threads:  1 2 4 8 12 16 20 24 32  
MutexRWLock                     1125 36437 39578 38797 38156 36328 35469 35313 34875  
ClassicRWLock                   2016 44453 48610 51938 52219 51657 52297 50937 50515  
Nonblocking_Reader_Lock         1578 37657 40328 39625 38922 38047 37375 37188 36485  
SG_Lock                         1672 36984 38672 39109 38781 37031 36578 36312 35968  
Simple_Lock                     1000 1203 1328 1344 1359 1375 1390 1406 1454  
Shared_Counter_Lock             1188 1531 1672 1734 1766 1765 1782 1797 1843  
BASELINE_Lock                   531 1922 1937 1938 1937 1938 1937 1922 1922  
   Write Only Overhead
MutexRWLock                     594 34515 37641 36859 36219 34390 33532 33391 32953
ClassicRWLock                   1485 42531 46673 50000 50282 49719 50360 49015 48593
Nonblocking_Reader_Lock         1047 35735 38391 37687 36985 36109 35438 35266 34563
SG_Lock                         1141 35062 36735 37171 36844 35093 34641 34390 34046
Simple_Lock                     469 0 0 0 0 0 0 0 0
Shared_Counter_Lock             657 0 0 0 0 0 0 0 0
BASELINE_Lock                   0 0 0 0 0 0 0 0 0