[GitHub] [lucene] jdconrad commented on pull request #11906: Add monster test for many knn docs

[GitBox <gi...@apache.org>]

jdconrad commented on PR #11906:
URL: https://github.com/apache/lucene/pull/11906#issuecomment-1308006136

   Just as confirmation I'm seeing `FixedBitSet.clear` taking up a lot of time as well when running this test.
   
   ```
   "Lucene Merge Thread #0" #18 daemon prio=5 os_prio=0 cpu=347309.85ms elapsed=348.16s tid=0x00007f8ab81121e0 nid=41015 runnable  [0x00007f8adbafb000]
      java.lang.Thread.State: RUNNABLE
   	at org.apache.lucene.util.FixedBitSet.clear(FixedBitSet.java:556)
   	at org.apache.lucene.util.hnsw.HnswGraphSearcher.prepareScratchState(HnswGraphSearcher.java:287)
   	at org.apache.lucene.util.hnsw.HnswGraphSearcher.searchLevel(HnswGraphSearcher.java:211)
   	at org.apache.lucene.util.hnsw.HnswGraphSearcher.searchLevel(HnswGraphSearcher.java:196)
   	at org.apache.lucene.util.hnsw.HnswGraphBuilder.addGraphNode(HnswGraphBuilder.java:186)
   	at org.apache.lucene.util.hnsw.HnswGraphBuilder.addGraphNode(HnswGraphBuilder.java:194)
   	at org.apache.lucene.util.hnsw.HnswGraphBuilder.addVectors(HnswGraphBuilder.java:151)
   	at org.apache.lucene.util.hnsw.HnswGraphBuilder.build(HnswGraphBuilder.java:143)
   	at org.apache.lucene.codecs.lucene94.Lucene94HnswVectorsWriter.mergeOneField(Lucene94HnswVectorsWriter.java:424)
   	at org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat$FieldsWriter.mergeOneField(PerFieldKnnVectorsFormat.java:118)
   	at org.apache.lucene.codecs.KnnVectorsWriter.merge(KnnVectorsWriter.java:80)
   	at org.apache.lucene.index.SegmentMerger.mergeVectorValues(SegmentMerger.java:255)
   	at org.apache.lucene.index.SegmentMerger$$Lambda$185/0x0000000800dc58a8.merge(Unknown Source)
   	at org.apache.lucene.index.SegmentMerger.mergeWithLogging(SegmentMerger.java:298)
   	at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:149)
   	at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:5139)
   	at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4679)
   	at org.apache.lucene.index.IndexWriter$IndexWriterMergeSource.merge(IndexWriter.java:6428)
   	at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:639)
   	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:700)
   ```


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