Daniel Becker has posted comments on this change. ( http://gerrit.cloudera.org:8080/13807 )
Change subject: IMPALA-8741: Speed up bit unpacking by vectorisation ...................................................................... Patch Set 12: (2 comments) http://gerrit.cloudera.org:8080/#/c/13807/4/be/src/util/bit-packing.h File be/src/util/bit-packing.h: http://gerrit.cloudera.org:8080/#/c/13807/4/be/src/util/bit-packing.h@67 PS4, Line 67: template <typename OutType, bool VECTORIZE = true> > I made measurements and a graph and added it to the Jira issue: Csaba had an idea that we could get rid of the VECTORIZE parameter completely and test the non-vectorised code path by disabling the CPU flags in CpuInfo in the tests. http://gerrit.cloudera.org:8080/#/c/13807/4/be/src/util/bit-packing.inline.h File be/src/util/bit-packing.inline.h: http://gerrit.cloudera.org:8080/#/c/13807/4/be/src/util/bit-packing.inline.h@84 PS4, Line 84: if (LIKELY((std::is_same<OutType, uint8_t>::value > Does it even make sense to unpack values into a different type outside of t We also use bool somewhere, at least bit-packing.cc instantiates the methods with bool. -- To view, visit http://gerrit.cloudera.org:8080/13807 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I9e452a547973778bbd8d768c608e1a32e948f947 Gerrit-Change-Number: 13807 Gerrit-PatchSet: 12 Gerrit-Owner: Daniel Becker <[email protected]> Gerrit-Reviewer: Csaba Ringhofer <[email protected]> Gerrit-Reviewer: Daniel Becker <[email protected]> Gerrit-Reviewer: Impala Public Jenkins <[email protected]> Gerrit-Reviewer: Tim Armstrong <[email protected]> Gerrit-Comment-Date: Mon, 22 Jul 2019 11:47:06 +0000 Gerrit-HasComments: Yes
