/*
 * Copyright (C) 2010. See COPYRIGHT in top-level directory.
 */

#include <stdio.h>
#include <stdlib.h>

#include <mpi.h>

#if defined(__CRAYXT) || defined(__CRAYXE) || defined(__CRAYXC) || defined(__CRAYXT_COMPUTE_LINUX_TARGET)
#define NUM_WIN     300    // Cray MPI supports ~900 accordig to Nathan...
#else
#define NUM_WIN     1000   // Error starts at 17.  Up to 16 is ok.
#endif

#define DATA_NELTS  1000
#define DATA_SZ     (DATA_NELTS*sizeof(int))

int main(int argc, char ** argv) {
  int      rank, nproc, i;
  void    *base_ptrs[NUM_WIN];
  MPI_Win  windows[NUM_WIN];

  MPI_Init(&argc, &argv);

  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  MPI_Comm_size(MPI_COMM_WORLD, &nproc);

  if (rank == 0) printf("Starting MPI window creation test with %d processes\n", nproc);

  // Perform a pile of window creations
  for (i = 0; i < NUM_WIN; i++) {
    if (rank == 0) printf(" + Creating window %d\n", i);

    MPI_Alloc_mem(DATA_SZ, MPI_INFO_NULL, &base_ptrs[i]);
    MPI_Win_create(base_ptrs[i], DATA_SZ, 1, MPI_INFO_NULL, MPI_COMM_WORLD, &windows[i]);
  }

  MPI_Barrier(MPI_COMM_WORLD);

  // Free all the windows
  for (i = 0; i < NUM_WIN; i++) {
    if (rank == 0) printf(" + Freeing window %d\n", i);

    MPI_Win_free(&windows[i]);
    MPI_Free_mem(base_ptrs[i]);
  }

  if (rank == 0) printf("Test complete: PASS.\n");

  MPI_Finalize();

  return 0;
}
