sgup432 commented on issue #14999:
URL: https://github.com/apache/lucene/issues/14999#issuecomment-3130370732
I had used `async-profiler` for this, had taken multiple such profiles. I
had only attached a partial screenshot here, so my bad!
And I am certainly curious to know which are the tools which generate
"ghosts profiles"!
Had used arthas tool as well to further trace
`org.apache.lucene.index.IndexReader registerParentReader` and filter out
requests taking > 30ms, there were a bunch of them, mostly around ranging
between 40-50ms. 100ms was the max I saw when profiling for a minute or so. I
don't have an accurate p99 for this.
Index shard in question was around ~650mb in size with each having ~20
segments.
>If this map was truly the bottleneck from all the entries coming and going,
I'd expect to see stuff such as java.util.WeakHashmap.expungeStaleEntries() in
your profile, which leads me to believe it is a profiler ghost.
This is one of the another profiler snapshot I have, probably more
descriptive than the one above.
<img width="1068" height="1053" alt="Image"
src="https://github.com/user-attachments/assets/493156bf-ac50-4e40-9de2-f5b306a6c616";
/>
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