experimenting strace and node.js

printvar.js

#!/usr/bin/node

var x = 1
console.log("value of x is ", x)

strace_output.txt

value of x is  1
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 23.06    0.000101           1        87           mmap
 20.09    0.000088          22         4           clone
 17.35    0.000076           3        27           munmap
 13.24    0.000058          12         5           futex
  6.39    0.000028           1        35           rt_sigaction
  3.65    0.000016           0        44           mprotect
  2.97    0.000013           1        26         9 ioctl
  2.51    0.000011          11         1           readlink
  1.83    0.000008           0        23           open
  1.83    0.000008           4         2           pipe2
  1.14    0.000005           0        11           brk
  0.91    0.000004           0        23           fstat
  0.91    0.000004           4         1           epoll_create1
  0.68    0.000003           3         1           poll
  0.46    0.000002           0        22           read
  0.46    0.000002           1         3           write
  0.46    0.000002           0        20           close
  0.46    0.000002           0         5           rt_sigprocmask
  0.46    0.000002           1         2           getuid
  0.46    0.000002           2         1           eventfd2
  0.23    0.000001           1         1           geteuid
  0.23    0.000001           1         1           setrlimit
  0.23    0.000001           1         1           clock_getres
  0.00    0.000000           0         1           stat
  0.00    0.000000           0         3           lstat
  0.00    0.000000           0        16        16 access
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         1           getcwd
  0.00    0.000000           0         2           getrlimit
  0.00    0.000000           0         1           getgid
  0.00    0.000000           0         1           getegid
  0.00    0.000000           0         1           arch_prctl
  0.00    0.000000           0         1           set_tid_address
  0.00    0.000000           0         1           set_robust_list
  0.00    0.000000           0         2           dup3
------ ----------- ----------- --------- --------- ----------------
100.00    0.000438                   377        25 total