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https://issues.apache.org/jira/browse/LUCENE-893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12499222
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Doug Cutting commented on LUCENE-893:
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> large number of BufferedIndexInput instances are created during searching
> (# segments X # index files per segment)
The biggest factor is frequently the number of terms in the query.
> 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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