Random Number to each Process in MPI

Question

I\'m using MPICH2 to implement an \"Odd-Even\" Sort. I did the implementation but when I randomize to each process his value, the same number is randomized to all processe

Answer 1

It's because your seed does not change enough and the randomness depends on your seed.

From the srand docs:

For every different seed value used in a call to srand, the pseudo-random number generator can be expected to generate a different succession of results in the subsequent calls to rand.

EDIT: Try generating the seed beforehand or change the seed by hand for every srand call.