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--- documentation:parallel [2025/11/19 21:56] – external edit 127.0.0.1
+++ documentation:parallel [2026/08/06 13:21] (current) – Maurits W. Haverkort
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-Quanty (at least the linux version, the mac version will follow when xcode / clang starts to suport omp again) is a parallel code that can use many cores using a shared memory setup. In a bash shell you can tell the code how many thread it can use by setting the system variable OMP_NUM_THREADS before you run the code
+Quanty is a parallel code that can use several cores using a shared memory setup. In a bash shell you can tell the code how many thread it can use by setting the system variable OMP_NUM_THREADS before you run the code
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-That’s all. If you have the hardware all the suden your calculations are 16 times faster.
+That’s all. Note that for a few number of cores the code normally scales well, i.e. 16 cores compared to 1 is about 16 times faster. For many cores this scaling is no longer valid. For a large number of calculations you need to test the optimum on your machine.
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