G - Physics – 06 – F
Patent
G - Physics
06
F
354/1
G06F 17/50 (2006.01)
Patent
CA 1294046
BOUNDED LAG DISTRIBUTED DISCRETE EVENT SIMULATION METHOD AND APPARATUS Abstract A discrete event simulation system that avoids all blocking and advances the simulation time in an efficient manner by treating the simulated system as a set of subsystems and simulating the subsystems concurrently. The simulation proceeds iteratively by restricting the simulation of scheduled events for each subsystem at any one time to a chosen simulated time segment (bounded lag) beginning with the lowest simulation time found among the subsystems. With each simulation iteration, an "at risk" demarcation time is evaluated based only on a subset of the subsystems that can potentially affect the simulation at the considered subsystem. Events scheduled for a time earlier than the "at risk" time are simulated. In simulating systems where some subsystems affect other subsystems only through intermediate subsystems, opaque periods can be experienced when, because of the specific process that is being simulated, such an intermediate subsystem "promises" that a particular route emanating from this subsystem would be busy for a set period of time, and thereby also "promises" that no other subsystem can use this route as a conduit to affect other subsystems. That tends to push forward the "at risk" demarcation time.
581027
Kirby Eades Gale Baker
Ncr Corporation
LandOfFree
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