This is an update release for Pathfinder 2009.

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PyroSim now includes FDS version 5.4.1 and Smokeview version 5.4.3. For more information, please read the FDS release notes, and the Smokeview release notes.

This version of PyroSim contains a new OpenMP option to run parallel FDS simulations. Users can choose between MPI and OpenMP in the File/Preferences dialog. This choice will control the behavior of the Run Parallel option on the FDS menu. The OpenMP version of FDS automatically uses all available CPUs without requiring that the model be divided into multiple meshes. However, in our experiments, well-balanced multiple mesh parallelism using MPI gave substantially faster simulation times. The OpenMP version of FDS is included only in the 32-bit installer.

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