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https://issues.apache.org/jira/browse/LUCENE-2886?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2886:
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Attachment: LUCENE-2886_simple64.patch
I pulled out the simple64 implementation here and adapted it to the
bulkpostings branch.
Thanks for uploading this code Renaud, its great and the code is easy to work
with. I hope to get some more of the codecs you wrote into the branch for
testing.
I changed a few things that helped in benchmarking:
* the decoder uses relative gets instead of absolute
* we write #longs in the block header instead of #bytes (as its always long
aligned, but smaller numbers)
But mainly, for this one I think we should change it to be a VariableIntBlock
codec... right now it packs 128 integers into as few longs as possible, but
this is wasteful for two reasons: it has to write a per-block byte header, and
also wastes bits (e.g. in the case of a block of 128 1's).
With variableintblock, we could do this differently, e.g. read a fixed number
of longs per-block (say 4 longs), and our block would then be variable between
4 and 240 integers depending upon data.
> 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-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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