easyice commented on PR #15104:
URL: https://github.com/apache/lucene/pull/15104#issuecomment-3213192975

   I am also seeing performance regression related to #15089 
   
   PR with out #15089 
   ```
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVInt                64  
thrpt    5  7.187 ± 0.588  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVIntBaseline        64  
thrpt    5  4.021 ± 0.181  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readVInt                     64  
thrpt    5  4.858 ± 0.079  ops/us
   ```
   
   PR
   ```
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVInt                64  
thrpt    5  0.366 ± 0.033  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVIntBaseline        64  
thrpt    5  3.998 ± 0.255  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readVInt                     64  
thrpt    5  4.890 ± 0.428  ops/us
   ```
   
   
   Then I tried increasing the warmup time from 3 to 10, but it didn’t help.
   
   PR (warmup time 10)
   ```
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVInt                64  
thrpt    5  0.331 ± 0.045  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVIntBaseline        64  
thrpt    5  4.006 ± 0.113  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readVInt                     64  
thrpt    5  4.912 ± 0.263  ops/us
   ```


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