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https://issues.apache.org/jira/browse/LUCENE-4225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416049#comment-13416049
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Robert Muir commented on LUCENE-4225:
-------------------------------------
{quote}
Looks like some small gain over BulkVInt but not much...
{quote}
Well, thats good enough to see which one is faster. Now lets nuke the
abstraction and just
make this FORPostingsFormat that uses PackedInts?
I think its finally clear that its the abstractions here in the codec, not in
the search API, that
are slowing down bulk decompression :)
> New FixedPostingsFormat for less overhead than SepPostingsFormat
> ----------------------------------------------------------------
>
> Key: LUCENE-4225
> URL: https://issues.apache.org/jira/browse/LUCENE-4225
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-4225.patch
>
>
> I've worked out the start at a new postings format that should have
> less overhead for fixed-int[] encoders (For,PFor)... using ideas from
> the old bulk branch, and new ideas from Robert.
> It's only a start: there's no payloads support yet, and I haven't run
> Lucene's tests with it, except for one new test I added that tries to
> be a thorough PostingsFormat tester (to make it easier to create new
> postings formats). It does pass luceneutil's performance test, so
> it's at least able to run those queries correctly...
> Like Lucene40, it uses two files (though once we add payloads it may
> be 3). The .doc file interleaves doc delta and freq blocks, and .pos
> has position delta blocks. Unlike sep, blocks are NOT shared across
> terms; instead, it uses block encoding if there are enough ints to
> encode, else the same Lucene40 vInt format. This means low-freq terms
> (< 128 = current default block size) are always vInts, and high-freq
> terms will have some number of blocks, with a vInt final block.
> Skip points are only recorded at block starts.
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