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Saraswat, Prabhat Kumar

Disciplines
  • Mathematics

Abstract

Prabhat Kumar Saraswat - DTU Orbit (27/05/14) Prabhat Kumar Saraswat - DTU Orbit (27/05/14) Prabhat Kumar Saraswat Department of Applied Mathematics and Computer Science 27/12/12 to 03/09/13 Richard Petersens Plads, 322, 213 2800, Kgs. Lyngby [email protected] Phone: 45257505 Job title: PhD student Department of Informatics and Mathematical Modeling 01/07/08 to 03/09/13 Richard Petersens Plads, 322, 213 2800, Kgs. Lyngby [email protected] Phone: 45257505 Job title: PhD student Embedded Systems Engineering 25/02/12 to 18/02/13 Publications: Task Mapping and Bandwidth Reservation for Mixed Hard/Soft Fault-Tolerant Embedded Systems In this paper we are interested in mixed hard/soft real-time fault-tolerant applications mapped on distributed heterogeneous architectures. We use the Earliest Deadline First (EDF) scheduling for the hard real-time tasks and the Constant Bandwidth Server (CBS) for the soft tasks. The bandwidth reserved for the servers determines the quality of service (QoS) for soft tasks. CBS enforces temporal isolation, such that soft task overruns do not affect the timing guarantees of hard tasks. Transient faults in hard tasks are tolerated using checkpointing with rollback recovery. We have proposed a Tabu Search-based approach for task mapping and CBS bandwidth reservation, such that the deadlines for the hard tasks are satisfied, even in the case of transient faults, and the QoS for the soft tasks is maximized. Researchers have used fixed execution time models, such as the worst-case execution times for hard tasks and average execution times for soft tasks. However, we show that by using stochastic execution times for soft tasks, significant improvements can be obtained. The proposed strategy has been evaluated using an extensive set of benchmarks. General information State: Published Organisations: Embedded Systems Engineering, Department of Informatics and Mathematical Modeling Authors: Saraswat, P. K. (Intern)

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