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https://issues.apache.org/jira/browse/LUCENE-2886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990573#comment-12990573
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Robert Muir commented on LUCENE-2886:
-------------------------------------

Here are my performance results, same setup (-server, etc)/index etc as Mike 
except
I'm using windows 64-bit (1.6.0_23/Vista), and I do not have an SSD, just a 
normal hard disk.
Using SimpleFS:
||Query||QPS bulkVint||QPS simple64Varint||Pct diff||||
|+united +states|10.95|10.32|{color:red}-5.8%{color}|
|"united states"~3|3.78|3.67|{color:red}-2.7%{color}|
|"united states"|6.81|6.71|{color:red}-1.5%{color}|
|doctimesecnum:[10000 TO 60000]|8.76|8.81|{color:green}0.5%{color}|
|spanNear([unit, state], 10, true)|22.42|22.92|{color:green}2.3%{color}|
|uni*|13.75|14.22|{color:green}3.4%{color}|
|unit*|24.89|25.86|{color:green}3.9%{color}|
|united~0.75|7.06|7.36|{color:green}4.4%{color}|
|unit~0.7|14.11|14.73|{color:green}4.4%{color}|
|united~0.6|4.34|4.53|{color:green}4.4%{color}|
|unit~0.5|8.16|8.55|{color:green}4.7%{color}|
|states|29.99|31.85|{color:green}6.2%{color}|
|spanFirst(unit, 5)|88.27|93.78|{color:green}6.2%{color}|
|united states|9.97|10.60|{color:green}6.4%{color}|
|doctitle:.*[Uu]nited.*|2.34|2.49|{color:green}6.6%{color}|
|u*d|5.54|6.05|{color:green}9.3%{color}|
|un*d|12.36|13.59|{color:green}9.9%{color}|
|+nebraska +states|47.58|62.53|{color:green}31.4%{color}|

Using MMap:
||Query||QPS bulkVint||QPS simple64Varint||Pct diff||||
|+united +states|13.88|11.95|{color:red}-13.9%{color}|
|spanFirst(unit, 5)|123.50|106.84|{color:red}-13.5%{color}|
|"united states"~3|4.64|4.17|{color:red}-10.1%{color}|
|"united states"|8.90|8.19|{color:red}-8.0%{color}|
|doctimesecnum:[10000 TO 60000]|10.72|9.98|{color:red}-7.0%{color}|
|spanNear([unit, state], 10, true)|33.70|31.63|{color:red}-6.1%{color}|
|uni*|17.26|16.30|{color:red}-5.5%{color}|
|states|37.14|35.40|{color:red}-4.7%{color}|
|unit*|29.96|28.57|{color:red}-4.7%{color}|
|united states|11.52|11.22|{color:red}-2.6%{color}|
|united~0.75|10.87|10.75|{color:red}-1.1%{color}|
|united~0.6|7.69|7.68|{color:red}-0.1%{color}|
|doctitle:.*[Uu]nited.*|3.83|3.91|{color:green}2.2%{color}|
|un*d|16.83|17.26|{color:green}2.6%{color}|
|unit~0.5|16.52|17.05|{color:green}3.2%{color}|
|u*d|8.51|9.08|{color:green}6.7%{color}|
|unit~0.7|26.83|28.93|{color:green}7.8%{color}|
|+nebraska +states|83.69|113.19|{color:green}35.2%{color}|



> Adaptive Frame Of Reference 
> ----------------------------
>
>                 Key: LUCENE-2886
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2886
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Codecs
>            Reporter: Renaud Delbru
>             Fix For: 4.0
>
>         Attachments: LUCENE-2886_simple64.patch, 
> LUCENE-2886_simple64_varint.patch, lucene-afor.tar.gz
>
>
> We could test the implementation of the Adaptive Frame Of Reference [1] on 
> the lucene-4.0 branch.
> I am providing the source code of its implementation. Some work needs to be 
> done, as this implementation is working on the old lucene-1458 branch. 
> I will attach a tarball containing a running version (with tests) of the AFOR 
> implementation, as well as the implementations of PFOR and of Simple64 
> (simple family codec working on 64bits word) that has been used in the 
> experiments in [1].
> [1] http://www.deri.ie/fileadmin/documents/deri-tr-afor.pdf

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