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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/02/01 13:12:00 UTC
[jira] [Work logged] (BEAM-11727) Optimize ExecutionStateSampler
[ https://issues.apache.org/jira/browse/BEAM-11727?focusedWorklogId=545318&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-545318 ]
ASF GitHub Bot logged work on BEAM-11727:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Feb/21 13:11
Start Date: 01/Feb/21 13:11
Worklog Time Spent: 10m
Work Description: scwhittle opened a new pull request #13861:
URL: https://github.com/apache/beam/pull/13861
…rdering
and concurrent data struture, when most accesses are already synchronized.
Additionally reduce the scope synchronized block for the remove case to not
include getting the current time.
**Please** add a meaningful description for your change here
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Issue Time Tracking
-------------------
Worklog Id: (was: 545318)
Remaining Estimate: 0h
Time Spent: 10m
> Optimize ExecutionStateSampler
> ------------------------------
>
> Key: BEAM-11727
> URL: https://issues.apache.org/jira/browse/BEAM-11727
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Showed up as 1.5% of CPU on Nexmark 11 streaming benchmark run.
> It appears to be using a ConcurrentSkipListSet and most of the cpu is relatedd to inserts/removes in that, involving the system hash of the entries as that is used for ordering.
> The consistent ordering is unnecessary. Additionally for other reasons, removal and iteration is already synchronized and so performance will likely be better just using a synchronized HashMap and synchronizing in the add case.
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