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Date: Tue, 6 Mar 2012 07:00:59 +0000 (UTC)
From: "Benoit Sigoure (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5527) PerformanceEvaluation: Report
 aggregate timings on a single line
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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 ] 

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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