Index: mpi/__init__.py
===================================================================
--- mpi/__init__.py	(revisión: 13331)
+++ mpi/__init__.py	(copia de trabajo)
@@ -733,6 +734,7 @@
         return pickle.loads(b)
 
 
+garbage_fd = open('grumble.%03d.txt' % world.rank, 'w')
 def synchronize_atoms(atoms, comm, tolerance=1e-8):
     """Synchronize atoms between multiple CPUs removing numerical noise.
     
@@ -749,7 +751,10 @@
     else:
         src = None
 
-    positions, cell, numbers, pbc = broadcast(src, root=0, comm=comm)
+    xx = broadcast(src, root=0, comm=comm)
+    print >> garbage_fd, repr(xx)
+    garbage_fd.flush()
+    positions, cell, numbers, pbc = xx
     ok = (len(positions) == len(atoms.positions) and
           (abs(positions - atoms.positions).max() <= tolerance) and
           (numbers == atoms.numbers).all() and