#define PARAM_PER_ITERATION 3
#define PARAM_LOST_PER_ITERATION 1
-void myOp(int *invec, int *inoutvec, int *len, MPI_Datatype *dtype) {
+static void myOp(int *invec, int *inoutvec, int *len, MPI_Datatype *dtype) {
for (int i = 0; i < *len; i++)
inoutvec[i] += invec[i];
}