mikemccand commented on issue #15079: URL: https://github.com/apache/lucene/issues/15079#issuecomment-3196469034
The 08/06 run with the huge slowdown shows this odd stack frame in [the allocation profile](https://benchmarks.mikemccandless.com/2025.08.06.18.04.40.html#profiler_1kb_indexing_vectors_12_heap): ``` 3.04% 5193M java.lang.invoke.DirectMethodHandle#allocateInstance() [Inlined code] at java.lang.invoke.DirectMethodHandle$Holder#newInvokeSpecial() [Inlined code] at java.lang.invoke.Invokers$Holder#linkToTargetMethod() [Inlined code] at org.apache.lucene.store.MemorySegmentIndexInput#readGroupVInt() [Inlined code] at org.apache.lucene.util.GroupVIntUtil#readGroupVInts() [Inlined code] at org.apache.lucene.codecs.lucene99.Lucene99HnswVectorsReader$OffHeapHnswGraph#seek() [JIT compiled code] at org.apache.lucene.util.hnsw.UpdateGraphsUtils#computeJoinSet() [JIT compiled code] at org.apache.lucene.util.hnsw.MergingHnswGraphBuilder#updateGraph() [JIT compiled code] at org.apache.lucene.util.hnsw.MergingHnswGraphBuilder#build() [Interpreted code] at org.apache.lucene.util.hnsw.IncrementalHnswGraphMerger#merge() [Interpreted code] at org.apache.lucene.codecs.lucene99.Lucene99HnswVectorsWriter#mergeOneField() [Interpreted code] at org.apache.lucene.codecs.perfield.PerFieldKnnVectorsFormat$FieldsWriter#mergeOneField() [Interpreted code] ``` What is this `Holder#linkToTargetMethod()` and `DirectMethodHandle$Holder#newInvokeSpecial` under `readGroupVInts`? Why are we allocating method handles when invoking this low level method ... -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
