rmuir commented on code in PR #13381:
URL: https://github.com/apache/lucene/pull/13381#discussion_r1605828738


##########
lucene/core/src/java21/org/apache/lucene/store/MemorySegmentIndexInput.java:
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@@ -57,6 +58,7 @@ abstract class MemorySegmentIndexInput extends IndexInput 
implements RandomAcces
   MemorySegment
       curSegment; // redundant for speed: segments[curSegmentIndex], also 
marker if closed!
   long curPosition; // relative to curSegment, not globally
+  int consecutivePrefetchHitCount;

Review Comment:
   you could also make this a single `AtomicInteger` per mapping and try 
`incrementAndGet()`. I feel like it is worth the discussion, in a multithreaded 
case, any small cost to using this might be drowned in the savings of making 
less system calls overall?



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