A new parallel simulation technique

Details A new parallel simulation technique A new parallel simulation technique

2010-11-17

arxiv.org/abs/1011.4046v1

Journal of Computational Physics 231 (2012) 98-108

Physics

Computational Physics

22 pages, 7 figures, 3 tables

Scientific paper

10.1016/j.jcp.2011.08.029

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.

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