Asynchronous Simulation

By default PGENESIS synchronizes all nodes in a zone prior to executing each simulation step. This safety measure introduces significant wait time while the nodes communicate that they are all ready to execute a step. A script can instruct PGENESIS to skip this synchronization so that nodes execute asynchronously:

set /post sync_before_step 0

or conversely, for synchronous execution:

set /post sync_before_step 1

Under asynchronous simulation the only constraint limiting how far in simulation time a node can advance is the set of incoming messages. If node A receives a non-spike message from node B, then A is constrained to wait at step T+dt for data from B from time T (i.e., A cannot get ahead of B). The constraint for spike messages is more relaxed, and is controlled by the lookahead settings.