calculating the time

[old rock]

What is the difference between calling omp_get_wtime() and creating it inside the function?

void the_4_square(Pixel* rgbConversion, double laser_time1) { 
    int a = CAM_WIDTH;  
    int b = CAM_HEIGHT; 
    int out = 315;
    Pixel find_red;
    for (int y = 0; y < CAM_HEIGHT; y++){
        for (int x = 0; x < CAM_WIDTH; x++){
            find_red = rgbConversion[(y * CAM_WIDTH) + x];
            if (((a - x + 117) < out) && (a - y - 110) > out) {
                if (find_red.B == 255) {
                    //printf("top right\n");
                    double dors = (omp_get_wtime() - laser_time1) * 1000;
                    printf("borisdfgng of test: %5.2fms\n", dors);
                }
            }else{
                gatering_of_function(rgbConversion, x, y);
            }
        }
    }
}

[crimson whale]

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[keen relic]

What do you mean exactly? Are you asking whether you can just call omp_get_wtime() once outside of the nested for-loops, cause if so, I think the answer is yes, and that it might drastically increase performance.

[old rock]

when i call it omp_get_wtime outside the function. I get better time then i call it inside the function

[keen relic]

Okay, but what is your actual question then?

[old rock]

why do i get better time. when i call it outside the function.

[keen relic]

I don't know what you mean by "better"

[old rock]

i got faster time.

[keen relic]

You have to give more exact details, cause your answers aren't clear

[old rock]

i get between 0 to 5. When i call it outside the funtion. when i inluding the time inside the funtion i get between 300 to 500.

[keen relic]

Okay, and what does the number represent? Seconds? Milliseconds?

And why is one better than the other to you?

[old rock]

Milliseconds.

[old rock]

i do not know. that why i am asking

[keen relic]

Well, why are you trying to get the time? What is the purpose?

[old rock]

i need to find konstant time of the laser. that why

the code works as it should

i have a thory in mine head. i am just wondering if the thory is correct or false

[keen relic]

Tell me your theory

[old rock]

the theory is that. When time is inside the funtion is calulating everything and when it is outside. It just calulating the if statment.

[keen relic]

So the answer is that omp_get_wtime() gives you the current time, so when you call it before the function, you get the time it was before you called the function.

And when you call omp_get_wtime() repeatedly during the for-loop in the function, you get the time it was while the program was still busy executing the function.

So think of omp_get_wtime() as telling you what the time of your clock is: the time might be 5:00 PM before you called the_4_square, and the time might be 5:02 PM after the the_4_square() has finished.

And so this is how you're supposed to use it, according to the documentation:
https://www.openmp.org/spec-html/5.0/openmpsu160.html

[old rock]

Thank you

!solved