[ https://issues.apache.org/jira/browse/IMPALA-8737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joe McDonnell reassigned IMPALA-8737: ------------------------------------- Assignee: Joe McDonnell > Patch gperftools to fix O(n) scaling in PageHeap::AllocLarge() > -------------------------------------------------------------- > > Key: IMPALA-8737 > URL: https://issues.apache.org/jira/browse/IMPALA-8737 > Project: IMPALA > Issue Type: Bug > Components: Backend > Affects Versions: Impala 3.3.0 > Reporter: Joe McDonnell > Assignee: Joe McDonnell > Priority: Major > Fix For: Impala 4.0 > > > TCMalloc's PageHeap::AllocLarge() has O( n ) behavior. As the heap gets > fragmented, this O( n ) behavior can lead to contention, because the thread > executing PageHeap::AllocLarge() is holding a lock. In recent versions of > gperftools, this code has been modified to have O(log n) behavior. This could > reduce contention significantly in some cases. > We can get this fix by using a more modern version of gperftools (see > https://issues.apache.org/jira/browse/IMPALA-6784 ). However, the patches for > the O(log n) behavior are fairly contained. Here are the two patches needed: > [https://github.com/gperftools/gperftools/commit/06c9414ec423ffe442c047b2560555f9d5847b1d] > [https://github.com/gperftools/gperftools/commit/f1d3fe4a21e339a3fd6e4592ee7444484a7b92dc] > These would be easy to port to gperftools-2.5. This Jira tracks that effort > (which is separate and would be superseded if we upgrade gperftools). -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org