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From "Jukka Zitting (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (JCR-3064) Concurrent access performance drop
Date Wed, 09 Nov 2011 11:38:51 GMT

     [ https://issues.apache.org/jira/browse/JCR-3064?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jukka Zitting updated JCR-3064:
-------------------------------

    Attachment: ConcurrentReadWriteTest-2.3.png
                ConcurrentReadTest-2.3.png

I ran the performance tests over all Jackrabbit trunk commits since 2.2 was branched. The
attached -2.3.png graphs show a pretty clear increase around revisions 1043xxx.

The table below shows the median timings for each Jackrabbit revision in this period after
which the performance again settles to a stable though slower state.

    revision  read    r/w
    =====================
    1043084   111     127
    1043085   136     132
    1043086   124     128
    1043088   119     150
    1043343   129     136
    1043357   128     138
    1043358   124     140
    1043430   477    1899
    1043541   112     122
    1043545   106     115
    1043546   109     119
    1043554   496    1947
    1043555   110     128
    1043598   112     120
    1043616   579    2127
    1043618   499    1722
    1043623   114     124
    1043637   504    1997
    1043642   106     137
    1043656   536    2040
    1043657   108     123
    1043663   105     135
    1043893   506    2058
    1043897   479    1885

                
> Concurrent access performance drop
> ----------------------------------
>
>                 Key: JCR-3064
>                 URL: https://issues.apache.org/jira/browse/JCR-3064
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>            Reporter: Jukka Zitting
>            Priority: Blocker
>             Fix For: 2.4
>
>         Attachments: ConcurrentReadTest-2.3.png, ConcurrentReadTest-2011.png, ConcurrentReadTest.png,
ConcurrentReadWriteTest-2.3.png, ConcurrentReadWriteTest-2011.png, ConcurrentReadWriteTest.png,
JCR-3064-EntryCollector.patch, visualvm-ConcurrentReadTest-2.2.png, visualvm-ConcurrentReadTest-2.3.png
>
>
> Our performance tests show a pretty bad drop in concurrent access performance (both read
and write) in the latest trunk when compared to Jackrabbit 2.2. We need to track down the
cause and fix it before the 2.3 release.

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