData| that represents the real part of a scalar field along the x-axis at t=0, we do |sd = SimDir("<output>") gf = sd.gf phi1=gf.x["phi1"].get_time(0) | All I have to do now is plot this somehow. As it turns out, this is impossible, because according to the documentation We cannot plot directly this object, because it is a complicated object. To plot it, we have to merge the refinement levels to a single |UniformGridData|. We can do this with |refinement_levels_merged()|. But, all of the information regarding the mesh refinement levels is here, so it should be possible to extract this information and plot it, right? Looking at the methods and variables in |HierarchicalGridData| I came up with nothing. Does anybody have a solution to this? Thank you in advance, Best Regards, José Ferreira

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Installation error
by Stefanos Tsiopelas 08 Oct '24

08 Oct '24

Dear all, I am trying to install Einstein Toolkit on MacOS Ventura and at the last stage of the compilation I encounter this error: ld: library not found for -l/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/lib/libz.tbd collect2: error: ld returned 1 exit status However, when checking the location, the file is indeed there. To install the packages, I use homebrew. Attached is the config-info file. Kindest regards, Stefanos Tsiopelas Uniwersytet Wrocławski [cid:400ea55e-bee6-4608-92c4-b898fee1d63d]<https://uni.wroc.pl/>[cid:2f62d8e6-9fcf-4898-b3b2-7a02479b1a15]<https://uwr.edu.pl/inicjatywa-doskonalosci-uczelnia-badawcza>[cid:be632b3f-23e3-4ea2-9058-9dbfeadf0cd4] Wiadomość ta oraz wszelkie załączone do niej pliki są poufne i mogą być prawnie chronione. Jeżeli nie jest Pani/Pan zamierzonym adresatem niniejszej wiadomości, nie może Pani/Pan jej ujawniać, kopiować, dystrybuować ani też w żaden inny sposób udostępniać lub wykorzystywać. O błędnym zaadresowaniu wiadomości proszę niezwłocznie poinformować nadawcę i usunąć wiadomość.

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