spayne

i7-3930K CPU @ 3.20Ghz

interference type: none
             add:     1.91 cycles/op
      add_mfence:    45.98 cycles/op
         lockadd:    20.51 cycles/op
            xadd:    20.71 cycles/op
            swap:    20.71 cycles/op
         cmpxchg:    20.50 cycles/op
 lockadd_unalign:  1469.86 cycles/op