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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (LUCENE-893) Increase buffer sizes used during searching
Date Sun, 10 Mar 2013 13:21:14 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Erick Erickson closed LUCENE-893.
---------------------------------

    Resolution: Won't Fix

SPRING_CLEANING_2013 We can reopen if necessary. Think this code has been extensively re-worked
anyway.
                
> Increase buffer sizes used during searching
> -------------------------------------------
>
>                 Key: LUCENE-893
>                 URL: https://issues.apache.org/jira/browse/LUCENE-893
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>    Affects Versions: 2.1
>            Reporter: Michael McCandless
>
> Spinoff of LUCENE-888.
> In LUCENE-888 we increased buffer sizes that impact indexing and found
> substantial (10-18%) overall performance gains.
> It's very likely that we can also gain some performance for searching
> by increasing the read buffers in BufferedIndexInput used by
> searching.
> We need to test performance impact to verify and then pick a good
> overall default buffer size, also being careful not to add too much
> overall HEAP RAM usage because a potentially very large number of
> BufferedIndexInput instances are created during searching
> (# segments X # index files per segment).

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