jpountz commented on PR #13190:
URL: https://github.com/apache/lucene/pull/13190#issuecomment-2011813580

   > Nightly benchy hardwires the maxMergeCount=16, maxThreadCount=12
   
   Do you remember how you came up with these numbers? Is there some reasoning 
behind these numbers, or do they come from experimentation?
   
   I'm also curious if you know where the current `maxThreadCount = max(1, 
min(4, coreCount / 2))` is coming from. Is the `4` number trying to approximate 
the number of tiers of `TieredMergePolicy` (max seg size = 5GB, 500MB, 50MB, 
5MB ~= 2MB = min seg size) in order to allow one merge on each tier to run 
concurrently?


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