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Träfflista för sökning "WFRF:(Behnam Moris) ;pers:(J. Bril Reinder)"

Sökning: WFRF:(Behnam Moris) > J. Bril Reinder

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  • Behnam, Moris, et al. (författare)
  • Improved SIRAP analysis for synchronization in hierarchical scheduled real-time systems
  • 2009
  • Ingår i: Proceedings of 14th IEEE International Conference on Emerging Techonologies and Factory (ETFA'09). - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • We present our ongoing work on synchronization in hierarchical scheduled real-time systems, where tasks are scheduled using fixed-priority pre-emptive scheduling. In this paper, we show that the original local schedulability analysis of the synchronization protocol SIRAP is very pessimistic when tasks of a subsystem access many global shared resources. The analysis therefore suggests that a subsystem requires more CPU resources than necessary. A new way to perform the schedulability analysis is presented which can make the SIRAP protocol more efficient in terms of calculated CPU resource needs.
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  • Keskin, Ugur, et al. (författare)
  • Improving the global schedulability analysis of overrun without payback
  • 2010
  • Ingår i: Proceedings of the Work-In-Progress (WIP) session of the 22nd Euromicro Conference on Real-Time Systems (ECRTS'10).
  • Konferensbidrag (refereegranskat)abstract
    • Overrun without payback has been proposed asa mechanism for a stack resource policy (SRP) based synchronizationprotocol for hierarchical scheduling frameworks(HSFs). In this paper we reconsider the global schedulabilityanalysis of an HSF based on two-level fixed-priority preemptivescheduling (FPPS) using overrun without payback asa mechanism. Improved analysis is presented based on theobservation that there is no need to guarantee the overrunbudget before the end of the budget period, because thatadditional amount of resources is only meant to prevent depletionof a budget during global resource access. The resultingimprovement is illustrated by means of an example. Thepossibility to discard the remainder of an overrun budget upona replenishment is briefly considered as a further improvementand its potential is shown using the same example.
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  • Nemati, Farhang, et al. (författare)
  • Investigation of Implementing a Synchronization Protocol under Multiprocessors Hierarchical Scheduling
  • 2009
  • Ingår i: Proceedings of the Work-In-Progress (WIP) session of 14th IEEE International Conference on Emerging Techonologies and Factory (ETFA'09). - 9781424427284
  • Konferensbidrag (refereegranskat)abstract
    • In the multi-core and multiprocessor domain, there has been considerable work done on scheduling techniques assuming that real-time tasks are independent. In practice a typical real-time system usually share logical resources among tasks. However, synchronization in the multiprocessor area has not received enough attention. In this paper we investigate the possibilities of extending multiprocessor hierarchical scheduling to support an existing synchronization protocol (FMLP) in multiprocessor systems. We discuss problems regarding implementation of the synchronization protocol under the multiprocessor hierarchical scheduling.
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  • Sandström, Kristian, et al. (författare)
  • On Jitter in Time Partitioned Real-Time Systems
  • 2012
  • Ingår i: 17th IEEE International Conference on Emerging Technologies & Factory Automation (ETFA'12), Work-in-Progress (WiP) session. - Krakow, Poland.
  • Konferensbidrag (refereegranskat)
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8.
  • Sandström, Kristian, et al. (författare)
  • On Jitter in Time Partitioned Real-Time Systems
  • 2012
  • Ingår i: IEEE Symposium on Emerging Technologies and Factory Automation, ETFA 2012. - 978-146734737-2
  • Konferensbidrag (refereegranskat)abstract
    • Recent trends towards adopting hypervisors, hierarchical scheduling, and other virtualization technologies that achieve partitioned access to the CPU and other resources impose significant impact with respect to jitter performance in embedded real-time systems. In this paper we make a first step towards characterization, modeling and calculation of this jitter.
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  • van den Heuvel, Martijn, et al. (författare)
  • Opaque Analysis for Resource Sharing in Compositional Real-Time Systems
  • 2011
  • Ingår i: 4th Workshop on Compositional Theory and Technology for Real-Time Embedded Systems (CRTS'11).
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we propose opaque analysis methods to integrate dependent real-time components into hierarchical fixed-priority scheduled systems. To arbitrate mutually exclusive resource access between components, we consider two existing protocols: HSRP - comprising overrun with and without payback - and SIRAP. An opaque analysis allows to postpone the choice of a synchronization protocol until component integration time. First, we identify the sources of pessimism in the existing analysis techniques and we conclude that both protocols assume different models in their local analysis. In particular, the compo- sitional analysis for overrun with payback (OWP) is not opaque and is pessimistic. The latter makes OWP expensive compared to its counter part without a payback mechanism (ONP). This paper presents an opaque and less pessimistic OWP analysis. Secondly, SIRAP requires more timing information to perform a task-level schedulability analysis. In many practical situations, however, detailed timing characteristics of tasks are hard to obtain. We introduce an opaque analysis for SIRAP using the analysis of ONP to reduce the required timing information during the local analysis. We show that the analysis for ONP cannot deem systems schedulable which are infeasible with SIRAP. The SIRAP analysis may therefore reduce the required system resources of a component by sacrificing the choice for an arbitrary synchronization protocol at system integration time.
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  • Resultat 1-10 av 11
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Behnam, Moris, (11)
Nolte, Thomas, (10)
Lukkien, Johan (2)
Åsberg, Mikael, (2)
Sandström, Kristian, (2)
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van den Heuvel, Mart ... (2)
Nemati, Farhang, (1)
Shin, Insik, (1)
Keskin, Ugur, (1)
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Mälardalens högskola (11)
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