strace
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strace[1] is a diagnostic, debugging and instructional userspace utility for Linux that allows to trace system calls and signals.
strace -c -f -p $PID .../... % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 63.56 0.032899 539 61 13 futex 17.62 0.009118 217 42 epoll_pwait 11.48 0.005944 104 57 nanosleep 3.15 0.001628 11 142 madvise 1.07 0.000553 79 7 read 0.87 0.000452 64 7 write 0.72 0.000374 374 1 1 restart_syscall 0.59 0.000307 51 6 sched_yield 0.56 0.000291 145 2 getpid 0.36 0.000184 92 2 rt_sigreturn 0.01 0.000007 3 2 tgkill ------ ----------- ----------- --------- --------- ---------------- 100.00 0.051757 329 14 total
Examples
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