Add win_allocate version for all RMA test

[mpichbot]

Originally by monicasee on 2015-06-19 12:04:11 -0500

---

Some RMA tests (i.e., test/mpi/rma/reqops.c) only test win_create, we should add win_allocate version for all of them in order to test shm communication. test/mpi/rma/manyrma2.c is an example to support this.

[hzhou]

Looks like we can pass info hints "shmem" to MPI_Win_alloc. If that enables shared memory RMA, then that is a much easier option to add to the tests.

[yfguo]

Looking at the test mentioned in the example, I don't think the use of of shmem info hint was the intention. The point of using MPI_Win_allocate is that processes on the same node could allocate shared memory in the window, so the RMA between them is shared memory access.

But for this particular test reqops.c, it shouldn't make any difference because only rank 0 allocates the memory.

[yfguo]

Need to check what other tests beside reqops.c need this change.

[yfguo]

I am going to cherry-pick the RMA changes from #5725 and go from there.