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https://issues.apache.org/jira/browse/LUCENE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1410:
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Attachment: TestPFor2.java
Attached new TestPfor2.java:
- If you run it on _x.frq, it will split that into _x.frq.frq and
_x.frq.doc so we can separately test frq vs docs
- Added checksum.
- Added zeroing of reused IntBuffer before calling PFor.compress
(seems to be necessary? Else I trip an assert inside PFor).
Paul, indeed I get a different checksum for vint vs pfor decoding.
I think the bug is somewhere in pfor, I'm guessing in the exception
logic, because the difference I see is suddenly pfor returns 0 when it
should have returned a large int relative to the other ints nearby.
Maybe this is why exception processing looked so much faster :)
I'll hold off posting more perf results until we can resolve that.
To see the checksum run it with asserts, eg like this:
java -ea oal.util.pfor.TestPFor2 /path/to/index _x.prx
It then prints out SUM lines after each iteration.
If you set DEBUG = true, it'll print the first 1000 values and then
search for "v=0".
> PFOR implementation
> -------------------
>
> Key: LUCENE-1410
> URL: https://issues.apache.org/jira/browse/LUCENE-1410
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Other
> Reporter: Paul Elschot
> Priority: Minor
> Attachments: LUCENE-1410b.patch, TestPFor2.java, TestPFor2.java,
> TestPFor2.java
>
> Original Estimate: 21840h
> Remaining Estimate: 21840h
>
> Implementation of Patched Frame of Reference.
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