[Pympi-users] Correct syntax for mpi.gather to concatenate items into a global list?

[Julian C. <rjc...@cs...>]

Can someone tell me what is wrong with the following short script. I'm
trying to gather an item from a local list in each node into the global
list.

>>> import mpi,os
>>> machine = os.uname()
>>> machines[1],mpi.rank
('ale', 0)
('ale', 1)
('ale', 2)
('ale', 3)
# machine[1] is the node name
>>> if mpi.rank ==0:
...     gr = mpi.gather(machines[1])# just get the node name

# at this point pyMPI hangs. I ve tried declaring gr as gr = [] everwhere,
just in the master and also tried not declaring it. pyMPI always hangs.
Usually you cannot assign items to a list, you have to append them, but
possible gather does that under the hood anyway..