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Legion Runtime
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#include <legion.h>
A DynamicCollective object is a special kind of PhaseBarrier that is created with an associated reduction operation. Arrivals on a dynamic collective can contribute a value to each generation of the collective, either in the form of a value or in the form of a future. The reduction operation is used to reduce all the contributed values (which all must be of the same type) to a common value. This value is returned in the form of a future which applications can use as a normal future. Note that unlike MPI collectives, collectives in Legion can have different sets of producers and consumers and not all producers need to contribute a value.
1.9.1