Users April 2019

users@lists.einsteintoolkit.org

14 participants
15 discussions

Einstein Toolkit Meeting Reminder
by Steven R. Brandt 31 Oct '19

31 Oct '19

Hi Please consider joining the weekly Einstein Toolkit phone call at 9:30 am US central time on Mondays. 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 --Steve

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Agenda for Monday's Meeting
by Steven R. Brandt 30 Oct '19

30 Oct '19

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

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New Einstein Toolkit Release (Chien-Shiung Wu)
by Steven R. Brandt 30 Oct '19

30 Oct '19

=== Release Announcement === We are pleased to announce the sixteenth release (code name "Tesla") of the Einstein Toolkit, an open, community developed software infrastructure for relativistic astrophysics. The highlights of this release are Five new thorns have been added: * GiRaFFE * GiRaFFEfood * ShiftedKerrSchild * GiRaFFE_to_HydroBase * ID_converter_GiRaFFE In addition, bug fixes accumulated since the previous release in Feb 2018 have been included. The Einstein Toolkit is a collection of software components and tools for simulating and analyzing general relativistic astrophysical systems that builds on numerous software efforts in the numerical relativity community including CactusEinstein, the Carpet AMR infrastructure and the relativistic magneto-hydrodynamics code GRHydro. 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 toolkit includes modules to build complete codes for simulating black hole spacetimes as well as systems governed by relativistic magneto-hydrodynamics. The Einstein Toolkit uses a distributed software model and 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 provide quality control for modules for inclusion in the toolkit and help coordinate support. The Einstein Toolkit Maintainers currently involve postdocs and faculty from six different institutions, and host weekly meetings that are open for anyone to join in. 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. The Einstein Toolkit is primarily supported by NSF 1550551/1550461/1550436/1550514 (Einstein Toolkit Community Integration and Data Exploration). The Einstein Toolkit contains about 200 regression test cases. On a large portion of the tested machines, almost all of these tests pass, using both MPI and OpenMP parallelization. The changes between this and the previous release include: == Larger changes since last release == * Support has been added for GCC8. * Built-in OpenMPI tarball has been upgraded to 1.10.7 Note, we still recommend using the system MPI that is installed natively on your system. * And many bug fixes. Notably, a significant correctness problem for NewRad was addressed which caused many simulations with more than two ranks to fail https://trac.einsteintoolkit.org/ticket/2182 == New thorns or tools == * GiRaFFE (~1,600 lines of code): Solves the GRFFE equations in the formalism of Paschalidis and Shapiro [2] using the same reconstruction (PPM) and staggered vector potential methods as IllinoisGRMHD. * GiRaFFEfood (~1,300 lines of code): Code validation initial data and basic diagnostics. Contains Five 1D tests in flat spacetime (fast wave, Alfvén wave, degenerate Alfvén wave, "three-wave", FFE breakdown), One 3D test in flat spacetime (aligned rotator), and Three 3D tests in curved spacetimes ("Exact Wald" solution, "Magnetospheric Wald" solution, and split monopole). * ShiftedKerrSchild (~230 lines of code): Sets up all 3+1 quantities for a Kerr-Schild spacetime with an arbitrary radial shift, to mitigate effects of extreme spacetime curvature near r_{KS}=0. See Appendix of code release paper for full discussion. * GiRaFFE_to_HydroBase and ID_converter_GiRaFFE (~230 lines of code): Acts as a translation layer to convert 3-velocities in HydroBase's Valencia formalism to/from the 3-velocity found in the induction equation (vi = ui/u0; native to GiRaFFE). == Upcoming changes for the next releases == == New thorns planned for the next relases == * Seed_Magnetic_Fields-modified Extended Seed_Magnetic_Fields thorn for binary neutron stars. Supercedes Seed_Magnetic_Fields thorn. * Meudon_Bin_NS-modified Modifications to Meudon BNS initial data thorn to disable the overwriting of initial lapse/shift, which acts to significantly reduce coordinate eccentricity. Supercedes Meudon_Bin_NS thorn. * VolumeIntegrals_GRMHD Nice GRMHD volume integration thorn, currently depends on IllinoisGRMHD and Carpet. Performs volume integrals on arbitrary "Swiss-cheese"-like topologies, and even interoperates with Carpet to track NS centers of mass. * VolumeIntegrals_vacuum Nice GRMHD volume integration thorn, currently depends on ML_BSSN. There is a bit of code duplication and duplicated functionality between VI_GRMHD and VI_vacuum, to ensure that VI_vacuum can be used without enabling a GRMHD code. There is probably a better way of doing this, but I haven't had the time to think deeply about this. * particle_tracerET Solves the ODE \partial_t xi = vi for typically thousands of tracer particles, using an RK4 integration atop the current timestepping. E.g., one RK4 substep in the particle integration might occur every 16 RK4 substeps in the GRMHD evolution. These tracer particle positions are quite useful for visualizing magnetic field lines in a consistent way from frame-to-frame in a movie (recall that in the GRMHD approximation, the magnetic field lines stay attached the fluid elements they thread Flux Freezing?). Note that the velocity must be consistent with the velocity appearing in the GRMHD induction equation. This thorn reads in the HydroBase vel[] vector gridfunction, which assumes the Valencia formalism, and converts it into the induction equation velocity. * smallbPoynET Computes bi, b2, and three spatial components of Poynting flux. It also computes (-1-u0), which is useful for tracking unbound matter. * LeanBSSNMoL and NPScalars: LeanBSSNMoL evolves Einstein's Equations with the BSSN formulation. NPScalars computes the Newman-Penrose scalars. For the conformal factor it uses the "W" version, i.e. W=\gamma^{-1/6}, and it employs the usual "1+log" and "Gamma-driver" gauge conditions. Also available, in the "new_gauge" branch, is the shift condition of Figueras et al for their evolutions of higher dimensional BHs, see: https://arxiv.org/abs/1702.01755 https://arxiv.org/abs/1512.04532 * Proca arrangement: This repository (https://bitbucket.org/canuda/proca/src) provides the tools to evolve the Einstein-Proca system as first described in https://arxiv.org/abs/1505.00797 == How to upgrade from Tesla (ET_2018_02) == 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/) on the Einstein Toolkit website for download instructions. == Machine notes == Supported (tested) machines include: * Default Debian, Ubuntu, Fedora, CentOS, Mint, OpenSUSE and MacOS (Homebrew and MacPorts) installations * Bluewaters * Comet * Cori * Draco * Edison * Golub * Hydra * Marconi * Minerva * Queenbee 2 * Stampede 2 * SuperMIC * Wheeler * 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. * A new configuration for KNL nodes is being worked on, but not yet included in the release (but compilation works and tests mostly pass). All repositories participating in this release carry a branch ET_2018_02 marking this release. These release branches will be updated if severe errors are found. The "Chien-Shiung Wu" Release Team on behalf of the Einstein Toolkit Consortium (2018-09-17) * Steven R. Brandt * Samuel D. Cupp * Peter Diener * Roland Haas * Roberto De Pietri Sep, 2018

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coupling Llama to an evolution code
by Miguel Zilhão 16 May '19

16 May '19

hi all, i have a few evolution codes that i would like to make Llama-aware. one of them would be the LeanBSSNMoL thorn, that was included in the latest ET release. is there a canonical procedure to do this, or any documentation that i should follow? i understand that the main thing to change are the finite differencing operations... is there a standard way of performing this change? or anything else i should be aware of? thanks, Miguel

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SimFactory!
by Shankar, Ramraj 27 Apr '19

27 Apr '19

Hello, I would like to know the actual applications of SimFactory. I am not very sure of it range of applications. Is it possible to use for material flow simulation in factory like FlexSim, Simul8? Regards, S.Ramraj. ________________________________________ From: Haas, Roland [rhaas(a)illinois.edu] Sent: 26 April 2019 20:44 To: Shankar, Ramraj Subject: Re: [Users] SimFactory! Hello S.Ramraj, that is likely not possible out of the box. Simfactory itself is just a tool to orchestrate simulations using the Cactus computational framework. Cactus itself is a generic framework aiming to simplify solving hyperbolic partial differential equations using (mostly) finite difference methods. Its main (almost exclusive) client code is the Einstein Toolkit which provides codes and other utilities to simulate astrophysical events, for example colliding black holes, neutron stars, supernova, cosmology etc. There are some users of Cactus that have used it for other simulations eg. David Rideout for Causal Set Quantum Gravity (http://cactuscode.org/about/team/drideout) and there is a project to use it to simulate the shallow water equation for Hurrican flood predictions. I am not aware myself (though that does not mean it does not exist) of an actual discrete event simulation. I would suggest sending an email explaining about the system you would like to simulate to either users(a)einsteintoolkit.org or users(a)cactuscode.org to see if there is anyone who can provide insight. Yours, Roland > Hello Roland, > > Thanks a lot again! > I have signed up earlier today. > I would like to be sure that in simfactory, it is possible to perform discrete event simulation of material flow in factory . > > > > > Regards, > S.Ramraj. > -- 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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SimFactory!
by Shankar, Ramraj 26 Apr '19

26 Apr '19

Hello, I am interested in using simfactory. Thus, I tried to download einstein toolkit in my windows pc. But I am getting error. I have attached the screenshot of the error. Could pls help me with this. Regards, S.Ramraj.

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evolving a BH hole with Kerr-Schild ID in ET
by Haas, Roland 25 Apr '19

25 Apr '19

Hello all, I am wondering if it is possible to take initial data for a single (maybe spinning) black whole in Kerr-Schild coordinates as provided by Exact or EinsteinExact (metric, curvature, lapse, shift, time derivatives of lapse and shift) and chose parameters for the "usual" 1+log and Gamma driver gauge evolution conditions so that this data is a stationary solution of the evolution equations? 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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meeting minutes for 2019-04-25
by Haas, Roland 25 Apr '19

25 Apr '19

Present: Bill, Helvi, Roland, Sam, Steve, Yosef, Zach server issues: * VM crash, currently in process of recovering the image * concurrent higher priority issues prevent staff from looking into it right now * wiki software is again, may want to give conversion to markdown a try which is about as much work as updating the software to a new mediawiki software Gallery examples: * multipatch scalar wave: done, data has been updated * Poisson equation: finished running, will upload the data in the next few days * BBH: runs are still waiting in queue * TOV: using the old ET paper parfile (updated) produces different results from what is shown in the paper. See https://bitbucket.org/einsteintoolkit/tickets/issues/2175 Runs were run on Aug 19 2011 on TACC Lonestar by Frank. There will be no ET call next week Thursday May 2nd. 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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European Einstein Toolkit School and Workshop, September 2019, London
by Witek, Helvi 22 Apr '19

22 Apr '19

Dear all, the next European Einstein Toolkit Workshop and School will take place from 2 - 6 September 2019 at King’s College London, UK. The meeting will offer a school on the first two days introducing new users on how to install and run the Einstein Toolkit, and useful post-processing and visualizations tools. We furthermore provide a platform for ample discussion within the Einstein Toolkit community and with our friends in the broader numerical relativity community. In the second half of the week, the workshop will highlight exciting science cases and the latest developments in numerical relativity. The registration is now open on our website: https://sites.google.com/view/eetm2019/home The registration and abstract submission deadline is on 31 July 2019. There is no registration fee. Note, that we currently cannot offer any travel support. If you wish to give a talk, please submit a title+abstract together with your registration. Best wishes, Helvi Witek (On behalf of the organizing committee) Scientific Organizing Committee: Steve Brandt Bruno Giacomazzo Roland Haas Bhavesh Khamesra Helvi Witek Miguel Zilhao Local Organizing Committee: Josu Aurrekoetxea Matthew Elley Giuseppe Ficarra Eugene Lim Helvi Witek Dates: 2 - 6 September 2019 Location: King's College London, UK Registration and abstract submission deadline: 31 July 2019 Website: https://sites.google.com/view/eetm2019/home =========================================== Dr. Helvi Witek Royal Society University Research Fellow Theoretical Particle Physics and Cosmology Department of Physics King's College London ===========================================

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meeting minutes for 2019-04-11
by Haas, Roland 11 Apr '19

11 Apr '19

Present: Roland, Chris, Peter, Sam, Steve, Bill gallery examples * BBH, Poisson, TOV: no updates since Helvi could not make it * BNS: Peter will start looking once more ET meeting at KCL: * no update since Helvi could not make it * will put announcement on ET website once it is stable enough ET meeting at RIT: * no update since Yosef could not make it Tutorial server: * no major issues known at this point * Bill will try once more to run the tutorial * currently have to manually pull docker image once it needs updates since build takes to long to be done on-demand * suggest using a web-hook or cronjob (once a day) to pull the newest image * make sure that docker image stays useful for regular tutorials ** may want to add scipy to it Questions on mailing list: * Steve asked about Cartoon's SYNC behaviour 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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Users April 2019