[OMPI devel] malloc(0) warnings in post/wait and start/complete calls with GROUP_EMPTY

[Lisandro Dalcin]

You might argue that the attached tests are naive, but still... (Open
MPI v1.10.2)

$ mpicc win_post_wait.c
$ mpiexec -n 1 ./a.out
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
$ mpiexec -n 2 ./a.out
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)

$ mpicc win_start_complete.c
$ mpiexec -n 1 ./a.out
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
$ mpiexec -n 2 ./a.out
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 76)
malloc debug: Request for 0 bytes (osc_pt2pt_active_target.c, 78)


-- 
Lisandro Dalcin
============
Research Scientist
Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
Numerical Porous Media Center (NumPor)
King Abdullah University of Science and Technology (KAUST)
http://numpor.kaust.edu.sa/

4700 King Abdullah University of Science and Technology
al-Khawarizmi Bldg (Bldg 1), Office # 4332
Thuwal 23955-6900, Kingdom of Saudi Arabia
http://www.kaust.edu.sa

Office Phone: +966 12 808-0459

#include <mpi.h>
int main(int argc, char *argv[])
{
  MPI_Win win;
  MPI_Init(&argc, &argv);
  MPI_Win_create(MPI_BOTTOM, 0, 1, MPI_INFO_NULL, MPI_COMM_WORLD, &win);
  MPI_Win_start(MPI_GROUP_EMPTY, 0, win);
  MPI_Win_complete(win);
  MPI_Win_free(&win);
  MPI_Finalize();
  return 0;
}

#include <mpi.h>
int main(int argc, char *argv[])
{
  MPI_Win win;
  MPI_Init(&argc, &argv);
  MPI_Win_create(MPI_BOTTOM, 0, 1, MPI_INFO_NULL, MPI_COMM_WORLD, &win);
  MPI_Win_post(MPI_GROUP_EMPTY, 0, win);
  MPI_Win_wait(win);
  MPI_Win_free(&win);
  MPI_Finalize();
  return 0;
}