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Abstract:
A new technique was recently introduced by Bonifaci et al. for the analysis of
real-time systems scheduled on multiprocessor platforms by the global Earliest
Deadline First (EDF) scheduling algorithm. In this paper, this technique is
generalized so that it is applicable to the schedulability analysis of
real-time systems scheduled on multiprocessor platforms by any work-conserving
algorithm. The resulting analysis technique is applied to obtain a new
sufficient global Deadline Monotonic (DM) schedulability test. It is shown that
this new test is quantitatively superior to pre-existing DM schedulability
analysis tests; in addition, the degree of its deviation from any hypothetical
optimal scheduler (that may be clairvoyant) is quantitatively bounded. A new
global EDF schedulability test is also proposed here that builds on the results
of Bonifaci et al. This new test is shown to be less pessimistic and more
widely applicable than the earlier result was, while retaining the strong
theoretical properties of the earlier result.
