Heuristiska algoritmer för schemaläggning i real-tidssystem med hänsyn till data beroenden

• Main Authors: Abdulla, Ariyan, Andersson, Erik
• Format: Others
• Language: Swedish
• Published: Linköpings universitet, Optimeringslära 2018
• Subjects: Scheduling; heuristics; data latency; jitter; single-processor scheduling; Other Mathematics; Annan matematik
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-144794

The schedule for the jobs in a real-time system can have a huge impact on how the system behave. Since real-time systems are common in safety applications it is important that the scheduling is done in a valid way. Furthermore, one can enhance the performance of the applications by minimizing data latency and jitter. A challenge is that jobs in real-time systems usually have complex constraints making it too time consuming to minimize data latency and jitter to optimality. The purpose of this report is to investigate the possibility of creating high quality schedules using heuristics, with the goal to keep the computational time under one minute. This will be done by comparing three different algorithms that will be used on real scheduling instances provided by the company Arcticus. The first algorithm is a greedy heuristic, the second one a local search and the third one is a metaheuristic, simulated annealing. The results indicate that the data latency can be reduced whilst keeping the computational time below one minute.