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Weird fluctuation in execution time

4 posts in this topic

#include <iostream>
int rand(int low, int high){return rand () % (high - low + 1) + low;}

const int nDATA=1;

std::array<int, 100> data;
int count[10];

void task0(){++count[0]; std::cout<<"A\n"<<std::endl;}
void task1(){++count[1]; std::cout<<"B\n"<<std::endl;}
void task2(){++count[2]; std::cout<<"C\n"<<std::endl;}
void task3(){++count[3]; std::cout<<"D\n"<<std::endl;}
void task4(){++count[4]; std::cout<<"E\n"<<std::endl;}
void task5(){++count[5]; std::cout<<"F\n"<<std::endl;}
void task6(){++count[6]; std::cout<<"G\n"<<std::endl;}
void task7(){++count[7]; std::cout<<"H\n"<<std::endl;}
void task8(){++count[8]; std::cout<<"I\n"<<std::endl;}
void task9(){++count[9]; std::cout<<"J\n"<<std::endl;}

int main()
	for(int i=0; i<100; ++i)
		data[i]=rand(0, nDATA-1);	//Generate Data

	for(int i=0; i<10; ++i)		//initialize count 

	Timer timer;
	for(int n=1; n<=500; ++n)
		for(int i:data)
			case 0:task0();break;
			case 1:task1();break;
			case 2:task2();break;
			case 3:task3();break;
			case 4:task4();break;
			case 5:task5();break;
			case 6:task6();break;
			case 7:task7();break;
			case 8:task8();break;
			case 9:task9();break;




sometime above code finished in 7 seconds, but sometimes 25 seconds regardless what nDATA is set to.



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Windows, VS2012, /Ox(full op) in release


@Alvaro: does the execution become slower as nDATA is set to larger number?

Edited by lride

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No, it seems to be about constant up to nDATA=10 and then it gets faster because there is less stuff to print.


One comment about your code: The C++ way of expressing a range is by including the beginning and excluding the end. If you had followed that convention in your function `rand', you wouldn't be subtracting 1 from nDATA when you call it and adding it back in inside the function. In other words, things are simpler and you are less likely to have off-by-one errors if you adopt this convention. I highly recommend it.


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