DArray: Restrict copyto! scope to destination

Author: yanzin00

src/array/copy.jl

@@ -131,7 +131,14 @@ function darray_copyto!(B::DArray{TB,NB}, A::DArray{TA,NA}, Binds=parentindices(
                 Arange_local = Arange_global_clamped .- CartesianIndex(Arange_start) .+ CartesianIndex{Nmax}(1)
 
                 # Perform local view copy
-                Dagger.@spawn copyto_view!(Out(Bpart), Brange_local, In(Apart), Arange_local)
+                space = (Bpart isa DTask ? fetch(Bpart; move_value=false, unwrap=false) : Bpart).space
+                procs = processors(space)
+                scope = UnionScope([ExactScope(proc) for proc in procs])
+                check_uniform(space)
+                for proc in procs
+                    check_uniform(proc)
+                end
+                Dagger.@spawn scope = scope copyto_view!(Out(Bpart), Brange_local, In(Apart), Arange_local)
             end
         end
     end