[GitHub] [commons-io] brettlounsbury edited a comment on issue #101: IO-649 - Improve the performance of the contentEquals() methods.

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brettlounsbury edited a comment on issue #101: IO-649 - Improve the performance of the contentEquals() methods.
URL: https://github.com/apache/commons-io/pull/101#issuecomment-578764319
 
 
   Hi @garydgregory,
   
   I don't see any comments from you other than the request for a benchmark. 
   
   I have updated IOUtils to include a test dependency on JMH and and to include a benchmark that shows BufferedInputStream.read() performance compared to InputStream.read(byte[]) performance.  This test creates an 8MB file on disk once before the benchmark is ran and reads it back in.  It then just keeps a running sum of the bytes in the file (and ignores any overflow/underflow) and blackhole's the sum at the end to avoid any compiler optimization.
   
   Results look something like this (Multi-byte reads are about 3.5x faster):
   Benchmark                                                        Mode  Cnt         Score        Error  Units
   SingleByteReadVsMultiByteReadPerformanceTest.testReadMultiBytes  avgt   25   6220618.290 ± 204562.812  ns/op
   SingleByteReadVsMultiByteReadPerformanceTest.testReadSingleByte  avgt   25  21740409.146 ± 711294.924  ns/op
   
   
   

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