strace -c -o trace4 tzap "RTP 1"

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 99.19    0.003433          21       166           ioctl
  0.81    0.000028           0        85           write
  0.00    0.000000           0       140           read
  0.00    0.000000           0         6           open
  0.00    0.000000           0         3           close
  0.00    0.000000           0         3           fstat
  0.00    0.000000           0         9           mmap
  0.00    0.000000           0         4           mprotect
  0.00    0.000000           0         1           munmap
  0.00    0.000000           0         3           brk
  0.00    0.000000           0         1           rt_sigaction
  0.00    0.000000           0         4         4 access
  0.00    0.000000           0        27         1 nanosleep
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         1           arch_prctl
------ ----------- ----------- --------- --------- ----------------
100.00    0.003461                   454         5 total