Users May 2017

users@lists.einsteintoolkit.org

20 participants
33 discussions

Re: [Users] [ET Trac] [Einstein Toolkit] #1326: running loopcontrol on strange number of threads fails
by Erik Schnetter 11 Apr '19

11 Apr '19

Do you have a backtrace? -erik On Sunday, March 22, 2015, Einstein Toolkit < trac-noreply(a)einsteintoolkit.org> wrote: > #1326: running loopcontrol on strange number of threads fails > ------------------------------------+--------------------------------------- > Reporter: rhaas | Owner: > Type: defect | Status: new > Priority: minor | Milestone: > Component: EinsteinToolkit thorn | Version: > Resolution: | Keywords: LoopControl > ------------------------------------+--------------------------------------- > > Comment (by rhaas): > > This still happens even with current (Sun Mar 22 18:46:21 CET 2015) trunk, > though failure looks a bit different now: > {{{ > actus_sim: > /data/rhaas/postdoc/gr/ET_trunk/configs/sim/build/LoopControl/loopcontrol.cc:312: > T {anonymous}::divexact(T, T) [with T = int]: Assertion `i % j == 0' > failed > }}} > > -- > Ticket URL: <https://trac.einsteintoolkit.org/ticket/1326#comment:1> > Einstein Toolkit <http://einsteintoolkit.org> > The Einstein Toolkit > _______________________________________________ > Trac mailing list > Trac(a)einsteintoolkit.org > http://lists.einsteintoolkit.org/mailman/listinfo/trac > -- Erik Schnetter <schnetter(a)cct.lsu.edu> http://www.perimeterinstitute.ca/personal/eschnetter/

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North American Einstein Toolkit School and Workshop at NCSA
by Roland Haas 13 Jul '17

13 Jul '17

Hello all, the North American Einstein Toolkit School and Workshop will be hosted this year that NCSA, at the University of Illinois at Urbana-Champaign from July 31 to August 4 2017 (http://www.ncsa.illinois.edu/Conferences/ETK17/). The Einstein Toolkit is a publicly available framework used by several numerical relativity groups in the world, with applications ranging from high-energy astrophysics to cosmology. This meeting is open to anyone interested in numerical relativity and computational astrophysics and cosmology and in particular to Einstein toolkit users. There will be a 3 day school from July 31 to August 2, 2017 that will introduce students and postdocs to the Einstein Toolkit and numerical methods related to it. After that, on August 3 to August 4, 2017, the Einstein Toolkit workshop will cover the most recent developments of the toolkit, offer the possibility for collaboration and discussions about future plans. Individual registrations for each of the school and workshop are now open on http://www.ncsa.illinois.edu/Conferences/ETK17. There, you will also find information on available hotels, hotel sharing and a tentative program. Information on financial support is available on the registration page. The initial deadline for applying for support is June 1, 2017. Separate registration is required for each of the school and the workshop. When registering for the school you have the option of listing topics of interest for the school and your level of expertise. For the workshop you can suggest discussion topics as well as register a title and abstract for a 5 minute presentation you would like to give. The Einstein Toolkit community in Europe will host a two day meeting in Palma de Mallorca, Spain October 11-13. For further information please do not hesitate to contact the organizers at etk2017(a)ncsa.illinois.edu. Yours, Roland Haas, for the organizers

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GW150914 example, noisy Psi4 waveforms
by Christian D. Ott 18 Jun '17

18 Jun '17

Hi All, I have been experimenting with the GW150914 par file (Thanks for putting it together!), which uses Llama multipatch (MP) with McLachlan (ML) and, of course, Carpet AMR in the interior Cartesian patch, tracking the punctures. I'm noticing three things when looking at Psi4 l2,m2 waveforms (and this is largely independent of extraction radius): (1) The waveforms have high-frequency wiggles that similar pure-AMR simulations do not show. I don't have a pure AMR simulation for GW150914, but am comparing with an 8-orbit, equal mass, non-spinnning case. I can run GW150914 with pure AMR if need be. (2) The high-frequency wiggles get *worse* if I decrease the finite differencing order from 8th to 4th order. (3) This appears to be a wave amplitude-dependent 'feature', since the wiggles are much less pronounced once the waves reach higher amplitudes. I'm attaching two gnuplot screenshots: fig1.png shows the first ~800 M of Psi4 l2,m2 real at r=136 M with the stock par file and with a modified par file for 4th order. fig2.png is a zoom-in. I'm also attaching the par file that I'm using for the 4th-order run. Now my questions: Does anybody have an idea where the high-f noise is coming from and why it's getting worth for lower FD order? Any suggestions on how to mitigate it? Thanks! - Christian

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DataVault — Einstein Toolkit Data Repository Pre-design Survey
by Qian Zhang 01 Jun '17

01 Jun '17

Dear Einstein Toolkit (ET) users, As part of an NSF software award, we are planning to build an open, community data repository for the Einstein Toolkit (ET). A core driver for this repository is to facilitate data retention and sharing. Datasets produced by the Einstein Toolkit will be archived in an open repository where they can be connected to publications via a DOI, and searched for via metadata. We would welcome hearing your thoughts on how to share and sustain the datasets produced by the ET. You are invited to participate in this research project because you are the user of the Einstein Toolkit and associated data. Your participation in this research study is *voluntary*. You may choose not to participate. If you decide to participate in this research survey <https://docs.google.com/forms/d/e/1FAIpQLSdLrcXVJXKZBv3PAIaXtgj6YMylPVxwx-c…> (and a follow-up survey), you may withdraw at any time. If you decide not to participate in this study or if you withdraw from participating at any time, you will not be penalized. The procedure involves filling an online survey that will take approximately 20 minutes. Your responses will be *confidential* and we do not collect identifying information such as your name, email address or IP address. The survey (and a follow-up survey) questions will be about how you managed your simulation data regularly and related experience with using other data repositories. We will do our best to keep your information confidential. All data is stored in an electronic format. To help protect your confidentiality, the surveys will not contain information that will personally identify you. The results of this study will be used for scholarly purposes only and may be shared with related project personnels. If you have any questions about the research study, please contact Gabrielle Allen (gdallen(a)illinois.edu), Roland Hass (rhaas(a)illinois.edu) or Qian Zhang (zqian1(a)illinois.edu). This research has been reviewed according to University of Illinois at Urbana-Champaign IRB procedures for research involving human subjects. If you have any questions about your rights as a participant in this study or any concerns or complaints, please contact the University of Illinois Office for the Protection of Research Subjects at 217-333-2670 <(217)%20333-2670> or via email at irb(a)illinois.edu. The *link* to the survey is *here* <https://docs.google.com/forms/d/e/1FAIpQLSdLrcXVJXKZBv3PAIaXtgj6YMylPVxwx-c…> (the same link as above). Please complete the survey by the end of *next Sunday, June 4*. Thank you very much!

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Fwd: 2 PhD + 1 postdoc position in Warsaw
by Eloisa Bentivegna 31 May '17

31 May '17

Dear all, a collaborator of mine is looking to fill three positions (two PhD and one postdoc) with people with a NR background, and possibly experience with the ET. Details below. For further information, please enquire directly with him. Best, Eloisa > -------- Forwarded Message -------- > Subject: 2 PhD + 1 postdoc position in Warsaw > Date: Tue, 30 May 2017 13:43:00 +0200 > From: Mikołaj Korzyński <korzynski(a)cft.edu.pl> > > Hi, > > Sorry for spamming, if you happen to know suitable candidates, please > let them know about my job offer. > > I am offering two 4-year PhD positions at Center for Theoretical > Physics, Polish Academy of Science, Warsaw, financed from the project > „Local relativistic perturbation theory in hydrodynamics and > cosmology”. The principal investigator is Mikołaj Korzyński. The PhD > students will be enlisted as a participants of the PhD Program of the > Institute of Physics PAS, following their individual programs. The > subject of the PhD will be related to the topic of the project. The > students will receive a stipend of 3000 PLN/month. > > The deadline for applications is June 30th, 2017. For more > information please contact Mikołaj Korzyński (korzynski(a)cft.edu.pl) > or see the group homepage http://relativitycft.wordpress.com/ > > I am also offering a post-doc position for a numerical relativist for > the same project, 1 year extendible to 4 years. The deadline is Aug > 1st. See also the group homepage http://relativitycft.wordpress.com/ > for details. > > Best regards, -- Mikołaj Korzyński Center for Theoretical Physics, > Polish Academy of Sciences Al. Lotników 32/46, 02-668 Warszawa, > Poland

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Postdoctoral positions at the Rochester Institute of Technology
by Carlos Lousto 30 May '17

30 May '17

Postdoctoral positions at the Rochester Institute of Technology The Center for Computational Relativity and Gravitation (CCRG) at the Rochester Institute of Technology (RIT) anticipates filling several postdoctoral positions in the coming year. We are looking for postdoctoral candidates in the areas of modeling of gravitational waves sources and their electromagnetic counterparts with numerical relativity, and gravitational wave data analysis for LIGO and its astrophysical interpretation. In the area of gravitational-wave astronomy, we are particularly interested in candidates who are interested in the data analysis challenges involved in the detection of astrophysical gravitational wave sources; in the parameter estimation of binary compact objects, particularly binary black holes; in tests of general relativity enabled by gravitational wave measurements; and in the opportunities afforded by multimessenger astrophysics. In the area of computational astrophysics and astrophysical numerical relativity we are particularly interested in candidates who are interested in relativistic magneto-hydrodynamics (GRMHD) simulations of accretion disks around supermassive black hole mergers, and jet dynamics. This work will have direct impact on electromagnetic observations of active galactic nuclei, and is part of an ongoing long-term collaborative research effort with Julian Krolik at Johns Hopkins University, Scott Noble at the University of Tulsa, as well as other collaborators. In the area of numerical relativity we are interested in a candidate capable of working on the initial data and evolution of binary black holes and neutron stars in the framework of the Einstein- toolkit (ETK) and LazEv codes. We seek to develop and optimize current RIT's group codes as well as semianalytic efforts to model hybrid waveforms and final remnant formulae for LIGO. The ongoing effort includes several faculty, postdocs, and graduate students, as well as external collaborator Nakano at Kyoto University, and others. The successful postdoctoral candidates will have the opportunity to collaborate on a broad range of research topics in gravitational physics. Our group is involved in several large collaborations, including the LIGO Scientific Collaboration (LSC), The Einstein Toolkit Consortium (http://einsteintoolkit.org), and a Petascale computing project with NCSA. There are many senior researchers working in a broad range of areas of gravitational physics and astrophysics at the CCRG. This includes Manuela Campanelli (Director), Sukanya Chakrabarti, Joshua Faber, Carlos Lousto, Richard O'Shaughnessy, Jason Nordhaus, Yosef Zlochower, John Whelan, and Hans-Peter Bischof (a visualization expert), several postdoctoral fellows and Ph.D. students (see http://ccrg.rit.edu/people for an overview on who is or has been at CCRG). The group also collaborates with many faculty, postdocs and graduate students in the larger astrophysics group (http://www.rit.edu/cos/astrophysics/), the school of Mathematical Sciences (http://www.rit.edu/cos/sms/) and the School of Physics and Astronomy (http://www.rit.edu/cos/physics/). The positions are for two or three years and renewable depending on satisfactory performance and the availability of funds. CCRG researchers have access to several computing cluster facilities at national computing centers such as XSEDE and BlueWaters as well as a dedicated 1600-core cluster hosted at the Center. More information about the CCRG is available at http://ccrg.rit.edu/ And about Rochester at http://en.wikipedia.org/wiki/Rochester,_New_York Applications should consist of a cover letter, a brief statement of research interests, a curriculum vitae including publication list, and at least three letters of recommendation. All materials should be sent electronically as soon as possible to: ccrg-postdoc[AT]ccrgweb.rit.edu For an overview of all job openings at CCRG please go to: http://ccrg.rit.edu/spotlight/jobs. Enquiries can be addressed to the center's Director: Manuela Campanelli, manuela[AT]astro[dot]rit[dot]edu Center for Computational Relativity and Gravitation, School of Mathematical Sciences, and School of Physics and Astronomy, Rochester Institute of Technology (RIT) 85 Lomb Memorial Drive Rochester, New York 14623 USA Review of completed applications will begin as soon as available and will continue until a suitable candidate is found. Starting date can be as early as September, 2017. RIT is committed to equal employment opportunity and affirmative action.

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meeting minutes for 2017-05-29
by Roland Haas 29 May '17

29 May '17

Present: Christian, Steve, Frank, Roland, Eliu, Gela, Roberto, Erik, Upcoming release: * no progress on test suites * leftover tickets * aim for end of June KNL status: * most KNL machines (Cori, Marconi) can be used, if slowly so * stampede is the only machine that cannot be used * single nodes can be used on stampede but MPI currently still fails * will put in language stating that stampede is causing trouble and that speed is sub-optimal * will focus on KNL performance during ET workshop and possible followup workshops Noise in waveforms from McLachlan: * is not determined by size of Cartesian domain * substantial increase in resolution in the attachment region to multipatch helps * finest resolution is mostly unchanged * no change due to dissipation settings * right now 4th order (since coulpled to hydro) will do 8th order and report to mailing list with results Focus item for workshop: * porting to KNL (McLachlan, GRHydro) * KNL benchmark analysis 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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Einstein Toolkit Meeting Reminder
by Frank Loeffler 29 May '17

29 May '17

Hi Please consider joining the weekly Einstein Toolkit phone call at 9:30 am US central time on Mondays. Tomorrow, we will use a hangout again, with the URL being posted, as usual on this list, about 15 minutes before the meeting, and they will be also posted on https://docs.einsteintoolkit.org/et-docs/Main_Page After the call, anyone who is interested is again invited to test mumble (we had too few participants last week). So far, the verdict seems to be that the technology seems to be sound, but some of the clients are not as plug&play as a google hangout is. On the other hand, once the necessary setup is done (mostly having to do with when to mute/unmute your mic), things seem to work quite fine. This also seems to be similar whatever service you use (not just mumble). So, whatever it will be in the end, we will need a short how-to join (web page) before we make it default for the calls. Frank Löffler

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QB not run Cactus
by Dr. David Rosenberg 28 May '17

28 May '17

I have been unable to run Cactus on QueenBee. I am including the files that are produced:OptionList, Tau_Makefile, defs.local.ini and the output on units 1> and 2>. Would appreciate any help to get it running on QueenBee (drosnbrg(a)qb.loni.org) David Rosenberg

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Graphical display of timer data
by Steven R. Brandt 23 May '17

23 May '17

Is there a way to graphically display cactus timer data? We're thinking about having an REU student develop such a tool if it doesn't exist. Thanks. --Steve

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