Adrien Grand created LUCENE-10391:
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Summary: 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
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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