Lumerical does not support GPU acceleration. Best option is a multi-processor computer. These systems provide good performance because each processor has it's own memory bus connection to the RAM.Simulation speeds are typically limited by the memory bandwidth between RAM and processor, so having one memory bus per processor means the simulation speed tends to scale well with the number of processors. See this this post for more information. This post on our FDTD tests/benchmarks might come handy.
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