Users July 2023

users@lists.einsteintoolkit.org

15 participants
28 discussions

Fwd: PhD position in gravitational-wave astrophysics at Utrecht University, The Netherlands
by Bruno Giacomazzo 21 Jul '23

21 Jul '23

FYI The deadline is 14 September. Please note that: - knowledge of use of large computing clusters and a solid background in (astro)physics and/or artificial intelligence is highly desirable; - strong preference will be given to candidates with existing knowledge of Python, as well as knowledge of parallel programming in Python. ---------- Forwarded message --------- Da: Samajdar, A. (Anuradha) <a.samajdar(a)uu.nl> Date: ven 21 lug 2023 alle ore 16:23 Subject: PhD position in gravitational-wave astrophysics at Utrecht University, The Netherlands Dear all, Please see an advertisement for a PhD position in gravitational-wave astrophysics at Utrecht University in the Netherlands below. It would be great if you could bring this to the attention of potential candidates. Regards, Anuradha ------------------------------------------------------------------ The Institute for Gravitational and Subatomic Physics (GRASP) at Utrecht University is looking for a highly motivated PhD candidate in gravitational-wave astrophysics. As the successful candidate, you will work with real and simulated gravitational wave data from existing detectors as well as envisaged next-generation observatories such as Einstein Telescope, use statistical tools such as Bayesian analysis to assess what the challenges will be, and develop novel methodology to analyse the data accurately. With the developed methods, you will likely be placing much more stringent bounds on fundamental constraints from third-generation detectors. You will join the international Einstein Telescope Collaboration as well as the LIGO-Virgo-KAGRA Collaboration, and are expected to participate in analysing data as part of the latter. You will work in the group of Dr Anuradha Samajdar, and you will be an active member of the broader Dutch consortium in gravitational waves. Other staff members working on gravitational waves within GRASP and the Department of Physics are Professor Chris Van Den Broeck and Dr Tanja Hinderer. More information as well as an application portal can be found in this link: https://www.uu.nl/en/organisation/working-at-utrecht-university/jobs/phd-po… ======================================================= Dr. Anuradha Samajdar Assistant professor Institute for Gravitational and Subatomic Physics (GRASP) Department of Physics, Utrecht University Princetonplein 1, 3584 CC Utrecht Email: a.samajdar(a)uu.nl

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ET_2023_11 Release: call for proposed inclusions
by Cupp, Samuel D. 18 Jul '23

18 Jul '23

Hello all, I am Samuel Cupp, and I am the release manager for the ET_2023_11 release. For anyone planning to propose new thorns or updates to current thorns, please email me with the name of the thorn(s) and a short description of the new feature(s). We will be deciding the list of inclusions for this release on the August 8th ET telecon. The current list of proposed thorns and updates is on the meeting agenda, which is located on the wiki<https://docs.einsteintoolkit.org/et-docs/Meeting_agenda>. Samuel Cupp Postdoctoral Researcher Department of Physics University of Idaho

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[IllinoisGRMHD] Issues at installation
by Valentín Nicolás Pena Donaire 13 Jul '23

13 Jul '23

Dear all, I hope this email finds you well. I'm writing to you as per indication in Step 7 at https://illinoisgrmhd.net/getstarted.html. I'm currently working in IMBH hierarchical mergers in AGN discs, and I think it'd be good for my project to use the code IllinoisGRMHD, as it considers 3D effects in the GRMHD phenomena around BHs. However, I've found a couple persisting issues at installation. I'm running on a Windows 11 Pro WSL x Ubuntu 22.04.2 LTS "Jammy Jellyfish". At Step 0, I have made sure to install a fully functional version of the Einstein Toolkit. 1. As per indicated in Step 4, I went to the file ubuntu-Intel.cfg (attached), as referred by my version of make_config-runmefirst. I was able to apt-get install all the packages referred in the preamble of ubuntu-Intel.cfg, except for libmpich2-dev, so I installed the closest packages available to apt-get: libmpich-dev and libmpich12. 2. At Step 4, when I try to ./make_config-runmefirst, I get the following error message: checking whether the C compiler (icc .-xhost -openmp -0fast -align -std=gnu99 -rdynamic) works... no configure: error: installation or configuration problem: C compiler cannot create executables (see configs/<configname>/config-data/config.log for details). Error creating configuration etilgrmhd make: *** [Makefile:762: etilgrmhd-config] Error 2 I am attaching config.log as config.log for reference as well, as config-1.log. If I change CC = icc in ubuntu-Intel.cfg to CC = gcc (which afaik my machine has installed), I get the same error message, but with a different config.log (attached as config-2.log), telling me about an unrecognised -align option. If I remove the -align flag from CFLAGS in ubuntu-Intel.cfg, I get the same error message with another config.log (attached as config-3.log), telling me about a host language not being recognised. And, lastly, if I change the -xhost flag in CFLAGS to -xc or -xc99, the same thing happens. The config.log file of this last option is attached as config-4.log. At this point I don't know what else to try to get a running version of IllinoisGRMHD. To be honest, I don't really know much about bash yet, so I was hoping you could provide some support about my installation issues. I will be happy to answer any questions necessary. Sincerely, Valentín Peña-Donaire MSc Student Institute of Astrophysics, School of Physics The Pontifical Catholic University of Chile.

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meeting minutes for 2023-07-13
by Roland Haas 13 Jul '23

13 Jul '23

Present: Roland, Steve, Yosef, Leo, Sam, Zach thorns proposed for inclusion ============================= * no updates Subcyling in CarpetX ==================== * Yosef and Allen find very slow speeds for BBH simulations * Alexandru Dima and Helvi are finding that comparing Lean_public and Lean_public in CarpetX that subcycling is responsible for the majority of slowdown (factor of 6 or so) * Roland suggests to use that as Subscribe to NR community call ============================== * no objections Users mailing list moderation ============================= * currently Peter is the only person moderating users(a)einsteintoolkit.org * also handles subscription requests * Yosef suggested adding more persons as moderators and add it to the ET call agenda * had some discussion on how to try and improve this process Unanswered emails ================= * https://lists.einsteintoolkit.org/pipermail/users/2023-July/008978.html Roland will respond Tickets ======= * https://bitbucket.org/einsteintoolkit/tickets/issues/2669/math-is-not-rende… Zach suggests to also provide PDF as fallback on the website * https://bitbucket.org/einsteintoolkit/tickets/issues/2647/incorrect-weno-co… Roland to check what existing reconstruction methods in GRhydro are actually doing (interpol or reconstruct) * https://bitbucket.org/einsteintoolkit/tickets/issues/2739/change-admmacros-… needs review, code from 2022 and review request from April 2023 * https://bitbucket.org/einsteintoolkit/tickets/issues/2526/mclachlan-has-inc… needs some internal Kranc knowledge, volunteer needed * https://bitbucket.org/einsteintoolkit/tickets/issues/2653/carpet-presync-tr… had some discussion on where checks for "already valid" happen in Carpet & Presync. Sam did observe that the changes proposed sped things up. Should be re-investigated to see if this still applies. * https://bitbucket.org/einsteintoolkit/tickets/issues/2637/update-cactus-cop… needs review, mostly finishes up a prior change to README files * https://bitbucket.org/einsteintoolkit/tickets/issues/963/improve-mclachlan-… discussion is going on between Peter and Zach where Zach proposes a better and more effective solution to the issue. Hope to revisit this after summer. Chair 2 weeks from now: Steve Minute take 2 weeks from now: Yosef Yours, Roland -- 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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How to choose the correct parameters “ppn, max-num-threads, num-threads, nodes, --cores, --num-threads and –procs" on my computer?
by mg21260017 13 Jul '23

13 Jul '23

Hello everyone! I’m new to the ET. I have the ET installed on my desktop. It has one Intel(R) Core(TM) i5-10500 CPU with 6 physical cores and two threads per single physical core (but according to the Ubuntu’s conventions, the computer has 12 processors in total, as shown in the attachment of this email) and it also has Ubuntu 20.4. So I wonder whether you could please tell me how to set the correct parallel parameters for ET simulations, such as the options of the submit command ./simfactory/bin/sim (--cores, --num-threads and –procs) and the initial values of the file <username>.ini (pn, max-num-threads, num-threads, nodes).         Up till now, I have tried many possible combinations without success. It usually returns messages like “Warning: Too many threads per process specified: specified num-threads=16 (ppn-used is 1)”, “Warning: Number of used cores per node, number of SMT threads, and number of threads per process are inconsistent: ppn-used=1, num-smt=1, num-threads=16_threads (ppn-used*num-smt must be an integer multiple of num-threads)” and “Warning: Total number of threads and number of threads per process are inconsistent: procs=1, num-threads=16 (procs*num-smt must be an integer multiple of num-threads)” and doesn't start running.       I know parallelization plays a very important role in massive numerical computations like the ET. However, I’m very confused by many of the concepts it uses. I don’t find a documentation for these parameters after browsing websites (like https://bitbucket.org/simfactory/simfactory2/src/master/doc/userguide/, https://simfactory.org/info/documentation/, http://einsteintoolkit.org/usersguide/UsersGuide.html or even in the source code in the directory “./simfactory/lib/”).  There are merely some hints in the jupyter tutorial “CactusTutorial.ipynb”. Kuarks

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 12 Jul '23

12 Jul '23

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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Re: [Users] Issue regarding tutorials of Einsteins toolkit using Jupyter notebook
by Steven R. Brandt 11 Jul '23

11 Jul '23

Might I suggest you register for the online workshop coming up? https://compact-binaries.org/content/events/2023-07-17/north-american-einst… --Steve On 7/11/2023 1:10 PM, Thejas A Nair wrote: > Dear Steven, > Thank you for the help, could you please help me with one more thing. > Since it's my first time in the toolkit, I am facing a lot of > conceptual issues. Could you please provide the physical problems > associated with the example code given in the notebook? it will > greatly enhance my Masters project. > > Warm regards > > > > On Mon, 10 Jul 2023 at 21:52, Steven R. Brandt <sbrandt(a)cct.lsu.edu> > wrote: > > Please see the tutorials section on the documentation page: > https://einsteintoolkit.org/documentation.html > > --Steve > > On 7/10/2023 2:21 PM, Thejas A Nair wrote: > > Dear Sir/Madam > > I am Thejas, final year Masters student at Central University of > > Kerala(India), my Masters project is on Gravitational waves. As > a part > > of it I have to work with Einstein's toolkit, I am facing some > issues > > regarding its installation, and I am a fresher in this field, > the main > > issue I am facing is not being able to run the code. I have > installed > > cactus(ubuntu 22.04), but was not able to find any useful tutorials > > regarding installation and execution of the command. Could you > please > > provide me details so that i can continue my work at an earliest, i > > greatly appreciate your consideration. > > > > Warm Regards > > > > > > > > _______________________________________________ > > Users mailing list > > Users(a)einsteintoolkit.org > > http://lists.einsteintoolkit.org/mailman/listinfo/users >

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Re: [Users] Only getting partial Waveform while running that parameter file in the gallery example for BBH GW150914
by Roland Haas 11 Jul '23

11 Jul '23

Hello Vinod, Yes, you will need to run the simulation until at least time=1400 to see the merger that happened at time=900 at a detector located at r=500. The expected_merger variable is, as far as I recall, only used to "size" the domain so the exact value is not extremely critical but should be about (and ideally not much smaller) than the actual merger time (eg based on a post-Newtonian prediction). If possible, please keep users(a)einsteintoolkit.org in the addressee list so that ohters can find this resolution as well. Yours, Roland On Mon, 10 Jul 2023 14:59:20 +0530 Vinod Pisharody <vinod.pisharody22(a)gmail.com> wrote: > Hello Roland , > Thank you for the response. I have only 1 output-0000 directory . > However looking at your first response I wanted to clarify . > In the .rpar file the "expected_merger " variable seems to take a > value of 1000 .However in my .out file the merger seems to happen > around 908 .Is this a discrepancy ?Also if I am understanding your > answer correctly then even after the merger happpens at say time=900 > ,I need to let the simulation run till time=1400 for the wave to > reach the detector at r =500 ? I am attaching the last few lines of > my .out file which shows the merger happpening around 908 > Thanks and regards, > Vinod > > On Fri, 7 Jul 2023 at 21:03, Roland Haas <rhaas(a)illinois.edu> wrote: > > > Hello Vinod, > > > > Sorry for the long delay. > > > > > I have been trying to run the simulation of GW150914 given in > > > gallery > > .The > > > simulation ran succesfully .However I am only getting a partial > > > waveform .The merger and the ringdown phase is not being captured > > > .I am attaching both the waveform and a gnuplot showing the > > > completing of merger . There > > is > > > also another doubt I have .In the gallery while creating the job > > > for this simulation there is a command called --define N which > > > is set to 28 > > .Could > > > someone tell me whats the purpose of that and help me understand > > > whats going wrong ? > > > > I cannot tell for sure since I do not know how long you ran the > > simulation. My first guess would be that the waveform has not yet > > had time to travel to the location of the detector at r=500. Since > > the source is the black holes at about r=0 it will take the wave > > about 500 time units to travel the distance of 500 space units > > (speed of light is c=1 in the simulation). > > > > A second issue to consider is that if you have multiple output-NNNN > > directories then you have to first concatenate the output data file > > to have access to all data. Specialized analysis tools like kuibit, > > SimulationTools and PostCactus (see > > https://urldefense.com/v3/__https://docs.einsteintoolkit.org/et-docs/Analys… > > ) will usually do this automatically but if you use your own Python > > or gnuplot code then you will have to do so yourself. > > > > Yours, > > Roland > > > > -- > > My email is as private as my paper mail. I therefore support > > encrypting and signing email messages. Get my PGP key from > > https://urldefense.com/v3/__http://pgp.mit.edu__;!!DZ3fjg!637T4cXsHrwZerkMg… > > .

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 10 Jul '23

10 Jul '23

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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Issue regarding tutorials of Einsteins toolkit using Jupyter notebook
by Thejas A Nair 10 Jul '23

10 Jul '23

Dear Sir/Madam I am Thejas, final year Masters student at Central University of Kerala(India), my Masters project is on Gravitational waves. As a part of it I have to work with Einstein's toolkit, I am facing some issues regarding its installation, and I am a fresher in this field, the main issue I am facing is not being able to run the code. I have installed cactus(ubuntu 22.04), but was not able to find any useful tutorials regarding installation and execution of the command. Could you please provide me details so that i can continue my work at an earliest, i greatly appreciate your consideration. Warm Regards

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