Managed C++/CLI

DateTime::Now

kclkl18 wrote:

What is the most efficient way of doing this?

Mark Salsbery
Microsoft MVP - Visual C++

kclkl18 wrote:

What is the most efficient way of doing this?

gajatko wrote:

19 vs 37 msec

Mark Salsbery
Microsoft MVP - Visual C++

const int COUNT = 10000000;
myClass** objects = new myClass*[COUNT];

gajatko wrote:

I got 3582 native and 1612 with /clr

Mark Salsbery
Microsoft MVP - Visual C++

start = clock();
for (int i = 0; i < COUNT; i++) {
    objects[i] = new myClass();
    delete objects[i];
}
printf("Native with delete: %f\n", (double)(clock() - start) / CLOCKS_PER_SEC * 1000);

class myClass
{
};

int _tmain(int argc, _TCHAR* argv[])
{
	const int COUNT = 1000000;
	myClass** objects = new myClass*[COUNT];

	clock_t start1 = clock();
	for (int i = 0; i < COUNT; i++) 
	{
		objects[i] = new myClass();
		delete objects[i];
	}
	clock_t end1 = clock();

	clock_t start2 = clock();
	for (int i = 0; i < COUNT; i++){
		objects[i] = new myClass();
	}
	clock_t end2 = clock();
	clock_t start3 = clock();
	for (int i = 0; i < COUNT; i++){
		delete objects[i];
	}
	clock_t end3 = clock();

	printf("Loop with new/delete: %d\n\n", end1 - start1);
	printf("Loop with new: %d\n", end2 - start2);
	printf("Loop with delete: %d\n", end3 - start3);
	printf("Total of loop new and loop delete: %d\n", end3 - start2);

	printf("\n\nPress enter to end...");
	getchar();

	delete[] objects;

	return 0;
}

Mark Salsbery
Microsoft MVP - Visual C++

Mark Salsbery wrote:

Try this (and do NOT run in the debugger!)

gajatko wrote:

I get used to strange things happening with M$ implementation of Java VM*

Loop with new/delete: 174

Loop with new: 101
Loop with delete: 77
Total of loop new and loop delete: 178


Press enter to end...

Loop with new/delete: 306

Loop with new: 90
Loop with delete: 64
Total of loop new and loop delete: 154


Press enter to end...

Mark Salsbery wrote:

and compiler version?

Mark Salsbery wrote:

I'm not sure what you're expecting here.

Mark Salsbery wrote:

First, if you were running tests in the debugger, forgetaboutit.

Mark Salsbery wrote:

Second, comparing times for two sets of loops isn't going to work.

Mark Salsbery wrote:

the MSIL is better optimized

Mark Salsbery wrote:

Lastly, don't believe people that say managed code is slower

gajatko wrote:

Not sure what to expect, but definately not this

gajatko wrote:

Lucky and happy you.

gajatko wrote:

The problem is that if you believe something (God, Holy Grail, etc.) you likely believe people as well.

Mark Salsbery
Microsoft MVP - Visual C++