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https://issues.apache.org/jira/browse/LUCENE-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548466#comment-13548466
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Michael McCandless commented on LUCENE-3178:
--------------------------------------------
I haven't looked closely at the patch, but I ran an initial perf test:
{noformat}
Task QPS base StdDev QPS comp StdDev
Pct diff
AndHighLow 1024.41 (3.1%) 856.52 (2.0%)
-16.4% ( -20% - -11%)
LowPhrase 69.04 (1.7%) 58.90 (0.9%)
-14.7% ( -16% - -12%)
AndHighMed 193.16 (1.0%) 169.24 (1.4%)
-12.4% ( -14% - -10%)
Respell 55.65 (3.0%) 50.01 (3.3%)
-10.1% ( -15% - -3%)
Fuzzy2 67.18 (3.3%) 60.52 (3.6%)
-9.9% ( -16% - -3%)
Fuzzy1 68.83 (3.4%) 62.65 (3.4%)
-9.0% ( -15% - -2%)
LowSloppyPhrase 85.35 (1.8%) 78.64 (1.6%)
-7.9% ( -11% - -4%)
LowSpanNear 38.05 (2.9%) 35.14 (3.1%)
-7.6% ( -13% - -1%)
Wildcard 99.78 (3.0%) 93.39 (2.9%)
-6.4% ( -12% - 0%)
MedSpanNear 77.91 (2.2%) 74.26 (2.3%)
-4.7% ( -9% - 0%)
HighSpanNear 9.24 (2.7%) 8.86 (2.5%)
-4.1% ( -9% - 1%)
HighSloppyPhrase 2.25 (4.0%) 2.16 (3.8%)
-4.0% ( -11% - 3%)
MedSloppyPhrase 78.44 (2.2%) 75.35 (2.4%)
-3.9% ( -8% - 0%)
HighPhrase 30.39 (8.1%) 29.27 (7.9%)
-3.7% ( -18% - 13%)
LowTerm 808.93 (5.0%) 779.29 (5.4%)
-3.7% ( -13% - 7%)
MedPhrase 176.20 (5.9%) 169.98 (5.5%)
-3.5% ( -14% - 8%)
Prefix3 51.16 (6.0%) 49.53 (4.9%)
-3.2% ( -13% - 8%)
AndHighHigh 69.32 (2.3%) 67.21 (2.4%)
-3.0% ( -7% - 1%)
IntNRQ 10.99 (10.0%) 10.86 (9.0%)
-1.2% ( -18% - 19%)
MedTerm 329.36 (10.0%) 325.83 (11.9%)
-1.1% ( -20% - 23%)
OrHighMed 67.18 (2.2%) 66.64 (4.5%)
-0.8% ( -7% - 6%)
OrHighHigh 42.91 (2.5%) 42.59 (4.8%)
-0.7% ( -7% - 6%)
OrHighLow 62.96 (2.3%) 62.58 (4.9%)
-0.6% ( -7% - 6%)
HighTerm 120.76 (11.6%) 121.21 (14.9%)
0.4% ( -23% - 30%)
{noformat}
This is a "hot" test, with 10M no-stopwords English Wikipedia. Baseline is
normal MMapDir and comp is NativePosixMMapDirectory. Not sure why some queries
are slower ...
> Native MMapDir
> --------------
>
> Key: LUCENE-3178
> URL: https://issues.apache.org/jira/browse/LUCENE-3178
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
> Labels: gsoc2012, lucene-gsoc-12
> Attachments: LUCENE-3178-Native-MMap-implementation.patch,
> LUCENE-3178-Native-MMap-implementation.patch,
> LUCENE-3178-Native-MMap-implementation.patch
>
>
> Spinoff from LUCENE-2793.
> Just like we will create native Dir impl (UnixDirectory) to pass the right OS
> level IO flags depending on the IOContext, we could in theory do something
> similar with MMapDir.
> The problem is MMap is apparently quite hairy... and to pass the flags the
> native code would need to invoke mmap (I think?), unlike UnixDir where the
> code "only" has to open the file handle.
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