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https://issues.apache.org/jira/browse/LUCENE-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170189#comment-13170189
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Michael McCandless commented on LUCENE-3648:
--------------------------------------------
OK I ran again, with a more modern JVM (Java 1.7.0_01), and the results are
better!
Deletes:
{noformat}
Task QPS base StdDev base QPS patchStdDev patch Pct
diff
Respell 62.87 2.65 61.37 2.86 -10% -
6%
Fuzzy2 56.94 2.00 56.50 2.46 -8% -
7%
Phrase 8.71 0.50 8.67 0.44 -10% -
10%
Fuzzy1 76.38 3.10 76.07 3.20 -8% -
8%
TermGroup1M 35.08 0.55 35.05 0.88 -4% -
4%
SloppyPhrase 11.80 0.57 11.80 0.68 -10% -
11%
AndHighMed 53.93 3.78 54.00 1.92 -9% -
11%
AndHighHigh 16.33 0.72 16.37 0.65 -7% -
9%
TermBGroup1M1P 13.69 0.55 13.76 0.61 -7% -
9%
SpanNear 4.31 0.13 4.35 0.11 -4% -
6%
TermBGroup1M 8.95 0.29 9.10 0.26 -4% -
7%
PKLookup 161.50 5.00 165.99 8.45 -5% -
11%
OrHighMed 16.34 0.44 17.15 0.70 -1% -
12%
Wildcard 25.03 0.09 26.38 1.46 0% -
11%
Term 58.62 2.18 61.85 3.05 -3% -
14%
OrHighHigh 10.87 0.30 11.48 0.46 -1% -
12%
Prefix3 47.57 0.42 50.88 2.93 0% -
14%
IntNRQ 6.92 0.37 7.66 0.85 -6% -
29%
{noformat}
No deletes:
{noformat}
Task QPS base StdDev base QPS patchStdDev patch Pct
diff
Phrase 4.69 0.18 4.52 0.18 -10% -
4%
SloppyPhrase 6.79 0.25 6.62 0.19 -8% -
3%
SpanNear 2.08 0.02 2.05 0.04 -4% -
1%
IntNRQ 9.80 0.36 9.69 1.04 -14% -
13%
TermBGroup1M 42.63 1.09 42.94 2.17 -6% -
8%
Respell 70.38 0.45 71.29 1.66 -1% -
4%
Fuzzy1 64.88 0.61 65.77 2.15 -2% -
5%
AndHighHigh 10.58 0.30 10.74 0.28 -3% -
7%
AndHighMed 71.25 1.58 72.52 1.73 -2% -
6%
Wildcard 24.29 0.38 24.72 0.87 -3% -
7%
Fuzzy2 46.45 0.61 47.29 1.54 -2% -
6%
TermGroup1M 32.16 0.66 32.75 0.72 -2% -
6%
OrHighMed 13.65 0.40 13.96 0.34 -3% -
7%
Prefix3 63.00 1.08 64.41 2.59 -3% -
8%
OrHighHigh 5.22 0.15 5.34 0.13 -3% -
8%
TermBGroup1M1P 52.66 0.61 53.99 1.42 -1% -
6%
PKLookup 159.98 9.36 168.62 4.83 -3% -
15%
Term 67.51 3.42 71.42 3.13 -3% -
16%
{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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