Hello.
I am wondering if there is a way to change a mapping of a distributed array.
For example:
use BlockDist;
var domC = {0..0} dmapped Block({0..0});
var C: [domC] int;
writeln("Initially, C is: ", C);
for i in 0..5 {
domC = {0..i}; // dmapped Block({0..i}); // needed, or halt on assignment
C(i) = C(i).locale.id;
writeln("C(", i, ") assigned, C is: ", C, ". domC is ", domC);
}
On 2 nodes I get:
Initially, C is: 0
C(0) assigned, C is: 0. domC is {0..0}
C(1) assigned, C is: 0 1. domC is {0..1}
C(2) assigned, C is: 0 1 1. domC is {0..2}
C(3) assigned, C is: 0 1 1 1. domC is {0..3}
C(4) assigned, C is: 0 1 1 1 1. domC is {0..4}
C(5) assigned, C is: 0 1 1 1 1 1. domC is {0..5}
I understand why is this, but I am looking for a way to add values to a
distributed array and then “rebalance” the distribution at some point. So there
are 2 questions I have:
1. Is there a way to do this with arrays at all without somehow creating a
whole new array?
2. Is there any better approach for this?
To give some context, I am trying to come up with a simple distributed graph
data structure (similar to CSR in that vertices are distributed, but not
necessarily adjacencies) that allows adding of new vertices. If I add a new
vertex, I need to put it into a distributed data structure. With arrays with
Block distribution, everything outside of the bounding box seems to go to the
last locale. I am not necessarily looking for the most efficient solution at
this point but rather for something simple using the basic language mechanisms
in Chapel.
Thank you,
Marcin
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