[docs] [issue24318] Better documentaiton of profile-opt (and release builds in general?)

[Joachim Wagner]

Joachim Wagner <jwagner at computing.dcu.ie> added the comment:

The readme in 3.6.5 has a section on PGO but the sentence "If ran,
``make profile-opt`` will do several steps." can be misunderstood that one has to run this command instead of "make" after "configure --enable-optimizations". Furthermore, a 2015 post suggests that most Linux distributions use a different workload than the one provided for much better results. The readme should talk about this, either clarifying that this issue has been resolved or making recommendations for the workload. (I understand that licence incompatibilities or the size of the workload may be reasons for not including the recommended workload in the source distribution.)

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nosy: +jwagner

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<https://bugs.python.org/issue24318>
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