Users December 2024

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Meeting Minutes 2024-12-19
by Bill Gabella 19 Dec '24

19 Dec '24

Minutes for the Einstein Toolkit, 20241219. https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call 9am CST Present: Steve B, Bill G, Roland H, Maxwell R, Leo Rosa W, Zach E Chair Steve, Minutes Bill Last meeting of the year. No meeting on the 26th December nor on the 2nd January. Next call is 9 January 2025. Steve, looking at MoL recently and it should work with CarpetX if someone provides linear combination. Roland wonders if tiling is a problem. Steve pushes back about traversing the schedule versus traversing the grid. Scratch variables are not grid functions in ODESolvers. Roland thinks it might well work. Steve, it would be another capability if people want it. MoL does have a linear combination routine if nothing overrides it. Roland, could make MoL use GPUs in this manner. * Simfactory issues on Anvil [RH] Roland, Maxwell looking into this. Simfactory for the release gave 1/70th the speed on Anvil. Maxwell used his files and it gave the expected performance. So something is off on the ones in the toolkit. Maxwell, my files are not public yet. The diff shows some simple changes, like modules which he does not expect to make a large difference, another difference is the amount of make jobs and default amount of nodes in the .ini file. Nodes is the max number of nodes the cluster has, a limit. CPU frequency is different too but is purely information. Make jobs 8 to 4 should not affect it. So seems that difference is in the modules. Roland asks about the OptionList, and expects the difference there. Roland, could be off in the runscript. Maxwell, my machine file use --mpi=pmpi2, was told to do that for some speedup, pins MPI ranks. Steve suggests changing to the other value. Roland, you need to Reconfig with scripts but will not re-compile anything, or copy by hand the runscript in config/sim . Maxwell, will run more tests to pin down the parameter that affects the runtime. * upcoming ET possible inclusions ** NewRadX boundary [CSC] Did not get the update into the previous release. Needs two changes, one change to CarpetX and the other to SpacetimeX. See ticket #2820. ** Z4c, high priority needs champion and reviewers [RH] Erik would like to have a co-champion and Roland can do that. Reviewers are Steve and Peter. See ticket #2748. ** BHaHAHA horizon finder [ZE] Zach, paper is being written, sections are finished. Finish the paper and up on Arxiv before the new year. So on track for the next release. ** CCE code to hook up to Spectre [RH] Cauchy Characteristic Extraction code, interpret the cauchy grid for spacetime evolution and on the null grid, and to ScriPlus that way. Deborah Ferguson and should be ready soon. ** possibly more modules for cosmology [RH] Roland, will check if Hailey has anything ready and can champion it. ** gallery examples for Canuda [CSC], Fishbone-Moncrief, IGM, GRHayL and others [RH] New gallery examples, two to contribute related to Chen and Deborah Ferguson, on axidilaton field part of Canuda but not the Toolkit. Like BNS relies on external package, Proca and Gallery thorns. It has a picture and text and estimates for runtime. Fishbone-Moncreif postponed until those thorns have been cleaned up. Roland, GrHayL or IGM, it would be nice to have gallery examples to make people aware of other codes in the Toolkit. Could be simple as BNS example, use with Illionis GMHD and Baikal. Zach, also do with BHaHAHA. Once McLachlan is updated with improvements, we can update. * unanswered question on mailing list https://www.einsteintoolkit.org/tools/unanswered.php Just advertisements. * open tickets sorted by update time https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=new… #2837 Building Einstein Toolkit: Roland, Build trouble on a cluster in Asia. Suggest commenting out thorns you do not use and re-run make thorn. Steve, have maybe run across something similar. Does he have pkg-config installed? Zach, reads like an Adios2 compile issue. Roland, this was fixed by installing cmake on the system...look lower in the ticket. Looks like libsz is missing. Roland, installing HDF5 usually fixes this. Ticket says solved libsz problem. Trouble on OpenSuse and Ubuntu still. Needs hdfs5-devel maybe. Roland, Zypper install helps. Zach, in the Ubunto log bulding with make -j 6 and it is not finding something. Too many makes in a parallel build can expose dependency issues and think that is the problem...maybe with the ADIOS2 build system. Recommends trying -j 1...and wait. Perhaps OpenSUSE is the same/similar issue. Steve, could be something funny with ADIOS2, Steve installs it first with Spack. #2835 add backtrace functionality from CarpetLib: Erik has reviewed part of it. Moved some of the code to CarpetX. Code same as in CarpetLib. Parameter files in test directory do not have output files, and testing segfault all end in failures...Toolkit test system should support expected failure as an outcome. This looks underway. #1566 Update Cactus autoconf: Roland will apply it 2024-12-26. #2807 Hydro_RNSID passes CFLAGS to LD: Roland will apply this after 2024-12-26. #2836 add support for different data types to GPU arrays: Roland, Erik found some needed fixes. About how the Poison value is handled, set memory to poison, etc. Can discuss the proper poison value. Steve, is it NAN17? Roland, currently NANxxx, can use anything. Add doubles, floats, ints, complex8 and complex16, etc, the ones that CarpetX supports. * tickets ready for review https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open… * Any Other Business Maxwell, discussed support for volume integrals in Kuibit on a Telegram channel. Steve uses Telegram heavily, communicate and to tell him about builds. Because it is using its own output, volume integral output is different than the standard Cactus output, so needs its own custom interpreter. Kuibit lets you do parsing flexibly. Gabrielle started by parsing headers for Kuibit. Zach, Python is a good language for this. In the Toolkit there are a lot of ways to do this. Needs to be able to interpret the strings and what are the important information. Zach, issue is the communication of the output you start with a full domain and then you have spherical volumes from that domain...support swiss cheese type topologies. Do not need to do too much in Kuibit. Maxwell, Gabrielle wanted to be able to change the configuration mid-run as people often do, so want to follow the mid-run changes in output. From Roland, a negative about Telegram https://www.bbc.com/news/articles/cvgrvw29x4jo "The social media platform Telegram uses an algorithm that promotes extremist content, a new study shared exclusively with the BBC has revealed." Next meeting 9 January 2025: Chair Leo Minutes Roland

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 18 Dec '24

18 Dec '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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PhD fellowships at SISSA
by Enrico Barausse 18 Dec '24

18 Dec '24

Dear Colleagues Please find below an open call for PhD fellowships at SISSA (Trieste, Italy). Apologies if you receive this more than once. Please feel free to forward to potentially interested parties Best wishes Enrico Barausse ----------------------------------------------------------------------- The gravitational-wave physics group at SISSA (Trieste, Italy) invites applications for PhD positions in gravitational-wave theory, source modeling, science interpretation and data analysis, to start in the fall of 2025. Successful candidates will join the GWSKy project, which an ERC Synergy Grant has recently funded. We are particularly interested in hiring creative and highly motivated candidates who can work collaboratively and independently in a vibrant, welcoming, and synergistic group. The ERC-funded project called "Making sense of the unexpected in the gravitational-wave sky (GWSky)" is led by PIs Enrico Barausse (SISSA, Trieste, Italy), Zvi Bern (University of California, Los Angeles, US), Alessandra Buonanno (Albert Einstein Institute, Potsdam) and Maarten van de Meent (Niels Bohr Institute, Copenhagen, Denmark). The aim of the GWSky project is to use gravitational-wave measurements by existing and future observatories on the Earth and in space as precision laboratories for fundamental physics, cosmology, and astrophysics. This includes the current LIGO-Virgo-KAGRA detectors, as well as the future ground-based observatories Cosmic Explorer and Einstein Telescope, and the space-based detector LISA. By leveraging the PIs and their team's expertise, the GWSky project aims to develop a groundbreaking framework capable of solving the highly nonlinear equations of Einstein's General theory of Relativity, creating waveform models with unprecedented accuracy, and translating these results into practical tools for interpreting the data. As a consequence, at SISSA we are looking at candidates in the following research areas: numerical-relativity simulations in General Relativity and alternative theories of gravity; environmental effects for binary systems; tests of General Relativity; gravitational-wave data analysis and machine learning; waveform modeling. Applications should be sent to *both* https://pica.cineca.it/sissa/phd-gwsky-2025/ and https://pica.cineca.it/sissa/phd-app-01-2025/ Please also see https://www.sissa.it/sites/default/files/2024-03/SISSA_IstruzioniCompilazio… for instructions. The hard deadline for applications is March 4 at 1300 Italian time.

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Tenure-Track Faculty Openings in Physics at the U. of Idaho
by Zach Etienne 16 Dec '24

16 Dec '24

Einstein Toolkit Community: The Physics Department at the University of Idaho is seeking to hire two tenure-track faculty members at the assistant professor level. We are looking for candidates who will establish impactful research programs in experimental, theoretical, or computational physics that complement or expand upon the department’s and College of Science’s existing strengths. Current departmental research includes astrophysics (such as numerical relativity), biophysics, condensed matter physics, nuclear physics, and planetary science. The college is also advancing initiatives in biomedical and bioengineering fields. Notably, the University of Idaho, currently classified as a Carnegie R2 institution, is projected to achieve R1 status by 2025, highlighting its commitment to research excellence. (For more information, see: https://tinyurl.com/2vn47vbs .) The new faculty members will mentor undergraduate and graduate students in the physics program. The University places a high priority on hiring faculty with diverse backgrounds, experiences, and perspectives. Instructional responsibilities typically include teaching one three-credit-hour course per semester at the undergraduate and/or graduate level. These courses support university-wide physics education and the department’s degree programs, which include B.A., B.S., M.S., and Ph.D. programs in physics. Scholarship responsibilities involve conducting research in physics, disseminating findings through publications in refereed professional journals and presentations at conferences, and securing external funding to support research activities. Outreach responsibilities include participating in community engagement activities and contributing to the professional physics community through scholarly efforts. Service responsibilities include serving on committees at the department, college, and/or university level. For more details and to apply (deadline: *Feb 3, 2025*), please visit the following link: https://apptrkr.com/5873186 -Zach * * * Zachariah Etienne Assoc. Prof. of Physics, U. of Idaho Adjunct Assoc. Prof. of Physics & Astronomy, West Virginia U. https://etienneresearch.com https://blackholesathome.net

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 16 Dec '24

16 Dec '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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Meeting minutes for 2024-12-12
by Lucas Timotheo Sanches 12 Dec '24

12 Dec '24

Attendees: Lucas (Minutes), Zachariah Etienne, Peter Diener, Roland Hass (chair), Steven R. Brandt, Leo Rosa Werneck, Maxwell Rizzo # Pre-agenda topics * Zach asked for updated citations for the new release on Zenodo. Roland did so right away. * SPEC v8: Steve reports that Cactus is still proceeding at being a SPEC benchmark. The SPEC team reports successfully compiling a severely reduced version of Cactus on Windows with MSVC. # "Canon" Release post-mortem * Roland's thoughts on this release were the following: He believes it was an "Okish release". In his opinion, we were delayed for too long (even though there are always delays). He stresses the importance of getting service accounts in repos so that people can create branches with these accounts. This should make it easier for contributors and release managers to make edits. He wants to clean it up, too many manual steps should be more automated. Judgment calls should also be reduced. * More updates for the gallery examples are still needed. # Upcoming release * Roland asked if any of the present would volunteer to be release manager assistant for the upcoming release. So far, there were none. * Codes for possible inclusion in the next release were discussed: 1. Z4c: Champions: Erik, Roland. Reviewers: Steve and Peter. 2. BHaHAHA: Champion: Zach, Review: Steve. 3. CCE data writer: Champion: Deborah Ferguson, Review: Peter Diener 4. New modules for cosmology: Hayley Macpherson needs to be contacted and asked if she has any code she would like to include. 5. More gallery examples: Roland suggested that we create more gallery examples for alternative codes that already exist in the toolkit, such as Fishbone-Moncrief, Canuda, Baikal and others. # Mailing list No emails. # Open tickets * 2836: Roland and Erik are reviewing it. * 2835: Roland suggests that anyone that wants backtrace in Carpet should review this ticket. * 2633: Peter apologizes for not having time to look at this last week and says he will take a look. * 963: Peter wanted to contact Zach to discuss the improvements, but got delayed. Zach reports he still needs to move some of the improvements to Baikal. # Tickets ready for review * No new updates on any specific ticket. * Maxwell Rizzo has reported an issue with the Anvil cluster. He reports that simfactory is producing invalid job ids when recovering jobs that are old but whose data still exists. Roland says there is a bug in simfactory when getting job IDs which may be related to this. He suggests artificially setting the job id in the properties.ini simfactory file to anything other. than -1, which signifies an invalid job. # Other topics * Zach initiated a discussion on the inconvenience of getting proper citations for individual thorns used during Cactus execution. This, he adds, may lead to codes being used without proper citation in application papers. He proposes that whenever Cactus runs, a bibtex file is emitted for the active thorns in the parameter file being run. This would help users note and remember to properly cite the papers of the codes being used. Roland pointed out that similar functionality was proposed (and never reviewed or accepted) in ticket 2254, which uses extra bibtex tags in formaline Zach argued that a solution using formaline may be easily disabled, as for instance, he dislikes using formaline for production builds as it takes a long time for it to run. Lucas suggested for Cactus to officially add .bib files (along with .ccl files) as an optional file in the definition of a Thorn. Users could then optionally include a .bib file in their thorn directories containing citation information. After that, either the flesh or an offline tool would read a parameter files' ActiveThorn list and concatenate the citations for each of the thorns used. The suggestion was liked, however Zach pointed out that simple concate- nation may not be enough, as some thorns may have overlapping citations. Steve pointed out that Piraha has a grammar for .bib files and can parse them. This should come in handy if parsing these files is necessary. To end the meeting on time, Roland suggested that we continue this discussion next week.

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 11 Dec '24

11 Dec '24

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The Twenty-Ninth Release of the Einstein Toolkit
by Roland Haas 10 Dec '24

10 Dec '24

Release Announcement Click here to read the announcement in HTML (with hyperlinks): https://einsteintoolkit.org/about/releases/ET_2024_11_announcement.html We are pleased to announce the twenty-ninth release (code name "Annie Jump Cannon") of the Einstein Toolkit, an open-source, community-developed software infrastructure for relativistic astrophysics. The major changes in this release include: One new thorn has been added: * TOVola -- solves the Tolman-Oppenheimer-Volkov equations for simple polytropes, piecewise polytropes, and tabulated equations of state. Updated thorns: * CarpetX -- many updates and new functionality * GRHayL -- support WENO5 reconstruction In addition, bug fixes accumulated since the previous release have been included. The Einstein Toolkit is a collection of software components and tools for simulating and analyzing general relativistic astrophysical systems. It builds on numerous software efforts in the numerical relativity community, including codes to compute initial data parameters, the spacetime evolution codes Baikal, lean_public, and McLachlan, analysis codes to compute horizon characteristics and gravitational waves, the Carpet AMR infrastructure, and the relativistic (magneto)hydrodynamics codes GRHayLHD, GRHayLHDX, GRHydro, and IllinoisGRMHD. Data analysis and post-processing are handled by the kuibit library. The Einstein Toolkit also contains a 1D self-force code. For parts of the toolkit, the Cactus Framework is used as the underlying computational infrastructure, providing large-scale parallelization, general computational components, and a model for collaborative, portable code development. The Einstein Toolkit uses a distributed software model. Its different modules are developed, distributed, and supported either by the core team of Einstein Toolkit Maintainers or by individual groups. Where modules are provided by external groups, the Einstein Toolkit Maintainers ensure quality control for modules included in the toolkit and help coordinate support. The Einstein Toolkit Maintainers currently involve staff and faculty from five different institutions and host weekly meetings that are open to anyone. Guiding principles for the design and implementation of the toolkit include: open, community-driven software development; well thought-out and stable interfaces; separation of physics software from computational science infrastructure; provision of complete working production code; training and education for a new generation of researchers. For more information about using or contributing to the Einstein Toolkit, or to join the Einstein Toolkit Consortium, please visit our web pages at http://einsteintoolkit.org, or contact the users mailing list users(a)einsteintoolkit.org. The Einstein Toolkit is primarily supported by NSF 2004157/2004044/2004311/2004879/2003893/2114582/2227105 (Enabling fundamental research in the era of multi-messenger astrophysics). The Einstein Toolkit contains about 400 regression test cases. On a large portion of the tested machines, almost all of these tests pass, using both MPI and OpenMP parallelization. Contributors Among the many contributors to the Einstein Toolkit and to this release in particular, important contributions to new and existing components were made by the following authors: * David Boyer * Erik Schnetter * Leonardo Werneck * Liwei Ji * Samuel Cupp * Steven R. Brandt * Terrence Pierre Jacques * Zachariah Etienne How to upgrade from Launda Release (ET_2024_05) To upgrade from the previous release, use GetComponents with the new thornlist to check out the new version. See the Download page (http://einsteintoolkit.org/download.html) on the Einstein Toolkit website for download instructions. The SelfForce-1D code uses a single git repository; thus, using git pull; git checkout ET_2024_11 will update the code. To install Kuibit, do the following: pip install --user -U kuibit==1.5.0 Machine notes Supported (tested) machines include: * Debian, Ubuntu, Fedora, Mint, OpenSUSE, and macOS installations with dependencies installed as prescribed in the official installation instructions * Anvil * Deep Bayou * Delta * Expanse * Frontera * Queen Bee 3 and 4 * Stampede 3 * Sunrise * Supermike Note for individual machines: * TACC machines: defs.local.ini needs to have `sourcebasedir = $WORK` and `basedir = $SCRATCH/simulations` configured for this machine. You need to determine $WORK and $SCRATCH by logging in to the machine. All repositories participating in this release carry a branch ET_2024_11 marking this release. These release branches will be updated if severe errors are found. The "Annie Jump Cannon" Release Team on behalf of the Einstein Toolkit Consortium (2024-11-29) * Roland Haas * Maxwell Rizzo * David Boyer * Domenica Garzon * Bing-Jyun Tsao * Lucas Timotheo Sanches * Peter Diener * Steven R. Brandt November 29, 2024

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 09 Dec '24

09 Dec '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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Expression of interest for postdoc positions in gravity theory and GW phenomenology at Sapienza University of Rome
by paolo.pani＠uniroma1.it 05 Dec '24

05 Dec '24

From: Paolo Pani <paolo.pani(a)uniroma1.it> To: undisclosed-recipients:; Subject: Expression of interest for postdoc positions in gravity theory and GW phenomenology at Sapienza University of Rome Date: Thu, 5 Dec 2024 17:36:03 +0100 Please share the following announcement with potentially interested candidates. %%%%%%%%% We expect to open several postdoctoral positions to work in the gravity theory and gravitational-wave phenomenology group at Sapienza University of Rome https://web.uniroma1.it/gmunu . Successful candidates will join the *FIS project 'ET-NOW: Fundamental Physics, Nuclear Physics, and Cosmology with the Einstein Telescope' *(PI: Paolo Pani) recently funded by the Italian Ministry for Research. Candidates with expertise in gravitational-wave modeling, numerical relativity, science interpretation and data analysis, and with interests in cosmology, nuclear, high-energy physics & gravity are particularly encouraged to apply. The appointment is for 2+1 years (extension subject to funding renewal and satisfactory performance), with a net salary competitive with international standards. All candidates must hold (or soon be completing) a Ph.D. in Physics. Although flexible, the positions are expected to start typically in Sep 2025; but earlier start dates (as early as March 2025) can also be considered. Screening of the applications will begin in late December 2024 and will continue until the positions are filled. *Expressions of interest can be submitted here:* https://forms.gle/mGWkr3Cm6KDzktPn8 The research activities of the gmunu group include gravitational-wave modeling and phenomenology, black-hole and neutron-star physics, tests of gravity and of the nature of compact objects, and strong-gravity searches for dark matter. Group members are also expected to get involved in other activities such as training of students, networking, workshop & meeting organization, etc. The gmunu group currently includes the PI, Prof. Paolo Pani, 6 postdocs and 5 PhD students. Successful candidates will directly collaborate also with Prof. Francesco Pannarale (GW modelling and data analysis), Prof. Alfredo Urbano (Beyond the standard model theory and phenomenology; cosmology and physics of the primordial universe), and their students. Project members are also expected to interact with the ET experimental and GW data-analysis group [https://web.infn.it/VirgoRoma/index.php/en/] and with the INFN Rome Theory group [https://theory.roma1.infn.it/ ] at Sapienza, and to actively take part of the activities of the ET Observational Science Board. The Department of Physics at Sapienza is a vibrant work environment which hosts renowned research groups in several areas of physics, including gravitational-wave science, cosmology, and high-energy physics. In 2024 it ranked 12th among all Physics Departments worldwide and first in Italy, according to the Shanghai Global Ranking. -- Paolo Pani Professor of Theoretical Physics Junior Fellow, Scuola Superiore di Studi Avanzati Sapienza Physics Department (Marconi Building), 3rd floor, room 334 Sapienza University of Rome Piazzale Aldo Moro 5 - 00185 Rome (Italy) +39 06 4991 4472 (int 24472) https://web.uniroma1.it/gmunu/

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