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Uwe Schindler edited comment on LUCENE-1536 at 4/16/09 2:27 AM: ---------------------------------------------------------------- The empty docidset instance should *not* be random access :), so the only change would affect OpenBitSet to overwrite these two new methods from the default abstract class: {code} boolean isRandomAccess() { return true; } boolean acceptDoc(int docid) { return fastGet(docid); /* possibly inlined */ } {code} was (Author: thetaphi): The empty docidset instance should *not* be random access :), so the only change would affect OpenBitSet to overwrite these two new methods from the default abstract class: {code} boolean isRandomAccess() { return true; } boolean acceptDoc(int docid) { return get(docid); /* possibly inlined */ } {code} > if a filter can support random access API, we should use it > ----------------------------------------------------------- > > Key: LUCENE-1536 > URL: https://issues.apache.org/jira/browse/LUCENE-1536 > Project: Lucene - Java > Issue Type: Improvement > Components: Search > Affects Versions: 2.4 > Reporter: Michael McCandless > Assignee: Michael McCandless > Priority: Minor > Fix For: 2.9 > > Attachments: LUCENE-1536.patch > > > I ran some performance tests, comparing applying a filter via > random-access API instead of current trunk's iterator API. > This was inspired by LUCENE-1476, where we realized deletions should > really be implemented just like a filter, but then in testing found > that switching deletions to iterator was a very sizable performance > hit. > Some notes on the test: > * Index is first 2M docs of Wikipedia. Test machine is Mac OS X > 10.5.6, quad core Intel CPU, 6 GB RAM, java 1.6.0_07-b06-153. > * I test across multiple queries. 1-X means an OR query, eg 1-4 > means 1 OR 2 OR 3 OR 4, whereas +1-4 is an AND query, ie 1 AND 2 > AND 3 AND 4. "u s" means "united states" (phrase search). > * I test with multiple filter densities (0, 1, 2, 5, 10, 25, 75, 90, > 95, 98, 99, 99.99999 (filter is non-null but all bits are set), > 100 (filter=null, control)). > * Method high means I use random-access filter API in > IndexSearcher's main loop. Method low means I use random-access > filter API down in SegmentTermDocs (just like deleted docs > today). > * Baseline (QPS) is current trunk, where filter is applied as iterator up > "high" (ie in IndexSearcher's search loop). -- 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: java-dev-unsubscr...@lucene.apache.org For additional commands, e-mail: java-dev-h...@lucene.apache.org