Difference between revisions of "Gather"
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Revision as of 17:52, 12 January 2013
Syntax
gather[elements,root]
Semantics
Gather a number of elements (equal to elements) from each process and send these to the root process.
Example
var x:array[Int,12] :: allocated[single[on[2]]];
var r:array[Int,3] :: allocated[multiple[]];
var p;
par p from 0 to 3
{
(x::gather[3,2]):=r;
};
In this example, the variable x is allocated on the root process (2) only. Whereas r is allocated on all processes. In the assignment all three elements of r are gathered from each process and sent to the root process (2) and then placed into variable x in the order defined by the source's PID.
