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Meeting minutes for 6 June 2019
by Witek, Helvi 06 Jun '19

06 Jun '19

Present: Bill, Christopher, Peter, Steve, Helvi * North American ET Meeting 17-19 June 2019 in Rochester, US - Please register - Website: https://ccrg.rit.edu/content/events/2019-06-17/north-american-einstein-tool… - Broadcast via bluejeans * European ET Meeting 2-6 September 2019 in London, UK - Please register (deadline 31 July 2019) - Website: https://sites.google.com/view/eetm2019/home * Change citation policy for Einstein Toolkit - cite code directly via a DOI reference instead of only quoting the paper by Loeffler et al 2011 - information on this topic, see e.g. D. Katz' talk about software citation and sustainability at Charm++ workshop at NCSA starting at page 19: http://charm.cs.uiuc.edu/charmWorkshop/slides/14-Katz-Sustainability.pdf. - in practise: likely update DOI after each release - maybe example for current release - *new policy activated from 12 July 2019 onwards if there are no objections* * Memory increase during regridding (ET Trac #2194) - again observed memory increase after regridding which can be a bottleneck for large-scale simulations - check parameter file and plot on trac; Roland checking latest report - ping Erik * Gallery examples will be updated - TOV: small version for online/jupyter tutorial needs to be uploaded - BBH: in progress - BNS: in progress * Self-force code by Peter Diener et al - possibly included in the next ET release - currently in different repositories;. possible restructuring to make inclusion more straight-forward; -- =========================================== Dr. Helvi Witek Royal Society University Research Fellow Theoretical Particle Physics and Cosmology Department of Physics King's College London ===========================================

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interpolation error
by 林家暉 30 May '19

30 May '19

Hello, I am using IllinoisGRMHD with the test with nsns_test.par in https://bitbucket.org/zach_etienne/wvuthorns_diagnostics/src/master/NSNS_pa… . The simulation runs well until t~5300 and an error occurs. The error message is like this: WARNING level 1 from host nid02210 process 0 while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET in thorn AEILocalInterp, file /global/u1/c/chlin/et/Cactus/arrangements/Numerical/AEILocalInterp/src/Lagrange-tensor-product/../template.c:1109: -> CCTK_InterpLocalUniform(): interpolation point is either outside the grid, or inside but too close to the grid boundary! (this may be caused by a global interpolation with driver::ghost_size too small) 0-origin interpolation point number pt=0 of N_interp_points=1 interpolation point (x,y,z)=(-157.725,-576.349,-99.2027) grid x_min(delta_x)x_max = -576(18)576 grid y_min(delta_y)y_max = -576(18)54 grid z_min(delta_z)z_max = -576(18)54 WARNING level 1 from host nid02210 process 0 while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET in thorn particle_tracerET, file /global/u1/c/chlin/et/Cactus/arrangements/WVUThorns_Diagnostics/particle_tracerET/src/Interpolate_velocities_at_particle_positions.C:131: -> interpolation screwed up WARNING level 1 from host nid02210 process 1 while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET in thorn particle_tracerET, file /global/u1/c/chlin/et/Cactus/arrangements/WVUThorns_Diagnostics/particle_tracerET/src/Interpolate_velocities_at_particle_positions.C:131: -> interpolation screwed up srun: error: nid02211: tasks 2-3: Exited with exit code 1 srun: Terminating job step 21753671.0 srun: error: nid02210: tasks 0-1: Exited with exit code 1 I think maybe t can be avoided by decreasing the timestep so that the tracer particle would not move too fast to make the interpolation screwed up but I am not sure. So what I want to ask is : 1. It this error can be avoided by decreasing the timestep ? 2. If so, how can I decrease the timestep in parameter file (or in other places)? Thank you. Best regards, Chia-Hui

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Installing the toolkit
by Κοτοπούλη ς Δημήτρης 30 May '19

30 May '19

Dear sir or madam, I am currently thinking of turning to Linux so that using the Einstein Toolkit becomes easier. Which Linux version should I prefer? Thanks for your time.

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meeting minutes for 2019-05-30
by Haas, Roland 30 May '19

30 May '19

Present: Bill, Helvi, Peter, Roland, Sam, Toni, Steve, Yosef, Zach proposed changes to Einstein Toolkit citing policy: * will decide on July 12th * currently the ET as a whole is cited via the original paper Loeffler et al., however the author list has become stale wrt to currently involved people * newer software toolkits have transitioned to cite the software rather than a paper. This makes it easier for new people to contribute since they know they will get credit, helping software sustainability and supporting careers in software * there were no objections to this idea from the call participants Peter's self-force code into the ET: * code is not quite ready to include yet * is currently working on documentation * is currently working on adding a Cactus like test infrastructure * would go towards making the ET a true multi-code project * could be important as well for future funding of the ET * important for LISA science LISA science goals: * needs some IMRI capable code * (almost) equal mass needs much higher accuracy since it needs to be removed as a background from data * currently the LISA internal discussion is dominated by one code (which is not the ET) gallery examples: * TOV has been updated to match the ET paper * working on having a downsized version of this for the tutorial: all in agreement, will proceed this way * BBH example is in progress ET meeting at RIT: * PLEASE register * schedule is being finalized due to last minute changes * will broadcast over bluejeans for remote participation Peter reported in a very recent paper on a bssn like formulation of bimetric gravity. He contacted the authors about their interest in using the ET, which they are and had already looked at the ET. 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 2019-05-23
by Haas, Roland 23 May '19

23 May '19

Present: Roland, Zach, Antoni, Chris, Sam, Steve, Yosef proposed updates to citation policy: * will send email with details to mailing list trac to bitbucket switch: * Steve removed all mention of trac from website * Steve set up redirects on former trac website to bitbucket tickets Jenkins server down: * had break in to server, which was then used for bitcoin mining * Ian is working on restoring from backups * Roland to get a bit more involved to be able to do basic maintenance New ET components * Fishbone-Moncrief disk should be almost ready for inclusion ** has analysis code written around that, that could be used for a full science simulation ** postprocessing is mix of thorns and python code, was used for Event-Horizon-Telescope code comparison project Using the ET a library * Zach has a proof of concept hook into the ET that lets one use the ET as a library and inject data into it eg for horizon finding * useful to reach out to other projects * repo is here: https://bitbucket.org/zach_etienne/et_minimal_2019_03 which overwrites some Cactus functions in the ETK_interface.c file. The remainder code is vanilla Cactus. LISA meeting: * Steve and Sam attended the LISA meeting * have needs for very high accuracy and accurate phase * so far Cactus does not seem to be on their map * Intermediate (q=100) mass ratio inspiral (IMRI) runs are the most interesting ones, but not really something the ET can easily do. Some results exists by the RIT group. * Zach is working with students to link some PN work (EOB mostly) with ET and numerical relativity, this can be used to study 4PN effects RIT meeting: * register soon to enable head count Wiki to bitbucket wiki: * Steve will provide XML dump * running is currently not so much the issue, but the current LDAP plugin is no longer maintained and forces us to run specific versions PreSync: * can run all tests with PreSync turned off * no other updates * Sam, Steve and Roland to come up with a plan, so that this can be reported on in the report to NSF * Sam will present on this in PEARC July 28th to August 1st ET working groups: * need to take stock of where they are * need to restart presentations and discussions 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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Bug in Piraha / trac.einsteintoolkit.org is down
by Erik Schnetter 21 May '19

21 May '19

I just found and corrected a problem in how Piraha handles the "min" and "max" functions in parameter files: (1) Piraha processes the first argument twice. (This isn't really a bug since min and max are idempotent.) (2) Piraha stops after processing the first element since a "return" statement is placed wrong. The diff below corrects both problems. -erik $ git diff diff --git a/src/piraha/Call.cc b/src/piraha/Call.cc index cf777d58..facd2565 100644 --- a/src/piraha/Call.cc +++ b/src/piraha/Call.cc @@ -405,7 +405,7 @@ smart_ptr<Value> meval(smart_ptr<Group> gr,ExpressionEvaluationData *eedata) { std::string par = get_parfile(); CCTK_Error(gr->line(),par.c_str(),current_thorn.c_str(),msg.str().c_str()); } - for (int i=1; i<=gr->groupCount(); i++) { + for (int i=2; i<=gr->groupCount(); i++) { smart_ptr<Value> val_next = meval(gr->group(i),eedata); // Make sure all arguments are either integer or real if (val_next->type != PIR_REAL && val_next->type != PIR_INT) { @@ -437,8 +437,8 @@ smart_ptr<Value> meval(smart_ptr<Group> gr,ExpressionEvaluationData *eedata) { std::string par = get_parfile(); CCTK_Error(gr->line(),par.c_str(),current_thorn.c_str(),"internal error"); } - return val; } + return val; } // From here on only functions that take exactly one argument: the majority. else if (gr->groupCount() != 2) { -- Erik Schnetter <schnetter(a)gmail.com> http://www.perimeterinstitute.ca/personal/eschnetter/

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Jenkins build and test system
by Ian Hinder 20 May '19

20 May '19

Hi, Unfortunately, I have reason to believe that the ET Jenkins build and test system has again been compromised by cryptocurrency mining malware, so it has been taken offline. We have backups from before the intrusion, but need to identify the security flaw which allowed this before restoring the last good backup, changing all security tokens, and bringing the system back online. -- Ian Hinder Research Software Engineer University of Manchester, UK

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meeting minutes for 2019-05-16
by Haas, Roland 16 May '19

16 May '19

Present: Bill, Roland, Yosef ET RIT tutorial: * Roland and Yosef to create tutorial on how to set up BBH and BNS simulations ** geared towards inexperienced users, so show which parts of the parfile to change and which ones to not touch ** show how to visualize results ** maybe show how to reduce eccentricity by using Harald Pfeiffer's original method "by eye" * second announcement has been sent * sign up for hotel soon as the block expires May 24th * please register soon to have accurate head count for room ET citation for each release * Roland explained rational behind proposed change * will have more formal discussion next week, will have announcement on mailing list of plans 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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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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North American Einstein Toolkit Workshop -- information and program
by Yosef Zlochower 14 May '19

14 May '19

We are pleased to announce the 2019 edition of the North American Einstein Toolkit workshop. The workshop to be held at the Rochester Institute of Technology will provide an opportunity for researchers and students to learn about the toolkit and discuss its future development. The Einstein Toolkit https://einsteintoolkit.org/ is a community-driven software platform of core computational tools to advance and support research in relativistic astrophysics and gravitational physics. The workshop will be held on June 17 through June 19. The full scientific program, list of speakers, and information about lodging, and registration can be found at https://ccrg.rit.edu/content/events/2019-06-17/north-american-einstein-tool…. Participants are asked to register for the workshop here https://securelb.imodules.com/s/1624/18/interior.aspx?sid=1624&gid=1&pgid=5…

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