Hi Michel, Setting KNOB_MAX_WORKER_THREADS to 1 fixed the oversubscription of threads and the memory consumption issue when the number of mpi processes is equal to the number of cores requested.
Great! If I do not allow threading of swr by setting KNOB_MAX_WORKER_THREADS to 1 (basically serial swr vs serial llvmpipe), do you know which performance gain I could still expect by relying only on a potential better usage of the AVX instructions? Short answer: swr is marginally faster because of instruction set optimizations but way faster because of better thread scaling. Long answer: With Mesa 11.x and 12.x, our experimental data showed similar single threaded performance between the two, however, swr in 13.x (currently deployed with 5.2) saw a significant performance increase between 20% - 100% depending on the workload. Multithreaded performance, however, is quite another story. Swr scales nearly linearly on Haswell CPUs for both geometry and pixel operations while llvmpipe scales well up to 16c for pixel operations and is entirely single-threaded for geometry shaders. Coincidentally, most actions in paraview are geometry based (volume rendering being the exception). So, in general, swr will perform better than llvmpipe by a fair amount and if using it in multi-threading mode then by a drastic amount. - Chuck
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