On Mon, 29 Oct 2001, archan wrote:
> longback, I had written a CPU benchmark program. From that, followign
> >ct2 = times(&cputime2) ;
> >cout << "\n usertime " <<( cputime2.tms_utime - cputime1.tms_utime
> > + cputime2.tms_cutime- cputime1.tms_cutime)/(CLOCKS_PER_SEC/10000.)
> >
Your code do exactly the same thing as mine. I could not understant
tms_cutime's role. Should I add it to tms_utime or not. The relevant
portion of man 2 times and man time are appended. "time" function uses
times function and report results by adding these two.
My doubts were 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.
....................... man 2 times.............
NAME
times - get process times
The tms_utime field contains the CPU time spent executing
instructions of the calling process. The tms_stime field
contains the CPU time spent in the system while executing
tasks on behalf of the calling process. The tms_cutime
field contains the sum of the tms_utime and tms_cutime
values for all waited-for terminated children. The
................. man time ..........
TIME(1) TIME(1)
NAME
time - time a simple command or give resource usage
the user CPU time (the sum of the tms_utime and tms_cutime
values in a struct tms as returned by times(2)), and (iii)
Thanks in advance.
H.S.Rai
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