Reduce

Syntax
reduce[root,operation]

Semantics
All processes in the group will combine their values together at the root process and then the operation will be performed on them.

Example
function void main { var t:Int::allocated[multiple[]]; var x:Int::allocated[multiple[]]; var p;   par p from 0 to 3 { x:(x::reduce[1,"max"];      x:=p;       t:=x;    }; };

In this example, x is to be reduced, with the root as process 1 and the operation will be to find the maximum number. In the first assignment x:=p all processes will combine their values of p and the maximum will be placed into process 1's x. In the second assignment t:=x processes will combine their values of x and the maximum will be placed into process 1's t.

Since: Version 0.41b