Users July 2010

users@lists.einsteintoolkit.org

14 participants
16 discussions

Difference in NaN checks results of GRHydro
by Hee Il Kim 18 Jul '10

18 Jul '10

Hi, Recently, I found the nancheks of GRHydro show different results sometimes depending on the compilers and codes. As far as I've tested, nans appear only if I use the private thorn GRHydro_RNSID (just a clone of Whisky_RNSID) with XL compilers on AIX machines. I don't see any nans with Intel compilers for the same parfile. Also old Whisky with BSSN_MoL passes the nanchecks safely. The difference happens actually for somewhat specific situations. It only happens for differentially rotating stars. It disappears if I take a smaller # of refinement levels. I've tested it applying the IEEE strict floating point options to both compilers (Intel and XL), but the results were same. Since the problem doesn't happen for Whisky+BSSN_MoL, I think it is not the problem of the private thorn only. My GRHydro_RNSID is basically the same with Whisky_RNSID. Assuming most of you are using the similar thorn, I attached the thornlist and the parfile. I hope you can examine and fix the problem. Regards, Hee Il

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Meeting reminder
by Frank Loeffler 12 Jul '10

12 Jul '10

Hi, this is a short reminder about the regular EinsteinToolkit phone call later today (at 10am CDT). Instructions how to join the call can be found here: http://einsteintoolkit.org/info/support/ Frank Loeffler

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Patch: add hydro variables support for the CactusNumerical/Noise thorn
by David Radice 09 Jul '10

09 Jul '10

Dear all, in order to use the CactusNumerical/Noise thorn to perform a stress test on the hydro equations "id_noise" has to be properly scheduled with respect to HydroBase_Initial and HydroBase_Prim2ConInitial. As it is now numerical perturbation on the hydro variables could be discarded / overwritten. The attached (trivial) patch fixes the above mentioned issue and includes some small aesthetic fixes. Could you please consider applying it to the development branch of the Einstein Toolkit? Thanks, David PS: note that the hydro thorn has to schedule Prim2Con in HydroBase_Prim2ConInitial otherwise the perturbation are simply ignored/overwritten. -- David Radice Max Planck Institute for Gravitational Physics Albert Einstein Institute Am Muehlenberg 1 D-14476 Potsdam Germany Tel : +49 331 567 7242 Fax : +49 331 567 7499 Room : 1.64 E-Mail : david.radice(a)aei.mpg.de

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Einstein Toolkit Presentation at GR19
by Erik Schnetter 06 Jul '10

06 Jul '10

Dear Einstein Toolkit Users I will give a presentation on the Einstein Toolkit at the GR19 conference <http://www.gr19.com> in session B2 "Numerical Relativity and Astrophysical Applications". I will speak on Thursday at 14:30 in room 1 (the plenary room). I believe the schedule on the web site is outdated -- please look for on-site schedules that should be more accurate. Title: The Einstein Toolkit Authors: Erik Schnetter for the Einstein Toolkit Consortium We introduce the Einstein Toolkit, a collection of software components and tools for simulating and analyzing general relativistic astrophysical systems. Such systems include gravitational wave space-times, collisions of compact objects such as black holes or neutron stars, accretion onto compact objects, core collapse supernovae and Gamma-Ray Bursts. This toolkit is developed as open software for relativistic astrophysics. Our aim is to provide the core computational tools that can enable new science, broaden our community, facilitate interdisciplinary research and take advantage of emerging petascale computers and advanced cyberinfrastructure. We believe that this toolkit can also be constructively used in teaching numerical relativity courses, and can help "getting started" in numerical relativity research. The Einstein Toolkit builds on numerous software efforts in the numerical relativity community including CactusEinstein, Whisky, and Carpet. The Einstein Toolkit currently uses the Cactus Framework as the underlying computational infrastructure that provides large-scale parallelization, general computational components, and a model for collaborative, portable code development. We give a brief overview over the toolkit, its goals, and its current state, and show examples of scientific results obtained by various research groups employing this toolkit as basis of their research codes. -erik -- Erik Schnetter <schnetter(a)cct.lsu.edu> http://www.cct.lsu.edu/~eschnett/

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Benchmark parameter files?
by Erik Schnetter 02 Jul '10

02 Jul '10

For various occasions it is nice to have HPC benchmark parameter files. This could be for comparing different TeraGrid systems, or could be for evaluating workstations or clusters that one wants to buy. It would be convenient to have a few "standard" Einstein Toolkit benchmarks available. If you have run such benchmarks in the past, would you mind sending your corresponding parameter files around, or adding them to the wiki? I'm not interested in the details, but rather in what features people considered important in such benchmarks. -erik -- Erik Schnetter <schnetter(a)cct.lsu.edu> http://www.cct.lsu.edu/~eschnett/

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GetComponents doesn't handle repository declarations without thorns
by Erik Schnetter 01 Jul '10

01 Jul '10

I had the following lines in my thorn list: # Private thorns !TARGET = $ARR !TYPE = ignore !CHECKOUT = Note that the checkout item is empty. GetComponents reports two errors: $ utils/Scripts/GetComponents --update --root=. manifest/einsteintoolkit.th Odd number of elements in hash assignment at utils/Scripts/GetComponents line 335. Use of uninitialized value in split at utils/Scripts/GetComponents line 441. It should instead either report an error, or handle the case of a repository without thorns correctly. -erik -- Erik Schnetter <schnetter(a)cct.lsu.edu> http://www.cct.lsu.edu/~eschnett/

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Users July 2010