Game Development Reference
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Figure 7.15. A screenshot from a real-time simulation using 500,000 particles on four
GPUs. The simulation domain is split by planes perpendicular to the x -axis. The different
particle colors show on which GPU they are calculated (see Color Plate IX).
7.7 Conclusion
In this chapter, we have discussed techniques to use multiple processors with dis-
tributed memory for a particle-based simulation. The performance of the method
scales well to the number of processors when particles are distributed evenly on
each computation domain. However, the performance is not good when the parti-
cle distribution is not uniform because it uses a fixed decomposition of the com-
putation domain. Dynamic load balancing is something to be considered in future
work, but it would be possible by using the data calculated for the sliced grid
because it has histograms of the particle distribution in the sliced direction.
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