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https://issues.apache.org/jira/browse/HBASE-5527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223040#comment-13223040
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Benoit Sigoure commented on HBASE-5527:
---------------------------------------
Lars, I'm using {{nanoTime}} because it's the recommended way to measure time
in benchmarks. It uses the most accurate monotonically increasing counter the
CPU has. System time can change due to NTP adjusting the clock, leap seconds
etc.
> PerformanceEvaluation: Report aggregate timings on a single line
> ----------------------------------------------------------------
>
> Key: HBASE-5527
> URL: https://issues.apache.org/jira/browse/HBASE-5527
> Project: HBase
> Issue Type: Improvement
> Components: performance
> Affects Versions: 0.92.0
> Reporter: Benoit Sigoure
> Assignee: Benoit Sigoure
> Priority: Minor
> Attachments: 0001-PerformanceEvaluation-fixes.patch,
> 0001-PerformanceEvaluation-fixes.patch
>
>
> When running {{PerformanceEvaluation}} with {{--nomapred}} it's hard to
> locate all the lines saying {{Finished 14 in 292979ms writing 2000000 rows}}
> in the output. This change adds a couples line to summarize the run at the
> end, which makes parsing and scripting the output easier:
> {code}
> 12/03/06 00:43:58 INFO hbase.PerformanceEvaluation: [RandomWriteTest] Summary
> of timings (ms): [15940, 15776, 15866, 15973, 15682, 15740, 15764, 15830,
> 15768, 15968, 15921, 15755, 15963, 15818, 15903, 15662]
> 12/03/06 00:43:58 INFO hbase.PerformanceEvaluation: [RandomWriteTest] Min:
> 15662ms Max: 15973ms Avg: 15833ms
> {code}
> Patch also removes a couple minor code smells.
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