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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12658718#action_12658718
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Michael McCandless commented on LUCENE-1483:
--------------------------------------------
Results with topN=10:
||numSeg||index||sortBy||method||query||topN||hits||warm||qps||warmnew||qpsnew||pctg||
|1|simple|country|val|text|10|2000000| 0.6| 10.7| 0.7| 11.7| 9.3%|
|1|simple|country|ord|text|10|2000000| 0.6| 10.7| 0.6| 13.8| 29.0%|
|1|simple|country|ordval|text|10|2000000| 0.6| 10.7| 0.6| 13.3| 24.3%|
|1|simple|country|orddem|text|10|2000000| 0.6| 10.7| 0.7| 13.0| 21.5%|
|1|wiki|title|val|147|10| 4984| 2.1|3743.8| 2.3|2441.8|-34.8%|
|1|wiki|title|ord|147|10| 4984| 2.1|3743.8| 2.0|4426.2| 18.2%|
|1|wiki|title|ordval|147|10| 4984| 2.1|3743.8| 2.1|4352.7| 16.3%|
|1|wiki|title|orddem|147|10| 4984| 2.1|3743.8| 2.0|4063.6| 8.5%|
|1|wiki|title|val|text|10| 97191| 2.1| 144.2| 2.3| 39.1|-72.9%|
|1|wiki|title|ord|text|10| 97191| 2.1| 144.2| 2.1| 164.5| 14.1%|
|1|wiki|title|ordval|text|10| 97191| 2.1| 144.2| 2.1| 162.6| 12.8%|
|1|wiki|title|orddem|text|10| 97191| 2.1| 144.2| 2.1| 157.3| 9.1%|
|1|wiki|title|val|1|10| 386435| 2.1| 51.2| 2.4| 13.6|-73.4%|
|1|wiki|title|ord|1|10| 386435| 2.1| 51.2| 2.1| 65.7| 28.3%|
|1|wiki|title|ordval|1|10| 386435| 2.1| 51.2| 2.1| 64.7| 26.4%|
|1|wiki|title|orddem|1|10| 386435| 2.1| 51.2| 2.1| 60.4| 18.0%|
||numSeg||index||sortBy||method||query||topN||hits||warm||qps||warmnew||qpsnew||pctg||
|10|simple|country|val|text|10|2000000| 0.7| 10.4| 0.6| 11.6| 11.5%|
|10|simple|country|ord|text|10|2000000| 0.7| 10.4| 0.6| 13.6| 30.8%|
|10|simple|country|ordval|text|10|2000000| 0.7| 10.4| 0.6| 13.1| 26.0%|
|10|simple|country|orddem|text|10|2000000| 0.7| 10.4| 0.6| 13.1| 26.0%|
|10|wiki|title|val|147|10| 4984| 12.5|3004.5| 2.5|1732.9|-42.3%|
|10|wiki|title|ord|147|10| 4984| 12.5|3004.5| 2.1|3067.2| 2.1%|
|10|wiki|title|ordval|147|10| 4984| 12.5|3004.5| 2.1|3283.5| 9.3%|
|10|wiki|title|orddem|147|10| 4984| 12.5|3004.5| 2.1|3237.9| 7.8%|
|10|wiki|title|val|text|10| 97191| 12.7| 139.4| 2.4| 38.6|-72.3%|
|10|wiki|title|ord|text|10| 97191| 12.7| 139.4| 2.1| 159.5| 14.4%|
|10|wiki|title|ordval|text|10| 97191| 12.7| 139.4| 2.1| 160.5| 15.1%|
|10|wiki|title|orddem|text|10| 97191| 12.7| 139.4| 2.1| 154.0| 10.5%|
|10|wiki|title|val|1|10| 386435| 12.7| 50.3| 2.5| 15.6|-69.0%|
|10|wiki|title|ord|1|10| 386435| 12.7| 50.3| 2.1| 64.8| 28.8%|
|10|wiki|title|ordval|1|10| 386435| 12.7| 50.3| 2.1| 64.0| 27.2%|
|10|wiki|title|orddem|1|10| 386435| 12.7| 50.3| 2.1| 59.4| 18.1%|
||numSeg||index||sortBy||method||query||topN||hits||warm||qps||warmnew||qpsnew||pctg||
|100|simple|country|val|text|10|2000000| 1.0| 8.8| 2.8| 9.4| 6.8%|
|100|simple|country|ord|text|10|2000000| 1.0| 8.8| 0.6| 11.1| 26.1%|
|100|simple|country|ordval|text|10|2000000| 1.0| 8.8| 0.6| 10.7| 21.6%|
|100|simple|country|orddem|text|10|2000000| 1.0| 8.8| 0.6| 10.7| 21.6%|
|100|wiki|title|val|147|10| 4984| 94.6|1066.9| 3.3| 454.8|-57.4%|
|100|wiki|title|ord|147|10| 4984| 94.6|1066.9| 2.1| 519.2|-51.3%|
|100|wiki|title|ordval|147|10| 4984| 94.6|1066.9| 2.1| 692.5|-35.1%|
|100|wiki|title|orddem|147|10| 4984| 94.6|1066.9| 2.1| 778.1|-27.1%|
|100|wiki|title|val|text|10| 97191| 94.9| 110.2| 2.7| 38.9|-64.7%|
|100|wiki|title|ord|text|10| 97191| 94.9| 110.2| 2.1| 122.8| 11.4%|
|100|wiki|title|ordval|text|10| 97191| 94.9| 110.2| 2.1| 126.3| 14.6%|
|100|wiki|title|orddem|text|10| 97191| 94.9| 110.2| 2.1| 124.7| 13.2%|
|100|wiki|title|val|1|10| 386435| 94.3| 47.9| 2.8| 15.8|-67.0%|
|100|wiki|title|ord|1|10| 386435| 94.3| 47.9| 2.1| 59.1| 23.4%|
|100|wiki|title|ordval|1|10| 386435| 94.3| 47.9| 2.2| 58.9| 23.0%|
|100|wiki|title|orddem|1|10| 386435| 94.3| 47.9| 2.2| 54.9| 14.6%|
> Change IndexSearcher to use MultiSearcher semantics for multiple subreaders
> ---------------------------------------------------------------------------
>
> Key: LUCENE-1483
> URL: https://issues.apache.org/jira/browse/LUCENE-1483
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.9
> Reporter: Mark Miller
> Priority: Minor
> Attachments: LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch,
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch,
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch,
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch,
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, sortBench.py,
> sortCollate.py
>
>
> FieldCache and Filters are forced down to a single segment reader, allowing
> for individual segment reloading on reopen.
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