openmp is slower than serial for matrix initialization

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I'm just learning how to use openmp but it becomes slower by doing the following. Basically, I'm just trying to initialize a huge 2 dimensional matrix.

219     int **scoreMatrix = malloc(sizeof(int *) * (strlen(seq1)+1));
220 
221     int i,j = 0;
222     omp_set_num_threads(6);
224 #pragma omp parallel private(i,j) 
225 {
226     int std = omp_get_thread_num();
227     //Initialize matrix
228     for(i = std; i < strlen(seq1)+1; i=i+nthreads){
229         scoreMatrix[i] = malloc(sizeof(int) * (strlen(seq2)+1));
230         for(j = 0; j < strlen(seq2)+1; j++){
231             scoreMatrix[i][j] = 0;
232         }
233     }
234 }

Please tell me if I am missing any important syntax or concept in OpenMP. Thank you!

asked 57 secs ago

huddy

1

openmp is slower than serial for matrix initialization