Small speedups to DocumentsWriter's quickSort
---------------------------------------------
Key: LUCENE-1211
URL: https://issues.apache.org/jira/browse/LUCENE-1211
Project: Lucene - Java
Issue Type: Bug
Components: Index
Affects Versions: 2.3.1, 2.3
Reporter: Michael McCandless
Assignee: Michael McCandless
Priority: Minor
Fix For: 2.4
In working on LUCENE-510 I found that DocumentsWriter's quickSort can
be further optimized to handle the common case of sorting only 2
values.
I ran with this alg:
analyzer=org.apache.lucene.analysis.standard.StandardAnalyzer
doc.maker=org.apache.lucene.benchmark.byTask.feeds.LineDocMaker
docs.file=/Volumes/External/lucene/wiki.txt
doc.stored = true
doc.term.vector = true
doc.add.log.step=2000
doc.maker.forever = false
directory=FSDirectory
autocommit=false
compound=false
ram.flush.mb=64
{ "Rounds"
ResetSystemErase
{ "BuildIndex"
CreateIndex
{ "AddDocs" AddDoc > : 200000
- CloseIndex
}
NewRound
} : 5
RepSumByPrefRound BuildIndex
Best of 5 was 857.3 docs/sec before the optimization and 881.6 after =
2.8% speedup, on a quad-core Mac Pro with 4-drive RAID 0 array.
The fix is trivial. I will commit shortly.
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