A new parallel simulation technique

Abstract

We develop a "semi-parallel" simulation technique suggested by Pretorius and Lehner, in which the simulation spacetime volume is divided into a large number of small 4-volumes which have only initial and final surfaces. Thus there is no two-way communication between processors, and the 4-volumes can be simulated independently without the use of MPI. This technique allows us to simulate much larger volumes than we otherwise could, because we are not limited by total memory size. No processor time is lost waiting for other processors. We compare a cosmic string simulation we developed using the semi-parallel technique with our previous MPI-based code for several test cases and find a factor of 2.6 improvement in the total amount of processor time required to accomplish the same job for strings evolving in the matter-dominated era.

22 pages, 7 figures, 3 tables

References in corpus (6)

• Large parallel cosmic string simulations: New results on loop production
• Cosmic string loops in the expanding universe
• Analytic Study of Small Scale Structure on Cosmic Strings
• Cosmic String Structure at the Gravitational Radiation Scale
• Cosmic String Loops, Large and Small
• Reionization from cosmic string loops

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• Large parallel cosmic string simulations: New results on loop production
• Cosmic string loop shapes
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• Radio Broadcasts from Superconducting Strings
• CMB Distortions from Superconducting Cosmic Strings
• Constraining topological defects with temperature and polarization anisotropies
• Cosmic Strings as Emitters of Extremely High Energy Neutrinos
• Constraints on Superconducting Cosmic Strings from Early Reionization
• Detection of Low Tension Cosmic Superstrings
• Correlations between cosmic strings and extra relativistic species
• Breaking the Strings: the signatures of Cosmic String Loop Fragmentation