jpountz commented on issue #11592:
URL: https://github.com/apache/lucene/issues/11592#issuecomment-1259677572

   Updated numbers now that TMP no longer runs quadratic merges, and 
BEST_COMPRESSION:
   
   |Dirtiness|Indexing time (msec)|
   |-|-|
   |0%|27219|
   |1%|26897|
   |5%|27196|
   |20%|27043|
   |33%|26188|
   |50%|24729|
   |75%|20993|
   |100%|9971|
   
   So the tolerable dirtiness doesn't affect indexing time too much unless 
unlimited (100%). My understanding is that because we merge 10 segments at 
once, an optimized merge typically increases dirtiness by 10x, so you need to 
bump the tolerable dirtiness very significantly to start seeing benefits. This 
benchmark suggests we wouldn't get very significant benefits from raising the 
maximum tolerable dirtiness.


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