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December 2012

16 participants
12 discussions

Estimation of memory
by Pengfei Chen 05 Dec '12

05 Dec '12

Hi all, I'm trying to do MergerTree for 10 snapshots on Nautilus. Each of the snapshots has around 500,000,000 particles. I tried #PBS -l ncpus=256 #PBS -l mem=1024GB #PBS -l walltime=12:00:00 but it ended 11 minutes later with the error: MPI WARNING: Could not allocate an internal buffer in the last 30 seconds on rank 184. Try increasing MPI_BUFS_PER_PROC and/or MPI_BUFS_PER_HOST. Could someone please give me an estimation about how much memory I need to use? Thanks! Pengfei

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Enzo 2.2 Public Release
by Michael Kuhlen 01 Dec '12

01 Dec '12

Enzo 2.2 Nov. 30, 2012 We are proud to announce the public release of Enzo version 2.2. This intermediate release contains several new physics modules, reorganized and updated documentation, revamped answer testing, improvements to code infrastructure, as well as numerous bug fixes. In a little bit more detail: 1. New physics capabilities — (a) Thermal and chemical feedback from Type Ia supernovae, with mass loss and luminosity fits provided by K. Nagamine; (b) H2-regulated star formation, in which the star formation rate is proportional to the density of molecular hydrogen (determined from Krumholz, McKee, & Tumlinson 2009), rather than total gas density. 2. Upgrades to the Enzo Answer Testing Framework — Includes both functional improvements and vastly improved documentation. The results of two test suites ("quick" and "pull") have been uploaded to an Amazon Cloud instance, allowing users to compare to an Enzo Community "gold standard". Alternatively, answer testing can also be done by comparing to local results. 3. Improved Documentation — (a) Descriptions of 175 previously undocumented parameters; (b) Parameters have been broken up into groups; (c) Brief explanations of the functionality provided by (most) Enzo source files; (d) Description of the new Enzo performance timers; (e) Examples of how to debug Enzo. 4. Code infrastructure improvement — All Fortran routines have been modified to explicitly specify the type at compile time, eliminating the need for compiler flags to ensure 64-bit precision. 5. Timing and performance measurement and plotting tools — Support for simple, lightweight measurements for the timing and performance of Enzo. This allows one to examine which functions are using the majority of the simulation runtime, and how this varies across multiple processors. 6. Bug Fixes - see the Enzo 2.2 Changelog at http://enzo-project.org/ReleaseNotes.html With this release we continue our efforts to consolidate The Enzo Project's web presence, with the goal of lowering the barrier to entry for new users and easing further code development: * Enzo's main webpage continues to be http://enzo-project.org. Links and information can be found here for both developers and general users. * Both stable (https://bitbucket.org/enzo/enzo-stable) and development ( https://bitbucket.org/enzo/enzo-dev) versions of the Enzo code are now hosted on Bitbucket. * For news and updates please follow our google+ page: The Enzo Project ( https://plus.google.com/115923030596894217717) The Enzo Development Team -- ********************************************************************* * * * Dr. Michael Kuhlen Theoretical Astrophysics Center * * email: mqk(a)astro.berkeley.edu UC Berkeley * * cell phone: (831) 588-1468 B-116 Hearst Field Annex # 3411 * * skype username: mikekuhlen Berkeley, CA 94720 * * * *********************************************************************

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