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by duohedron
912 days ago
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When I wrote some parallel code in C, enabling hyper-threading resulted only 30% increase in speed, which not too little, but you would expect more for doubling the thread count. I don't remember what was the bottleneck, but it was not I/O.
On an other occasion a consultant for a HPC consultant advised us to disable some physical cores for the optimal performance of a geological simulator application, because the core/cache ratio is higher that way. |
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