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https://issues.apache.org/jira/browse/IMPALA-5988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-5988.
-----------------------------------
Resolution: Fixed
Fix Version/s: Impala 2.11.0
IMPALA-5988: optimise MemPool::TryAllocate()
Testing:
Ran core tests.
Perf:
Experiments using this on top of a WIP Avro patch for IMPALA-5307
showed noticable improvements in CPU efficiency - up to 10%
Change-Id: I088012084fe535a67a3cd1103ced5a02027f961a
Reviewed-on: http://gerrit.cloudera.org:8080/8145
Reviewed-by: Tim Armstrong <[email protected]>
Tested-by: Impala Public Jenkins
> Improve MemPool::TryAllocate() efficiency for small strings
> -----------------------------------------------------------
>
> Key: IMPALA-5988
> URL: https://issues.apache.org/jira/browse/IMPALA-5988
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Labels: perf
> Fix For: Impala 2.11.0
>
>
> There are some places in the code where we allocate many small strings from
> MemPool::TryAllocate(). The code is not particularly well optimised for this
> case. Specifically:
> * We always realign to the default alignment even when alignment isn't
> required.
> * The fast path through the code could be streamlined.
> I noticed this while working on IMPALA-5307 where I'm adding extra calls to
> allocate strings per-row.
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