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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-2060) CMS should default its maxThreadCount to 1 (not 3)
Date Sat, 14 Nov 2009 11:23:39 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless resolved LUCENE-2060.
----------------------------------------

    Resolution: Fixed

> CMS should default its maxThreadCount to 1 (not 3)
> --------------------------------------------------
>
>                 Key: LUCENE-2060
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2060
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.0
>
>
> From rough experience, I think the current default of 3 is too large.  I think we get
the most bang for the buck going from 0 to 1.
> I think this will especially impact optimize on an index with many segments -- in this
case the MergePolicy happily exposes concurrency (multiple pending merges), and CMS will happily
launch 3 threads to carry that out.

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