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https://issues.apache.org/jira/browse/HBASE-20875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546016#comment-16546016
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ramkrishna.s.vasudevan commented on HBASE-20875:
------------------------------------------------
In the jitviewer also noticed that in the hot path (in read path in this case)
there are instances where it says 'callee too big' because of which inlining
does not happen.
> MemStoreLABImp::copyIntoCell uses 7% CPU when writing
> -----------------------------------------------------
>
> Key: HBASE-20875
> URL: https://issues.apache.org/jira/browse/HBASE-20875
> Project: HBase
> Issue Type: Sub-task
> Components: Performance
> Affects Versions: 2.0.1
> Reporter: stack
> Assignee: stack
> Priority: Major
> Fix For: 2.0.2
>
> Attachments:
> 0001-HBASE-20875-MemStoreLABImp-copyIntoCell-uses-7-CPU-w.patch,
> 2.0707.baseline.91935.cpu.svg, 2.0711.patched.145414.cpu.svg,
> HBASE-20875.master.001.patch, HBASE-20875.master.002.patch, Screen Shot
> 2018-07-11 at 9.52.46 PM.png
>
>
> Looks like this with a PE random write loading:
> {code}
> ./hbase/bin/hbase --config ~/conf_hbase
> org.apache.hadoop.hbase.PerformanceEvaluation --nomapred --presplit=40
> --size=30 --columns=10 --valueSize=100 randomWrite 200
> {code}
> ... against a single server.
> {code}
> 12.47% perf-91935.map
> [.] Lorg/apache/hadoop/hbase/BBKVComparator;::compare
> 10.42% libjvm.so
> [.]
> ParNewGeneration::copy_to_survivor_space_avoiding_promotion_undo(ParScanThreadState*,
> oopDesc*, unsigned long, markOopDesc*)
> 6.78% perf-91935.map
> [.]
> Lorg/apache/hadoop/hbase/regionserver/MemStoreLABImpl;::copyCellInto
> ....
> {code}
> These are top CPU consumers using perf-map-agent ./bin/perf-java-top...
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