I wish to note CPU time taken by a program. What I have done and assume is
as below. Correct me and suggest some solution.
I tried using "time ./a.out" it gave three time and think "user" is
relevent. But I observed this "user time " vary with other load on PC.
Then I tried using following arrangement:
clock_t ct1, ct2;
tms cputime1, cputime2;
ct1 = times(&cputime1) ;
{
// computer code
}
ct2 = times(&cputime2) ;
cout << "\n usertime " <<( cputime2.tms_utime - cputime1.tms_utime
+ cputime2.tms_cutime- cputime1.tms_cutime)/(CLOCKS_PER_SEC/10000.)
This user time, I also find senstive to number of programs running on PC.
My doubts are as:
1) In above "cout" statement should I add difference of "tms_cutime" or
not.
2) Is there any other way ( if this is not the right method ) to note CPU
time taken by some segment of a program, which is independent of load of
PC.
3) Is it so that some variation is normal ( something like least count or
sampling error ), and can not be large enough to cause any seroius
concern. With less load I get time 1.07 sec and when movie is also going
on it gave me 1.21.
Thanks in advance.
H.S.Rai
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