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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7868) HFile performance regression 92/94
Date Sun, 17 Feb 2013 15:17:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580196#comment-13580196
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Matteo Bertozzi commented on HBASE-7868:
----------------------------------------

[~ted_yu] graph 8 is the average of the 7 runs

This graphs were done this morning on my machines, so I expect weird runs.
but you can get the same results on a proper machine.
(I've started benchmarking this stuff days ago, and I always got the same avg results)
                
> HFile performance regression 92/94
> ----------------------------------
>
>                 Key: HBASE-7868
>                 URL: https://issues.apache.org/jira/browse/HBASE-7868
>             Project: HBase
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.94.5
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>         Attachments: hfileperf-graphs.png
>
>
> By HFilePerformanceEvaluation seems that 0.94 is slower then 0.92
> Looking at the profiler seems that most of the time, compared to 92, is spent in the
metrics dictionary lookup. [~eclark] pointed out the new per family/block metrics.
> By commenting the metrics call in HFileReaderV2, the performance seems to get better,
but maybe metrics is not the only problem.

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