update:
After playing for a little bit, I'm more confused now:
if I have a distributed domain D, and array B declared on D, the following
code 1 will work and 2 will fail in runtime with an error "cannot access
remote data in local block", why is that?
1. work
forall b in B {
local {
b = here.locale.id;
}
}
2. fail
forall d in D {
local {
B[d] = here.locale.id;
}
}
On Mon, Aug 7, 2017 at 1:06 PM, Hui Zhang <[email protected]> wrote:
> Hello,
>
> I have a question about the data distribution in Chapel, for example we
> have:
>
> const D = {1..8} dmapped Block({1..8});
> var B: [D] real;
> forall d in D {
> var A : 8*real;
> foo(A, B[d]);
> }
>
> So in multilocale, even though the domain D is distributed, the variable
> A declared in each iteration is still allocated on node0 right? which means
> we can not add "local" clause around the loop body since foo needs to
> access A from other nodes which requires communication, like:
> local {
> var A: 8*real;
> foo(A, B[d]);
> }
>
> or
>
> var A: 8*real;
> local {
> foo(A, B[d]);
> }
>
>
> Further, is it true that the only ways to put data on nodes other than 0
> are:
> 1. use explict "on" clause, everything inside it will be allocated on the
> specific locale
> 2. use distributed domain: piece of the data will be allocated on each
> locale.
> ?
>
> Thanks
> --
> Best regards
>
>
> Hui Zhang
>
--
Best regards
Hui Zhang
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