How to remove time spent by hours from the total measured runtime?

Question

I am trying to measure the time taken by a set of statements. Below is the pseudo code. The code is implemented in C ++ on the Xilinx chipset with custom RTOS, so the traditional C ++ clock functions do not work here.

I don't need help with the actual measurement of time, but more with math on how to calculate the actual runtime.

one = clock.getTime();
/*statement 
*     1      *
*     to     *
*     10     */
two = clock.getTime();
fTime = two - one;

Now I know the time spent by the operators. Does this time also include the time spent on getTime () correct too?

one = clock.getTime();
clock.getTime();
two = clock.getTime();
cTime = two - one;     //Just measure and the min value i get is 300 microseconds.

Now this block gives me time spent on getTime ().

Finally my question is:

What is the actual time spent by the operators?

• fTime - cTime
• fTime - (2 * cTime)
• Another equation?

Answer 1

• one = t1 + dt
  two = t2 + dt
  

• ,

  two-one = (t2+dt)-(t1+dt) = t2-t1
  

.

/ ,

• doe -
• ..

, getTime() HW-, T

• - this