Closed LaurentPlagne closed 1 year ago
Hi, gather!
is an ImplicitGlobalGrid feature. You can achieve the gathering on rank 0 as shown in this example from the README. This will create a global array (in the example, for visualisation) that you can then handle serially on rank 0 if desired. If a custom gathering is needed, you could also provide it independently of the used packages using MPI functions.
Thank you for your reply. In the example, the gather operation is done with Cartesian Arrays distributed on processes. In my case I have an array (local_history) defined on each process and I want to gather all local histories on process 0 (and make sum of all local_contributions).
I did use plain MPI:
global_history_1D = MPI.Gather(local_history,0,comm)
if me==0
global_history = reshape(global_history_1D,(nh,nprocs))
for h ∈ 1:nh
psum = sum(global_history[h,:])
scs.pressures[h]=psum
end
end
and it seems to give the correct result.
Hi,
I have an array quantity
a
computed on every process and I need to gather all thea
on the process 0. Can I do this gathering operation with ParallelStencil.jl or should I switch to plain MPI programming ?Thank you for your help.