function time

Applications Programming
1

Hello

I have problem with function 'time' to test my program for file copying .
How to run the function in my source code ?

I try something like that:

system("time"); < -- but this don't working

2

You should try with API "times".
%man 2 times

Best regards,
Iliyan Varshilov

3

From the command line:

time mycopyprog arg1 arg2
real    0m0.03s
user    0m0.01s
sys     0m0.03s

reports the wall clock time, and time in kernel and user mode.

Use a profiler

cc -p -g mycopyprog.c -o mycopyprog
mycopyprog arg1 arg2
prof mycopyprog
... lines of output

-- with gcc use the same options, but use grpof instead of prof

Or: call gettimeofday before the copy function is called, and then call it again after.
Subtract the two timeval structs to get the time.
man gettimeofday