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https://issues.apache.org/jira/browse/LUCENE-5554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13949484#comment-13949484
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Michael McCandless commented on LUCENE-5554:
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bq. I am also unsure if the current "performance degradation" is real at all.
Its a benchmark and the methods in question are compiled with OSR. It seems
like it may just be a benchmark issue.
We should improve the luceneutil benchmark if we can, but just because hotspot
chose to use OSR doesn't mean the benchmark is a microbenchmark (the reverse is
often true I guess).
The benchmark takes a large task file (many different queries in each of the
categories), randomly picks one query per category, executes each query 100
times, but shuffles the order that all these queries will run, and runs with 3
threads.
I think there are clear improvements we could make, e.g. using "real world"
queries (these queries were generated by walking the index to find "good"/hard
queries; the source for that is CreateQueries.java in luceneutil), also do
faceting/grouping/joining/sort by field/highlighting as well, etc. Basically
make it closer to a real search app ...
But net/net I don't think this is a microbenchmark; I think it's a fair test.
Please don't shoot the messenger :)
If anyone else has different benchmarks to try, please do so! Even just
running luceneutil on your env is great because maybe my env has some strange
behavior or something...
> Add TermBulkScorer
> ------------------
>
> Key: LUCENE-5554
> URL: https://issues.apache.org/jira/browse/LUCENE-5554
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.8, 5.0
>
> Attachments: LUCENE-5554.patch, LUCENE-5554.patch
>
>
> Hotspot was unhappy with the changes in LUCENE-5487, e.g.:
> http://people.apache.org/~mikemccand/lucenebench/OrHighHigh.html
> But it looks like we can get the performance back by making a dedicated
> BulkScorer for TermQuery.
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