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From "Michael McCandless (JIRA)" <>
Subject [jira] Created: (LUCENE-893) Increase buffer sizes used during searching
Date Fri, 25 May 2007 19:44:16 GMT
Increase buffer sizes used during searching

                 Key: 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

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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