easyice commented on PR #12841:
URL: https://github.com/apache/lucene/pull/12841#issuecomment-1871203007

   Yeah, i backport this PR to branch_9x on my local machine, and run the 
benchmark with java11, i got performance regression  for `MMapDirectoryInputs`, 
even if we not change the code for `ByteBufferIndexInput` :(
   
   java11
   ```
   Benchmark                                                            (size)  
 Mode  Cnt  Score   Error   Units
   GroupVIntBenchmark.benchByteBuffersIndexInput_readGroupVInt              64  
thrpt    5  5.064 ± 0.069  ops/us
   GroupVIntBenchmark.benchByteBuffersIndexInput_readGroupVIntBaseline      64  
thrpt    5  1.612 ± 0.078  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVInt                64  
thrpt    5  6.334 ± 0.914  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readGroupVIntBaseline        64  
thrpt    5  7.362 ± 0.505  ops/us
   GroupVIntBenchmark.benchMMapDirectoryInputs_readVInt                     64  
thrpt    5  4.885 ± 0.545  ops/us
   GroupVIntBenchmark.benchNIOFSDirectoryInputs_readGroupVInt               64  
thrpt    5  2.977 ± 0.346  ops/us
   GroupVIntBenchmark.benchNIOFSDirectoryInputs_readGroupVIntBaseline       64  
thrpt    5  2.660 ± 1.700  ops/us
   ```


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