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Michael Busch commented on LUCENE-893: -------------------------------------- > Do you have any results for non-compound format? I converted the index to non-cfs format and reran the same test, varying the readBufferSize (i. e. the buffer size for all input streams). Results for conjunction queries: 1 KB: Time: 52422 ms. 2 KB: Time: 47718 ms. 4 KB: Time: 50078 ms. 8 KB: Time: 54719 ms. Results for disjunction queries: 1 KB: Time: 291000 ms. 2 KB: Time: 266110 ms. 4 KB: Time: 258844 ms. 8 KB: Time: 279812 ms. The results look similar to compound format here. Again 2 KB looks like the best value. > 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). -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]