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https://issues.apache.org/jira/browse/LUCENE-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564880#comment-13564880
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Greg Bowyer commented on LUCENE-3178:
-------------------------------------
So I was going to shut this down today, and just to make sure I ran the
benchmark on the simplest code possible
... and suddenly I got good results, this is idiopathic :S
https://gist.github.com/0f017853861d050c0b66
{code}
Report after iter 19:
TaskQPS baseline StdDevQPS mmap_tests StdDev
Pct diff
OrHighHigh 1.68 (11.2%) 1.73 (10.3%)
3.0% ( -16% - 27%)
PKLookup 129.89 (5.8%) 135.03 (6.0%)
4.0% ( -7% - 16%)
HighTerm 8.09 (13.6%) 8.43 (12.8%)
4.2% ( -19% - 35%)
OrHighMed 4.46 (10.4%) 4.67 (9.5%)
4.7% ( -13% - 27%)
OrHighLow 4.82 (10.6%) 5.09 (10.3%)
5.6% ( -13% - 29%)
HighSpanNear 0.92 (8.1%) 0.97 (7.3%)
5.9% ( -8% - 23%)
IntNRQ 2.51 (10.2%) 2.67 (9.9%)
6.6% ( -12% - 29%)
HighPhrase 0.30 (11.7%) 0.32 (12.8%)
6.7% ( -16% - 35%)
MedPhrase 2.93 (6.8%) 3.12 (8.2%)
6.7% ( -7% - 23%)
AndHighHigh 5.46 (6.6%) 5.86 (7.0%)
7.2% ( -5% - 22%)
Respell 19.68 (5.9%) 21.15 (6.6%)
7.5% ( -4% - 21%)
LowPhrase 0.46 (9.5%) 0.50 (10.2%)
7.6% ( -11% - 30%)
Prefix3 5.25 (8.2%) 5.66 (7.7%)
7.9% ( -7% - 25%)
HighSloppyPhrase 1.54 (8.0%) 1.67 (13.1%)
8.5% ( -11% - 32%)
MedSpanNear 5.25 (7.0%) 5.72 (8.2%)
9.0% ( -5% - 25%)
Wildcard 12.44 (5.7%) 13.59 (6.5%)
9.2% ( -2% - 22%)
MedSloppyPhrase 2.27 (7.2%) 2.49 (8.5%)
9.5% ( -5% - 27%)
MedTerm 28.16 (10.3%) 30.89 (9.9%)
9.7% ( -9% - 33%)
Fuzzy1 18.91 (6.0%) 20.82 (6.7%)
10.1% ( -2% - 24%)
Fuzzy2 19.69 (6.6%) 21.68 (7.5%)
10.1% ( -3% - 25%)
AndHighMed 7.79 (7.5%) 8.58 (6.1%)
10.1% ( -3% - 25%)
LowSpanNear 1.45 (5.7%) 1.60 (9.3%)
10.5% ( -4% - 27%)
LowSloppyPhrase 22.84 (7.7%) 25.45 (9.7%)
11.4% ( -5% - 31%)
LowTerm 46.46 (6.8%) 52.90 (7.6%)
13.9% ( 0% - 30%)
AndHighLow 35.92 (5.3%) 42.38 (7.1%)
18.0% ( 5% - 32%)
{code}
> 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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