Joe McDonnell created IMPALA-15602:
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Summary: Switch malloc implementation to Google TCMalloc by default
Key: IMPALA-15602
URL: https://issues.apache.org/jira/browse/IMPALA-15602
Project: IMPALA
Issue Type: Improvement
Components: Backend
Affects Versions: Impala 5.0.0
Reporter: Joe McDonnell
Impala has used gperftools with aggressive decommit for many years. We have
recently added two alternatives: We support turning off aggressive decommit
with gperftools. We also support building against Google TCMalloc. Both show a
major improvement in performance over current policy.
Google TCMalloc uses a new architecture that has per-CPU caches rather than
per-thread caches. It also has sophisticated huge page handling. It holds a
slight advantage over gperftools with aggressive decommit off in performance
testing.
Upstream Impala should switch to building against Google TCMalloc by default.
Google TCMalloc does not have an aggressive decommit mode, so that
functionality would be left behind.
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