Alex Behm has posted comments on this change. ( http://gerrit.cloudera.org:8080/8085 )
Change subject: IMPALA-5307: part 1: don't transfer disk I/O buffers out of parquet ...................................................................... Patch Set 6: (1 comment) http://gerrit.cloudera.org:8080/#/c/8085/6//COMMIT_MSG Commit Message: http://gerrit.cloudera.org:8080/#/c/8085/6//COMMIT_MSG@44 PS6, Line 44: There is a significant regression (50% increase in runtime) in Do we understand where the regression comes from exactly? Somehow I find it hard to believe a 50% overhead just from copying. Is it maybe another tcmalloc issue where different threads allocate/free the memory? Have you tried a similar experiment with MT_DOP? -- To view, visit http://gerrit.cloudera.org:8080/8085 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I767c1e2dabde7d5bd7a4d5c1ec6d14801b8260d2 Gerrit-Change-Number: 8085 Gerrit-PatchSet: 6 Gerrit-Owner: Tim Armstrong <[email protected]> Gerrit-Reviewer: Alex Behm <[email protected]> Gerrit-Reviewer: Dan Hecht <[email protected]> Gerrit-Reviewer: Lars Volker <[email protected]> Gerrit-Reviewer: Tim Armstrong <[email protected]> Gerrit-Comment-Date: Wed, 27 Sep 2017 15:34:38 +0000 Gerrit-HasComments: Yes
