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https://issues.apache.org/jira/browse/LUCENE-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169515#comment-13169515
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Michael McCandless commented on LUCENE-3648:
--------------------------------------------
Hmm w/ current patch here I get mixed results (though, I'm only doing 4 JVM
iterations... could be if I did 10 the results improve):
No deletes:
{noformat}
Task QPS base StdDev base QPS patchStdDev patch Pct
diff
PKLookup 160.82 11.26 153.11 4.65 -13% -
5%
AndHighMed 47.23 2.46 45.37 2.32 -13% -
6%
AndHighHigh 19.51 0.90 18.82 0.90 -12% -
5%
Phrase 6.93 0.34 6.70 0.42 -13% -
7%
Fuzzy2 33.42 0.49 32.82 1.10 -6% -
3%
Respell 63.56 1.34 62.52 2.32 -7% -
4%
SloppyPhrase 9.63 0.32 9.52 0.40 -8% -
6%
TermBGroup1M1P 69.10 0.77 68.95 1.50 -3% -
3%
TermBGroup1M 25.17 0.46 25.21 0.35 -3% -
3%
Fuzzy1 83.56 1.30 83.70 2.21 -3% -
4%
Wildcard 54.04 1.87 54.17 2.59 -7% -
8%
TermGroup1M 9.80 0.19 9.87 0.06 -1% -
3%
Prefix3 21.36 0.63 21.53 0.74 -5% -
7%
IntNRQ 6.25 0.45 6.43 0.64 -13% -
21%
Term 87.43 1.16 90.09 3.98 -2% -
9%
SpanNear 19.63 1.21 20.28 0.54 -5% -
13%
OrHighMed 14.33 0.19 15.44 0.31 4% -
11%
OrHighHigh 6.75 0.10 7.30 0.15 4% -
11%
{noformat}
Deletes:
{noformat}
Task QPS base StdDev base QPS patchStdDev patch Pct
diff
Term 80.96 2.07 76.64 2.99 -11% -
0%
Prefix3 38.28 1.20 36.64 1.61 -11% -
3%
Wildcard 51.50 1.19 49.71 1.71 -8% -
2%
AndHighHigh 14.04 0.86 13.56 0.45 -12% -
6%
AndHighMed 44.42 2.45 42.90 1.57 -11% -
5%
TermBGroup1M1P 39.19 0.92 38.26 0.96 -6% -
2%
Phrase 8.32 0.34 8.16 0.13 -7% -
3%
OrHighHigh 7.82 0.42 7.69 0.20 -9% -
6%
IntNRQ 5.76 0.43 5.71 0.33 -13% -
13%
SpanNear 1.60 0.04 1.59 0.03 -4% -
3%
OrHighMed 5.82 0.41 5.79 0.12 -9% -
9%
SloppyPhrase 3.28 0.05 3.26 0.07 -4% -
3%
TermGroup1M 26.76 0.40 26.91 0.45 -2% -
3%
PKLookup 155.58 9.40 157.09 5.50 -8% -
11%
TermBGroup1M 42.88 1.04 43.30 1.19 -4% -
6%
Fuzzy1 77.96 4.29 78.94 3.16 -7% -
11%
Fuzzy2 45.14 2.58 46.23 1.62 -6% -
12%
Respell 70.96 4.78 73.57 3.78 -7% -
16%
{noformat}
Java is 1.6.0_21, running java -Xms2g -Xmx2g -server, 10M docs multi-segment
(15 segments).
> Speed up SegementDocsEnum by making it more friendly for JIT optimizations
> --------------------------------------------------------------------------
>
> Key: LUCENE-3648
> URL: https://issues.apache.org/jira/browse/LUCENE-3648
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/codecs, core/search
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3648.patch
>
>
> Since we moved the bulk reading into the codec ie. make all bulk reading
> codec private in LUCENE-3584 we have seen some performance
> [regression|http://people.apache.org/~mikemccand/lucenebench/Term.html] on
> different CPUs. I tried to optimize the implementation to make it more
> eligible for runtime optimizations, tried to make loops JIT friendly by
> moving out branches where I can, minimize member access in all loops, use
> final members where possible and specialize the two common cases With &
> Without LiveDocs.
> I will attache a patch and my benchmark results in a minute.
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