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https://issues.apache.org/jira/browse/LUCENE-10391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17493146#comment-17493146
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Robert Muir commented on LUCENE-10391:
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Actually these nightly benchmarks have not even been running. See LUCENE-10421
> Reuse data structures across HnswGraph invocations
> --------------------------------------------------
>
> Key: LUCENE-10391
> URL: https://issues.apache.org/jira/browse/LUCENE-10391
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Julie Tibshirani
> Priority: Minor
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> Creating HNSW graphs involves doing many repeated calls to HnswGraph#search.
> Profiles from nightly benchmarks suggest that allocating data-structures
> incurs both lots of heap allocations
> ([http://people.apache.org/~mikemccand/lucenebench/2022.01.23.18.03.17.html#profiler_1kb_indexing_vectors_4_heap)]
> and CPU usage
> ([http://people.apache.org/~mikemccand/lucenebench/2022.01.23.18.03.17.html#profiler_1kb_indexing_vectors_4_cpu).]
> It looks like reusing data structures across invocations would be a
> low-hanging fruit that could help save significant CPU?
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