% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 96.80    2.013028          23     86221       881 futex
  3.20    0.066533         109       607           madvise
------ ----------- ----------- --------- --------- ----------------
100.00    2.079561          23     86828       881 total