We derive recursive formulas for computing the state probabilities in priority queueing systems (preemptive and non-preemptive). The derivation is based only on the general structure of the generating function involved, and thus is simpler and more general than previous methods. We also discuss the applications of our method to other queueing systems.

We consider scheduling on a single machine with one non-availability period to minimize the weighted sum of completion times. We provide a preemptive algorithm with an approximation ratio arbitrarily close to the Golden Ratio, (1+ √ 5)/2+ε, which improves on a previously best known 2approximation. The non-preemptive version of the same algorithm yields a (2 + ε)-approximation.

The problem of nding a large independent set in a hyper-graph by an online algorithm is considered. We provide bounds for the best possible performance ratio of deterministic vs. randomized and non-preemptive vs. preemptive algorithms. Applying these results we prove bounds for the performance of online algorithms for routing problems via xed paths over networks.

This paper presents a Probabilistic Preemptive (PP) scheduling discipline for service differentiation in Optical Burst Switching (OBS) networks. The main idea of PP is that a probabilistic parameter is added to the preemptive scheduling discipline. With PP, a high priority burst preempts a low priority burst in a probabilistic manner. By changing the probabilistic parameter, PP can achieve flex...

In this paper we implement the EDF-VD (Earliest Deadline First with Virtual Deadline) algorithm described in [1] for scheduling mixed-criticality, realtime task systems on preemptive uniprocessor platforms. We compare the scheduling overheads of this algorithm with the scheduling overheads of the well known EDF (Earliest Deadline First) algorithm for scheduling realtime task systems on preempti...

We consider a single machine earliness/tardiness scheduling problem with general weights, ready times and due dates. Using completion time information obtained from the optimal solution to a preemptive relaxation, we generate feasible solutions to the original non-preemptive problem. We report extensive computational results demonstrating the speed and effectiveness of this approach.

— In this paper, we propose a Probabilistic Preemptive (PP) scheme for service differentiation in Optical Burst Switching (OBS) networks. By changing the preemptive probability, an OBS node can adjust the ratio of burst blocking probability between different traffic classes, while the overall blocking probability is not affected.

We present a computer-aided programming approach to concurrency. The approach allows programmers to program assuming a friendly, non-preemptive scheduler, and our synthesis procedure inserts synchronization to ensure that the final program works even with a preemptive scheduler. The correctness specification is implicit, inferred from the non-preemptive behavior. Let us consider sequences of ca...

Advanced implantable sensors offer preemptive disease-fighting capabilities, if they can overcome challenges around engineering, regulation, patients, and clinicians.