Users June 2018

users@lists.einsteintoolkit.org

19 participants
28 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

8 94

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

3 46

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/

3 2

compiling ET on OpenHPC 1.3.5 and a question
by Hamilton, Maria 29 Jun '18

29 Jun '18

Hello, Einstein Toolkit coiled smoothly on OpenHPC 1.3.5 with simfactory/mdb/optionlists/centos.cfg, by changing MPI_DIR, commenting out the HDF5-DIR and adding HWLOC_DIR. I do need help in setting up a run that would extract gravitational radiation for a boosted blackhole. Is there an exact solution for a boosted BH available? If not, no problem. Just a regular Schwarzschild BH will do for now. I'm interested in looking at what thorns are available in ET to constraining the initial data, and how do I switch between them? I'm sure this was done before, and I would really appreciate some pointers on how to start the simulation. Thank you, Maria _______________________ Dr. Maria C. Babiuc Hamilton Department of Physics Marshall University S257 Science Building Huntington, WV, 25755 Phone: (304)696-2754

2 2

cctk_ScheduleFunctions.h assuming "int" for a "void" scheduled routine?
by Bernard Kelly 27 Jun '18

27 Jun '18

Hi. I recently took a simple thorn --- one routine scheduled at POSTEVOL --- and enlarged it so that now there's a second routine scheduled at STARTUP. Both routines are written in C, taking in CCTK_ARGUMENTS, and returning void. The new routine is called Interpolate_setup.c During compilation, I get the following warning: ------------------------------ /nobackupp2/bjkelly1/codes/Cactus/configs/sim/build/interp_metric_sph_grid/Interpolate_setup.c(47): warning #147: declaration is incompatible with "int sph_grid_metric_initialize(void)" (declared at line 7 of "/nobackupp2/bjkelly1/codes/Cactus/configs/sim/bindings/include/interp_metric_sph_grid/cctk_ScheduleFunctions.h") void sph_grid_metric_initialize(CCTK_ARGUMENTS){ ^ ------------------------------ Can anyone tell me why the build process is assuming that the new routine is taking a void input and returning int? I can edit the thorn's auto-generated "cctk_ScheduleFunctions.h" by hand to correct this behavior, but it seems like it shouldn't be necessary. Bernard

3 3

GCC 8 -- may need to update Cactus configure script
by Erik Schnetter 26 Jun '18

26 Jun '18

GCC 8 was just released. The release notes contain this in their fine print: "Character variables longer than HUGE(0) elements are now possible on 64-bit targets. Note that this changes the procedure call ABI for all procedures with character arguments on 64-bit targets, as the type of the hidden character length argument has changed. The hidden character length argument is now of type INTEGER(C_SIZE_T)." In other words, strings can now be longer than 2e9 characters. This is a good change. To make this possible, the length of strings is now passed as ptrdiff_t instead of as int, and consequently, the C/Fortran interoperability mechanism in Cactus may need to be updated. Without this, there might be a segfault e.g. when calling CCTK_INFO from Fortran. (It might also be that things just work most of the time, although this would be an unreliable coincidence.) The respective include file that will need to be modified is "cctk_FortranString.h" in the flesh. -erik -- Erik Schnetter <schnetter(a)gmail.com> http://www.perimeterinstitute.ca/personal/eschnetter/

2 5

Postdoctoral Fellowships in Multi-messenger Astrophysics at the Rochester Institute of Technology
by Carlos Lousto 26 Jun '18

26 Jun '18

Postdoctoral Fellowships in Multi-messenger Astrophysics at the Rochester Institute of Technology, New York The recent observations of a binary neutron star merger using both gravitational wave interferometers as well as electromagnetic telescopes across the full spectrum have initiated the age of multi-messenger astronomy and astrophysics. As part of several NASA and NSF collaborative projects, the RIT's Center for Computational Relativity and Gravitation (CCRG) is currently seeking to fill one or two postdoctoral research positions with highly qualified individuals interested pursuing research in the fields of numerical relativity, theoretical and computational astrophysics, with an emphasis on general relativistic magneto-hydrodynamics simulations. We are particularly interested in relativistic magneto-hydrodynamics simulations of accretion disks around supermassive black hole mergers, and binary neutron star coalescences from prior to merger through to the formation of disks and/or collapse of the merged remnant, the production of jets, and launching of outflows. We are also interested perform ``event-based'' simulations, using parameters informed by specific LIGO/Virgo detections, and thereby permitting much closer comparison with observables, in order to interpret current and future multi-messenger observations by a wide array of current and future detectors. The successful postdoctoral candidates will be Fellows of a new prestigious "Frontier in Gravitational-Wave Astrophysics" (FGWA) Program. Initially appointed for two or three years, the Fellows are renewable up to five years depending on satisfactory performance and the availability of funds. Senior scientists in the group includes Manuela Campanelli (Director), Joshua Faber, Carlos Lousto, Richard O'Shaughnessy, Jason Nordhaus, Yosef Zlochower, Sukanya Chakrabarti, John Whelan, and Hans-Peter Bischof, 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 is involved in several large collaborations, including the LIGO Scientific Collaboration (LSC), The Einstein Toolkit Consortium (http://einsteintoolkit.org) and a NASA Theoretical and Computational Astrophysics Network (TCAN). CCRG researchers have access to several computing cluster facilities at national computing centers such as XSEDE and the NCSA's Blue Waters Supercomputer (with an allocation of over 160MSUs), as well as a dedicated over 3000-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: manuela[AT]astro[dot]rit[dot]edu with a copy 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 January and no later than September, 2019. RIT is committed to equal employment opportunity and affirmative action.

1 0

meeting minutes for 2018-06-25
by Roland Haas 25 Jun '18

25 Jun '18

Present: Roland, Bhavesh, Helvi, Sam, Yosef, Gabrielle, Shawn, Daniel ET meeting summary: * workshop documents: * Bhavesh provided a summary of the workshop: http://et-workshop18.physics.gatech.edu/ * https://docs.google.com/presentation/d/1Khljxtz9WGBcZHuZ2PDC1PpzyGXE4daZ-P9… * links in that document provide more detailed updates. * education and outreach: ** mainly talked about difficulty of new users to compile and run the code ** difficulty to get and understand a parameters file ** barrier to get help on the user mailing list ** Gabrielle will send link with document to Bhavesh * benchmarking: ** Deborah and Eric agreed to test optimizations ** need to provide access to clusters of interest ** Stampede2, Comet, Blue Waters, MareNostrum ET infrastructure: * issues persist, currently only persons who have an existing CCT or wiki account can edit the wiki. Edits by non-logged in users are no longer possible. 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 .

1 0

Einstein Toolkit Meeting Reminder
by Roland Haas 23 Jun '18

23 Jun '18

Hello all, Please consider joining the weekly Einstein Toolkit phone call at 9:00 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 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://keys.gnupg.net.

1 0

Slow reading of Carpet data in visit 2.13
by Yosef Zlochower 22 Jun '18

22 Jun '18

Hi, I was trying to load CarpetIOHDF5 2D data with visit 2.10 and 2.13. I compiled both using the build_visit scripts with the --hdf5 option. The 2.13 takes much longer to load. For example, with a file containing 3 timelevels, 2.10 takes under a second to load, and 2.13 takes about 7 seconds. This gets much worse as the number of time levels is increased. It took 2 minutes to open a file with 10 timelevels in 2.13, but under a second with 2.10 Has anyone else seen this? Is there a workaround? -- Dr. Yosef Zlochower Center for Computational Relativity and Gravitation Associate Professor School of Mathematical Sciences Rochester Institute of Technology 85 Lomb Memorial Drive Rochester, NY 14623 Office:74-2067 Phone: +1 585-475-6103 yosef(a)astro.rit.edu CONFIDENTIALITY NOTE: The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and destroy any copies of this information.

3 6

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

Users June 2018