matlab VS. fortran, matlab win?

[alsoran]

I dont believe that :

fortran codes costs 1.5s

[fortran]use rand_int
real(8):: aa(573,573),bb(573,568),cc(573,568)
aa=rand(aa)
bb=rand(bb)
cc=matmul(aa,bb)[/fortran]

matlab codes costs 0.05s

[bash]aa=rand(573,573);
bb=rand(573,568);
cc=aa*bb;[/bash]

[Nikolay_I_Intel1]

Do matlab really computes product of two matrices before accessing its values?

[alsoran]

I dont understand, all the codes is here, there is no additional codes, and the'rand' function get matrixs differently every time, so i think it did compute product.....

[Nikolay_I_Intel1]

Try to sum all elements in resulting matrix and measure time again.

[alsoran]

i tried sum them, fortran codes costs "0.00000000 sec"

matlab costs "0.0005 sec"

[alsoran]

and if i switch the opimization to "/O3" , fortran codes preformed better than before,but also slower than Matlab if multiply in 100 loops