Guido van Rossum schrieb am 22.08.2015 um 18:55: > Regarding the training set, I agree that regrtest sounds to be better than > pybench. If we make this an opt-in change, we can experiment with different > training sets easily. (Also, I haven't seen the patch yet, but I presume > it's easy to use a different training set? It's just one command in one line, yes. > Experimentation should be encouraged.) A well chosen training set can have a notable impact on PGO compiled code in general, and switching from pybench to regrtests should make such a difference. However, since CPython's overall performance is mostly determined by the interpreter loop, general object operations (getattr!) and the basic builtin types, of which the regression test suite makes plenty of use, it is rather unlikely that other training sets would provide substantially better performance for Python code execution. Note also that Ubuntu has shipped PGO builds based on the regrtests for years, and they seemed to be quite happy with it. Stefan
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