is D so slow?
baleog
maccarka at yahoo.com
Sat Jun 14 11:15:56 PDT 2008
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;
}
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