[Insight-users] Fast large matrix add

[zlf]

Hi
I have two 4000x3000 matrics. Say matrix A and matrix C. I want to add the
two matrics. It tooks me 20ms now.

But in my application. I need it finished in 2ms!

Moreover, I cannot put the calculation in GPU because the data translation
between memory and GPU is time-costuming.

Anyway to accerlate the calculation in CPU?

#include "stdafx.h"
#include <iostream>
#include <time.h>
#include <conio.h>

int _tmain(int argc, _TCHAR* argv[])
{
	short* a = new short[4000*3000];
	short* b = new short[4000*3000];
	short* c = new short[4000*3000];

	clock_t cstart, cend;
	double spend;
	cstart = clock();

	for(int i = 0 ; i < 1000;++i){
		#pragma omp parallel for
		for(int x = 0 ; x < 4000*3000;++x){
			//for(int y = 0 ; y < 3000;++y){
			short value = a[x] * 3000 + b[x];
			c[x] = value;
			//}
		}
	}

	cend = clock();
	spend = ((double)(cend-cstart)) / (double)CLOCKS_PER_SEC*1000/1000;
	printf("spend: %f\n(ms)", spend);

	return 0;
}

Thanks

Jerry

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