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>
45d4657f3d