Users October 2024

users@lists.einsteintoolkit.org

16 participants
25 discussions

hybrid star setup in the TOVSolver thorn
by CJ Osakwe 07 Nov '24

07 Nov '24

Hello, I am trying to set up a stable hybrid star (with a quark matter core and hadronic crust, each with their own equation of state) in the Einstein Toolkit. My initial approach was to adapt the TOVSolver thorn to achieve this, but the code is removing the density discontinuity at the hadronic-quark matter interface when it interpolates from 1D to 3D. As well the discontinuity doesn't seem to be reflected in the pressure anyway. I'm wondering if there is a thorn that is better suited for setting up a stable hybrid star? Cheers, CJ Osakwe PhD candidate, Department of Physics and Astronomy University of Calgary

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Unable to set Cactus to use all threads in hypter-threaded cores
by José Ferreira 01 Nov '24

01 Nov '24

Dear Toolkit Community, I’m struggling to make use of all of the available threads in the toolkit when running on a machine that has hypter-threading enabled. On my local machine, which does not have hypter-threading, if I invoke the toolkit’s binary using |OMP_NUM_THREADS=2 mpirun -np 4 -- exe/base -p par/parfile.par|, it outputs |INFO (Carpet): MPI is enabled INFO (Carpet): Carpet is running on 4 processes INFO (Carpet): This is process 0 INFO (Carpet): OpenMP is enabled INFO (Carpet): This process contains 2 threads, this is thread 0 INFO (Carpet): There are 8 threads in total INFO (Carpet): There are 2 threads per process | This creates 4 processes with 2 threads each and uses all 8 of the available threads in my CPU, as expected. I am now free to change the number of processes and threads as I see fit, in order to look for the configuration that minimizes the physical time per hour. However, most of my computations are performed in Marenostrum5, where each machine has 2 sockets, each with 56 physical cores with hyper-threading enabled, totaling to 112 physical cores or 224 threads per machine. For some reason, the toolkit does not use all of the available threads. To replicate the scenario above, I use the following Slurm submission script |#!/usr/bin/env bash #SBATCH -N 1 #SBATCH -n 4 #SBATCH -c 1 #SBATCH -t 30 export OMP_NUM_THREADS=2 srun --cpu-bind=none exe/base par/parfile.par | where I ask for a single machine, 4 tasks (to me, task = a process) per machine and 1 CPU per task, which due to hyper-threading should provide 2 threads per task. The output of the toolkit is |754 INFO (Carpet): MPI is enabled 755 INFO (Carpet): Carpet is running on 4 processes 756 INFO (Carpet): This is process 0 757 INFO (Carpet): OpenMP is enabled 758 INFO (Carpet): This process contains 1 threads, this is thread 0 759 INFO (Carpet): There are 4 threads in total 760 INFO (Carpet): There are 1 threads per process 761 INFO (Carpet): This process runs on host gs22r3b16, pid=1514092 762 INFO (Carpet): This process runs on 8 cores: 54-55, 97, 105, 166-167, 209,217 763 INFO (Carpet): Thread 0 runs on 8 cores: 54-55, 97, 105, 166-167, 209, 217 | From the output above you can see that I have been provided with 8 cores, even though I have requested 4 CPUs in total, which means thar the toolkit can see the available threads coming from hyper-threading. It also shows that it ignored my request for 2 threads per process, which I set via the environmental variable |OMP_NUM_THREADS|. If I force |CACTUS_NUM_THREADS=2|, it crashes with the error |INFO (Carpet): MPI is enabled INFO (Carpet): Carpet is running on 4 processes INFO (Carpet): This is process 0 INFO (Carpet): OpenMP is enabled INFO (Carpet): This process contains 1 threads, this is thread 0 WARNING level 0 from host gs06r3b13 process 1 in thorn Carpet, file /gpfs/home/uapt/uapt015213/projects/cactus/arrangements/Carpet/Carpet/src/SetupGH.cc:187: -> The environment variable CACTUS_NUM_THREADS is set to 2, but there are 1 threads on this process. This may indicate a severe problem with the OpenMP startup mechanism. | which leads me to believe that it is MPI that is refusing to initialize more threads, and not the toolkit itself. My questions are: 1. Is there a performance gain by making use of hyper-threading knowing that the toolkit is memory bound and the different threads share the same cache? 2. If yes, how can I adapt my submission scripts to tell Cactus to make use of hyper-threading? Thank you in advance, Best regards, José Ferreira

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einsteintoolkit
by Peter Wang 31 Oct '24

31 Oct '24

Dear Manager, (If you are not the person who in charge of this, please forward this to your CEO, because this is urgent.Thanks!) I'm Peter Wang(Mr.), Services & Operating Manager, working for a network service company based in Shanghai, China, mainly responsible for registering Chinese domain names. On October 28, 2024, we received an application from Shenjia Holdings Ltd requested “einsteintoolkit” as their internet keyword and China (CN) domain names( einsteintoolkit.cn/ einsteintoolkit.com.cn/ einsteintoolkit.net.cn/ einsteintoolkit.org.cn). After checking it, we find this name conflict with your company name or trademark. In order to deal with this matter better, we send email to you and confirm whether your company is affiliated with this company in China? Kind regards Peter ----------------------------- Mr.Peter Wang | Services & Operating Manager No. 98 Xinhua Middle Road, Zhangyan, Shanghai 201500,China T: 008 6-134-8 281-914 7 | Tel: 0086-21-619 1-869 6 | Fax: 008 6-21-61 91-869 7 ---------------------------------------------------------------------------------------------------------- Tip: Please Add mail sender account to your contacts to make sure our response does not end up in your spam folder.

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Meeting minutes for 2024-10-31
by Cupp, Samuel D. 31 Oct '24

31 Oct '24

Present: Sam, Roland, Peter, Zach, Bill, David, Leo, Maxwell, Cheng-Hsin, Steve # ET Release: * Tomorrow is the feature freeze for the release * Vote held to accept TOVola as part of ET; vote passed * Z4c is currently still not ready for inclusion, as there are no test cases. Reviewer Steve will try to look at it today or tomorrow to verify that there haven't been any silent updates addressing this. * Gallery example runners: ** BNS - Maxwell ** BBH - Peter ** TOV - David (also working to update gallery parfile) ** Scalar wave - Bill ** Poisson Equation - Lucas * Running tests on clusters: ** Most cluster runners are unchanged ** No one on the call can run on Frontera, SuperMUC # Tickets * 2761: include cmake as ExternalLibrary; very slow to build, so using builds on the cluster is preferable. Still, having the option is desirable AMRex has minimum cmake version, so it would be helpful if the thorn checked that the version meets this requirement * 2820: NewRadX BC discussion ongoing regarding requested changes * 2818: Tests still failing when compiling with gcc-14 * 2814: some progress made, but more elements of the 'tensortypealias' table need to be implemented; various implementation details were discussed on the call Next week: Chair - Steve Minute taker - Leo

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 30 Oct '24

30 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. ** DAYLIGHT SAVING TIME WARNING ** Please note that the US / EU has already / not yet transitioned to / from daylight saving time. The phone call will be at 15:00 Central EU time. https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call --The Maintainers

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 28 Oct '24

28 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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Error with the Cactus Tutorial
by A C 26 Oct '24

26 Oct '24

Hello, I am writing to seek your assistance regarding a sudden error I encountered while running a cell in the Cactus Tutorial. The following command was functioning correctly until recently: %%bash ./simfactory/bin/sim build -j2 --thornlist thornlists/einsteintoolkit.th The error is: collect2: fatal error: ld terminated with signal 9 [Killed] compilation terminated. make[1]: *** [/home/andre2mila/Cactus/lib/make/make.configuration:150: /home/andre2mila/Cactus/exe/cactus_sim] Error 1 make: *** [Makefile:265: sim] Error 2 If necessary, I would be open to having my tutorial reset. Thank you for your time and assistance, Andrea.

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Meeting minutes for 2024-10-24
by Lucas Timotheo Sanches 24 Oct '24

24 Oct '24

Attendees: Lucas T. S. (minutes), Peter Diener, Steven R. Brandt (chair), Bill Gabella, Johnny Tsao, Leo Rosa Werneck, Peter Diener, Zach Etienne. # ET Release timeline There's been activity in Tovola's review. David and Maxwell addressed Roland's previous comments on the thorn. He says he will push his changes and update the ticket soon. Bill Gabella asked if a release name had been decided. The attendees voted for "Annie Jump Cannon." Steve notes that Roland, as release manager, has the right to decline this choice later on. # Tickets 2820: Lucas has spoken with Cheng Hsin, the main author of the thorn. He has provided test cases for the patch and a review is underway. 2787: Steve and Roland will iterate that. Zach reports an update that was an "almost ticket". He removed an unnecessary Giraffe dependency on the shifted KS thorn.

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Einstein Toolkit Meeting Reminder
by rhaas＠illinois.edu 23 Oct '24

23 Oct '24

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Agenda for Thursday's Meeting
by rhaas＠illinois.edu 21 Oct '24

21 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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