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Posted to issues@lucene.apache.org by "Julie Tibshirani (Jira)" <ji...@apache.org> on 2022/02/02 22:35:00 UTC

[jira] [Assigned] (LUCENE-10391) Reuse data structures across HnswGraph invocations

     [ https://issues.apache.org/jira/browse/LUCENE-10391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julie Tibshirani reassigned LUCENE-10391:
-----------------------------------------

    Assignee: Julie Tibshirani

> 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
>
> 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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