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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3892) Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, Simple9/16/64, etc.)
Date Fri, 10 Aug 2012 12:14:29 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432716#comment-13432716
] 

Adrien Grand commented on LUCENE-3892:
--------------------------------------

I ran the comparison between acceptableOverheadRatio=PackedInts.COMPACT (0%) and PackedInts.DEFAULT
(20%) and it seems to be much faster with PackedInts.COMPACT:

{noformat}
base=COMPACT, challenger=DEFAULT
                Task    QPS base StdDev base     QPS def  StdDev def      Pct diff
              IntNRQ       81.83        5.43       74.14        2.94  -18% -    0%
            HighTerm      146.55       10.34      133.57        9.02  -20% -    4%
           LowPhrase       93.91        1.63       86.90        1.67  -10% -   -4%
             MedTerm      824.58       43.48      766.35       38.78  -16% -    3%
     LowSloppyPhrase       83.29        1.99       77.65        1.18  -10% -   -3%
           OrHighMed       94.15        5.28       88.34        4.54  -15% -    4%
          OrHighHigh      100.63        5.42       94.57        4.20  -14% -    3%
           OrHighLow      128.62        7.21      120.92        6.07  -15% -    4%
          HighPhrase       13.05        0.45       12.29        0.39  -11% -    0%
             Prefix3      217.06        6.82      205.05        4.62  -10% -    0%
           MedPhrase       27.50        0.97       26.33        0.79  -10% -    2%
            Wildcard      183.20        4.87      175.58        3.89   -8% -    0%
             LowTerm     1763.31       43.24     1693.31       39.29   -8% -    0%
    HighSloppyPhrase       10.05        0.48        9.67        0.40  -11% -    5%
         AndHighHigh      111.59        1.15      107.45        1.66   -6% -   -1%
         LowSpanNear       56.16        1.32       54.25        1.01   -7% -    0%
          AndHighMed      423.44        7.40      409.32        5.10   -6% -    0%
         MedSpanNear       33.14        0.91       32.32        0.74   -7% -    2%
          AndHighLow     2177.50       30.79     2134.05       28.64   -4% -    0%
              Fuzzy1       95.34        2.41       93.66        2.32   -6% -    3%
        HighSpanNear        5.28        0.17        5.21        0.11   -6% -    3%
     MedSloppyPhrase       18.41        0.72       18.19        0.70   -8% -    6%
              Fuzzy2       37.73        1.31       37.31        1.14   -7% -    5%
             Respell      109.71        3.09      108.64        2.76   -6% -    4%
            PKLookup      257.32        6.64      260.00        7.15   -4% -    6%
{noformat}
                
> Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, Simple9/16/64, etc.)
> -------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3892
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3892
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>              Labels: gsoc2012, lucene-gsoc-12
>             Fix For: 4.1
>
>         Attachments: LUCENE-3892-BlockTermScorer.patch, LUCENE-3892-blockFor&hardcode(base).patch,
LUCENE-3892-blockFor&packedecoder(comp).patch, LUCENE-3892-blockFor-with-packedints-decoder.patch,
LUCENE-3892-blockFor-with-packedints-decoder.patch, LUCENE-3892-blockFor-with-packedints.patch,
LUCENE-3892-blockpfor.patch, LUCENE-3892-bulkVInt.patch, LUCENE-3892-direct-IntBuffer.patch,
LUCENE-3892-for&pfor-with-javadoc.patch, LUCENE-3892-handle_open_files.patch, LUCENE-3892-non-specialized.patch,
LUCENE-3892-pfor-compress-iterate-numbits.patch, LUCENE-3892-pfor-compress-slow-estimate.patch,
LUCENE-3892_for_byte[].patch, LUCENE-3892_for_int[].patch, LUCENE-3892_for_unfold_method.patch,
LUCENE-3892_pfor_unfold_method.patch, LUCENE-3892_pulsing_support.patch, LUCENE-3892_settings.patch,
LUCENE-3892_settings.patch
>
>
> On the flex branch we explored a number of possible intblock
> encodings, but for whatever reason never brought them to completion.
> There are still a number of issues opened with patches in different
> states.
> Initial results (based on prototype) were excellent (see
> http://blog.mikemccandless.com/2010/08/lucene-performance-with-pfordelta-codec.html
> ).
> I think this would make a good GSoC project.

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