Duplicated random number sequences on all processes

[piyueh]

In the basic MPI example (Send/Recv), we use the same seed to initialize random number generators (here) on all processes. It will cause the random number sequences generated on all MPI processes to be the same with each others, won't it?

If it will, then that means we are not using more random points to improve the accuracy when we use more MPI processes. However, the tutorial says:

This is a more accurate, because each node is running as many iterations as the singe node in the serial code ran.

which may not be true in this case, because each MPI process generates exactly the same set of random points.