Parallelized the /examples/performance_test_voxels.cpp example - now every...
Parallelized the /examples/performance_test_voxels.cpp example - now every process updates its central voxel. A bit unfair for the parallel version but the major work done is in comparison and not writing a single voxel substrate density. To let a single process (the appropriate process which conatins the central voxel would be unfair as ALL processes must execute i.e. the ENTIRE DOMAIN must be covered). Further, it is very difficult to change the signature of the supply function and target function pointers - this will need a change in the core files of BioFVM which would break the other examples. This is also UNDESIRABLE as this is "just" a performance test and not a "real" example. The output is produced in a scaling_*.txt file.
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