Joe McDonnell has submitted this change and it was merged. ( http://gerrit.cloudera.org:8080/21721 )
Change subject: IMPALA-13308: Build GCC with profile guided optimization ...................................................................... IMPALA-13308: Build GCC with profile guided optimization GCC has an option to build itself using profile guided optimization. It collects a profile while building itself and then uses that to optimize the binary. This seems to be enough to speed up Impala compilation by about 5%: Current toolchain GCC (LTO): real 4m58.416s user 70m41.989s sys 6m41.961s GCC with PGO, no LTO: real 4m45.360s user 67m12.081s sys 6m40.376s LTO shows little improvement over the PGO numbers, so this switches back to a non-LTO build to save build time. Avoiding LTO and using a slightly faster GCC reduces the total build time by 35 minutes on an internal job. Testing: - Ran a build, then used it to build Impala Change-Id: I9f5850999b05207ddc008d839de2783579eaaf31 Reviewed-on: http://gerrit.cloudera.org:8080/21721 Reviewed-by: Michael Smith <[email protected]> Tested-by: Joe McDonnell <[email protected]> --- M source/gcc/build.sh 1 file changed, 3 insertions(+), 2 deletions(-) Approvals: Michael Smith: Looks good to me, approved Joe McDonnell: Verified -- To view, visit http://gerrit.cloudera.org:8080/21721 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: native-toolchain Gerrit-Branch: master Gerrit-MessageType: merged Gerrit-Change-Id: I9f5850999b05207ddc008d839de2783579eaaf31 Gerrit-Change-Number: 21721 Gerrit-PatchSet: 2 Gerrit-Owner: Joe McDonnell <[email protected]> Gerrit-Reviewer: Joe McDonnell <[email protected]> Gerrit-Reviewer: Michael Smith <[email protected]>
