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Clean up the readme text around PGO a bit. (GH-6538) (GH-6539)

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(cherry picked from commit b87c1c92fc)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Miss Islington (bot) 2018-04-19 09:14:36 -07:00 • committed by Gregory P. Smith
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README.rst
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@ -92,15 +92,16 @@ below.
Profile Guided Optimization Profile Guided Optimization
^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^
PGO takes advantage of recent versions of the GCC or Clang compilers. If ran, PGO takes advantage of recent versions of the GCC or Clang compilers. If used,
``make profile-opt`` will do several steps. either via ``configure --enable-optimizations`` above or by manually running
``make profile-opt`` regardless of configure flags it will do several steps.
First, the entire Python directory is cleaned of temporary files that may have First, the entire Python directory is cleaned of temporary files that may have
resulted in a previous compilation. resulted in a previous compilation.
Then, an instrumented version of the interpreter is built, using suitable Then, an instrumented version of the interpreter is built, using suitable
compiler flags for each flavour. Note that this is just an intermediary step compiler flags for each flavour. Note that this is just an intermediary step.
and the binary resulted after this step is not good for real life workloads, as The binary resulting from this step is not good for real life workloads as
it has profiling instructions embedded inside. it has profiling instructions embedded inside.
After this instrumented version of the interpreter is built, the Makefile will After this instrumented version of the interpreter is built, the Makefile will