strace -c -p $(pidof gnome-screensaver) & sleep 10; killall strace
[1] 10627
Process 7452 attached - interrupt to quit

Process 7452 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
   nan    0.000000           0         8           read
   nan    0.000000           0        31           poll
   nan    0.000000           0        18           ioctl
   nan    0.000000           0         2           clock_gettime
------ ----------- ----------- --------- --------- ----------------
100.00    0.000000                    59           total