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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-893) Increase buffer sizes used during searching
Date Sat, 26 May 2007 13:40:16 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12499313
] 

Yonik Seeley commented on LUCENE-893:
-------------------------------------

Do you have any results for non-compound format?

Perhaps CFS may have bigger gains because all CSIndexInput share the same base FSIndexInput,
hence CFS needs to call file.seek() more often, even for sequential reads on a particular
CSIndexInput?

> Increase buffer sizes used during searching
> -------------------------------------------
>
>                 Key: LUCENE-893
>                 URL: https://issues.apache.org/jira/browse/LUCENE-893
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>    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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