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Pros: we are seeing a 10% performance boost for all python processes. Cons: The time to build python increases. This is because pgo (profile guided optimizations) need the unit tests for python to be invoked and then the entire package compiled a second time using the timing information from the unit test profiling data that is gathered. This commit sets up the src rpm environment for building python 2.7.5 - Needed to disable the tox unit test check phase since a couple tests fail due to build dependencies - Turn off dtrace and systemtap in the spec file - Use pgo for build in modules: https://bugs.python.org/issue26307 - Rollup cpython patches and add --enable-optimizations and --with-computed-gotos for optimized build These are the cpython commits pulled in: 4ff151a72a3331c514924a5e0d33747a91413fbd (Sept 18, 2015 pgo) c543a0fc3b2052c35fced09e1f96613625723508 (Jun 2 2016) (lto) 6d8fdfc84b8617476f3f497e93e9e7b6cecc5474 (Sept 8 2016) 794b2912acc1995afc6fe9501cc0ca8e56565325 (Sept 8 2016) b9999158545f3bc089b926086daa666b8e4c7caa (Nov 20) 2016 6a04ef7ceddae0930eba6cc57ba2ebfcef00abab Mar 28 2017 This still does not yield the same level of performance as a vanilla python 2.7.14 source tree which suggests there are other commits that would provide a performance boost. Change-Id: Iaddf7ead672412ad1878217ddcfaf88c9b0e2443 Signed-off-by: Al Bailey <Al.Bailey@windriver.com>
The src rpm version indicates that we are patching python 2.7.5, however there are at least 58 patches added by Centos to fix issues fixed in the later python 2.7 releases.