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https://issues.apache.org/jira/browse/LUCENE-10142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423594#comment-17423594
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ASF subversion and git services commented on LUCENE-10142:
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Commit b4fcdd9770ef1abcac1287c0751b56ada6dde75a in lucene's branch
refs/heads/main from Robert Muir
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=b4fcdd9 ]
LUCENE-10142: use a better RNG for HNSW vectors
This code makes extensive use of Random, but uses the old legacy
java.util.Random, which is slow. Swap in SplittableRandom for better
performance.
> use a better RNG for Hnsw vectors
> ---------------------------------
>
> Key: LUCENE-10142
> URL: https://issues.apache.org/jira/browse/LUCENE-10142
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-10142.patch
>
>
> When profiling indexing with vectors at
> http://people.apache.org/~mikemccand/lucenebench/, I see a fair amount of
> time spent in java.util.Random.
> {noformat}
> PERCENT CPU SAMPLES STACK
> ...
> 7.30% 305461 java.util.Random#nextInt()
> {noformat}
> We don't need its thread-safety guarantees (CAS loop etc).
> We can use SplittableRandom as a drop-in replacement.
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