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https://issues.apache.org/jira/browse/LUCENE-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170182#comment-13170182
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Michael McCandless commented on LUCENE-3648:
--------------------------------------------
This time I ran 20 iters per (total 40).
Deletes:
{noformat}
Task QPS base StdDev base QPS patchStdDev patch Pct
diff
Term 61.01 3.12 58.09 2.73 -13% -
5%
AndHighHigh 14.18 0.73 13.53 0.50 -12% -
4%
Prefix3 54.40 2.36 52.28 2.28 -11% -
4%
IntNRQ 7.82 0.51 7.53 0.43 -14% -
8%
Wildcard 27.19 1.15 26.24 1.07 -11% -
4%
AndHighMed 67.68 3.96 65.42 3.37 -13% -
7%
OrHighMed 12.38 0.68 12.01 0.89 -14% -
10%
OrHighHigh 6.94 0.38 6.73 0.49 -14% -
10%
TermBGroup1M 39.01 1.02 37.91 0.96 -7% -
2%
TermBGroup1M1P 35.65 1.34 34.75 1.08 -8% -
4%
TermGroup1M 31.31 0.69 30.67 0.64 -6% -
2%
SpanNear 3.36 0.13 3.32 0.13 -8% -
6%
Phrase 6.64 0.50 6.56 0.43 -14% -
13%
PKLookup 160.01 5.21 158.48 7.02 -8% -
6%
SloppyPhrase 6.52 0.29 6.49 0.25 -8% -
8%
Fuzzy1 52.51 1.90 52.32 2.79 -8% -
8%
Fuzzy2 41.82 2.28 42.34 2.85 -10% -
14%
Respell 75.82 5.03 77.18 5.76 -11% -
17%
{noformat}
No deletes:
{noformat}
Task QPS base StdDev base QPS patchStdDev patch Pct
diff
Respell 70.35 5.66 69.88 4.87 -14% -
15%
Phrase 2.10 0.13 2.10 0.13 -11% -
13%
Fuzzy2 43.46 3.22 43.51 2.68 -12% -
14%
Prefix3 28.88 2.03 28.94 1.58 -11% -
13%
Wildcard 42.65 2.26 42.80 1.90 -8% -
10%
PKLookup 156.39 6.43 157.10 4.92 -6% -
8%
Fuzzy1 70.51 4.15 71.31 3.16 -8% -
12%
TermBGroup1M1P 12.29 0.67 12.44 0.57 -8% -
11%
TermGroup1M 30.92 1.01 31.30 0.56 -3% -
6%
OrHighMed 17.84 1.17 18.08 0.68 -8% -
12%
IntNRQ 8.05 0.76 8.16 0.69 -15% -
21%
SloppyPhrase 19.02 0.87 19.31 1.01 -7% -
11%
TermBGroup1M 43.87 1.44 44.61 1.00 -3% -
7%
SpanNear 2.38 0.15 2.43 0.15 -9% -
15%
AndHighHigh 15.25 1.06 15.57 0.52 -7% -
13%
AndHighMed 50.55 3.17 51.80 1.77 -6% -
13%
OrHighHigh 5.99 0.40 6.14 0.25 -7% -
14%
Term 95.84 6.18 98.48 4.81 -8% -
15%
{noformat}
> 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, 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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