gistfile1.txt

with Rubinius.synchronize:

$ ./bin/benchmark core/file/bench_each_byte.rb
=== rbx ===                                                                        
File#each_byte with a small file                                                   
                           29.1 (±0.0%) i/s -        146 in   5.023101s (cycle=2)  
File#each_byte with a medium file                                                  
                            3.3 (±0.0%) i/s -         17 in   5.228034s (cycle=1)  
File#each_byte with a large file                                                   
                            0.3 (±0.0%) i/s -          2 in   6.110730s (cycle=1)  


Without Rubinius.synchronize:

$ ./bin/benchmark core/file/bench_each_byte.rb
=== rbx ===                                                                        
File#each_byte with a small file                                                   
                          187.9 (±2.1%) i/s -        945 in   5.030880s (cycle=15) 
File#each_byte with a medium file                                                  
                           21.0 (±0.0%) i/s -        106 in   5.042086s (cycle=2)  
File#each_byte with a large file                                                   
                            2.1 (±0.0%) i/s -         11 in   5.196253s (cycle=1)