$ strace -c ls
file1  file2
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
100.00    0.000017           1        18           mprotect
  0.00    0.000000           0         8           read
  0.00    0.000000           0         1           write
  0.00    0.000000           0        10           open
  0.00    0.000000           0        13           close
  0.00    0.000000           0         1           stat
  0.00    0.000000           0        11           fstat
  0.00    0.000000           0        27           mmap
  0.00    0.000000           0         2           munmap
  0.00    0.000000           0         3           brk
  0.00    0.000000           0         2           rt_sigaction
  0.00    0.000000           0         1           rt_sigprocmask
  0.00    0.000000           0         2           ioctl
  0.00    0.000000           0         1         1 access
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         2           getdents
  0.00    0.000000           0         1           getrlimit
  0.00    0.000000           0         2           statfs
  0.00    0.000000           0         1           arch_prctl
  0.00    0.000000           0         1           set_tid_address
  0.00    0.000000           0         1           openat
  0.00    0.000000           0         1           set_robust_list
------ ----------- ----------- --------- --------- ----------------
100.00    0.000017                   110         1 total

$ ltrace -c ls
file1  file2
% time     seconds  usecs/call     calls      function
------ ----------- ----------- --------- --------------------
 11.42    0.001012          84        12 __ctype_get_mb_cur_max
 11.24    0.000996         124         8 getenv
 10.54    0.000934          93        10 __errno_location
  9.96    0.000883          98         9 malloc
  6.03    0.000534         106         5 memcpy
  5.99    0.000531         106         5 readdir
  4.60    0.000408         408         1 setlocale
  3.77    0.000334          83         4 free
  3.70    0.000328          82         4 __freading
  3.26    0.000289          96         3 __overflow
  2.95    0.000261          87         3 strlen
  2.66    0.000236         118         2 fclose
  2.46    0.000218         109         2 fwrite_unlocked
  2.05    0.000182         182         1 strrchr
  1.90    0.000168          84         2 __fpending
  1.87    0.000166          83         2 fflush
  1.87    0.000166          83         2 fileno
  1.52    0.000135         135         1 isatty
  1.43    0.000127         127         1 getopt_long
  1.41    0.000125         125         1 ioctl
  1.35    0.000120         120         1 textdomain
  1.35    0.000120         120         1 bindtextdomain
  1.29    0.000114         114         1 opendir
  1.22    0.000108         108         1 closedir
  1.21    0.000107         107         1 __cxa_atexit
  1.05    0.000093          93         1 strcoll
  0.95    0.000084          84         1 realloc
  0.94    0.000083          83         1 _setjmp
------ ----------- ----------- --------- --------------------
100.00    0.008862                    86 total