OpenMP optimization with c -

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i'm supposed optimize code below make run atleast 16x faster using openmp , memory blocking. far can think of collapsing loops simple statement below. makes run 3 times faster. ideas on making closer 16? 

int i,j; #pragma omp parallel collapse(2)    //my inserted code (i = 0; < msize; i++)     (j = 0; j < msize; j++)         d[i][j] = c[j][i];

when declare inner loop index in outer scope, must use private clause give each thread own copy. collapse may interfere simd vectorization.


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