is D so slow?
baleog
maccarka at yahoo.com
Sun Jun 15 04:53:30 PDT 2008
Thank you for your replies! I used malloc instead of new and run time was about 1sec
p.s. i'm sorry for my terrible english
Tomas Lindquist Olsen Wrote:
> baleog wrote:
> > Hello
> > I wrote 2 almost identical test programs(matrix multiplication). One on C and another on D. And D prorgram was 15 times slower!
> > Was it my mistake or not?
> > Thank you
> >
> > p.s. code:
> > void test (int n) {
> > float[] xs = new float[n*n];
> > float[] ys = new float[n*n];
> > for(int i = n-1; i>=0; --i) {
> > xs[i] = 1.0;
> > }
> > for(int i = n-1; i>=0; --i) {
> > ys[i] = 2.0;
> > }
> > float[] zs = new float[n*n];
> > for (int i=0; i<n; ++i) {
> > for (int j=0; j<n; ++j) {
> > float s = 0.0;
> > for (int k=0; k<n; ++k) {
> > s = s + (xs[k + (i*n)] * ys[j + (k*n)]);
> > }
> > zs[j+ (i*n)] = s;
> > }
> > }
> > delete xs;
> > delete ys;
> > delete zs;
> > }
> >
>
> What switches did you use to compile? Not much info you're giving ...
>
> Tomas
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