I run the following simple test, compiled with
g++ test.cc -o test
and I got the following results.
I see a 4-fold speed reduction using STL.
What am I doing wrong?
Achilleas
---------------------------
$ time ./test 10000 1
real 0m0.121s
user 0m0.120s
sys 0m0.001s
while
$ time ./test 10000 2
real 0m0.462s
user 0m0.459s
sys 0m0.003s
and
$ time ./test 100000 1
real 0m1.185s
user 0m1.184s
sys 0m0.001s
while
$ time ./test 100000 2
real 0m4.597s
user 0m4.595s
sys 0m0.002s
--------------------------
test.cc=================================
#include<vector>
int main(int ac,char **av) {
const int M = 1000;
std::vector<int> y(M);
int *x;
x=(int*)malloc(M*sizeof(int));
int N=atoi(av[1]);
if(atoi(av[2])==1) {
for (int i=0;i<N;i++)
for(int j=0;j<M;j++)
x[j]=i/(j+1);
} else if(atoi(av[2])==2) {
for (int i=0;i<N;i++)
for(int j=0;j<M;j++)
y[j]=i/(j+1);
}
}
==================================
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