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- José María López, José Luis Díaz, Daniel F. García
- Real-Time Systems
- 2004

The utilization bound for earliest deadline first (EDF) scheduling is extended from uniprocessors to homogeneous multiprocessor systems with partitioning strategies. First results are provided for a basic task model, which includes periodic and independent tasks with deadlines equal to periods. Since the multiprocessor utilization bounds depend on the… (More)

- José Luis Díaz, Daniel F. García, +5 authors Orazio Mirabella
- RTSS
- 2002

This paper describes a stochastic analysis method for general periodic real-time systems. The proposed method accurately computes the response time distribution of each task in the system, thus making it possible to determine the deadline miss probability of individual tasks, even for systems with maximum utilization factor greater than one. The method… (More)

- José María López, Manuel García, José Luis Díaz, Daniel F. García
- ECRTS
- 2000

In this paper we present the utilization bound for Earliest Deadline First (EDF) scheduling on homogeneous multiprocessor systems with partitioning strategies. Assuming that tasks are pre-emptively scheduled on each processor according to the EDF algorithm, and allocated according to the First Fit (FF) heuristic, we prove that the worst-case achievable… (More)

- José María López, José Luis Díaz, Joaquín Entrialgo, Daniel F. García
- Real-Time Systems
- 2008

Exact stochastic analysis of most real-time systems under preemptive priority-driven scheduling is unaffordable in current practice. Even assuming a periodic and independent task model, the exact calculation of the response time distribution of tasks is not possible except for simple task sets. Furthermore, in practice, tasks introduce complexities such as… (More)

- José María López, Manuel García, José Luis Díaz, Daniel F. García
- Real-Time Systems
- 2003

In this paper, we extend Liu and Layland's utilization bound for fixed priority scheduling on uniprocessors to homogeneous multiprocessor systems under a partitioning strategy. Assuming that tasks are pre-emptively scheduled on each processor according to fixed priorities assigned by the Rate-Monotonic policy, and allocated to processors by the First Fit… (More)

- José María López, José Luis Díaz, Daniel F. García
- ECRTS
- 2001

This paper deals with the problem of finding utilization bounds for multiprocessor Rate Monotonic scheduling with partitioning. The minimum and maximum utilization bounds among all the reasonable allocation algorithms are calculated. We prove that the utilization bound associated with the reasonable allocation heuristic Worst Fit (WF) is equal to that… (More)

- Kanghee Kim, José Luis Díaz, Lucia Lo Bello, José María López, Chang-Gun Lee, Sang Lyul Min
- IEEE Trans. Computers
- 2005

This paper describes a stochastic analysis framework for general priority-driven periodic real-time systems. The proposed framework accurately computes the response time distribution of each task in the system, thus making it possible to determine the deadline miss probability of individual tasks, even for systems with a maximum utilization factor greater… (More)

- José María López, José Luis Díaz, Daniel F. García
- IEEE Transactions on Parallel and Distributed…
- 2004

The utilization bound for real-time rate monotonic (RM) scheduling on uniprocessors is extended to multiprocessors with partitioning-based scheduling. This allows fast schedulability tests to be performed on multiprocessors and quantifies the influence of key parameters, such as the number of processors and task sizes on the schedulability of the system.… (More)

The exact stochastic analysis of most real-time systems is becoming unffordable in current practice. On one side, the exact calculation of the response time distribution of the tasks is not possible except for simple periodic and independent task sets. On the other side, in practice, tasks introduce complexities like release jitter, blocking in shared… (More)

- José L. Díaz, Pilar Barreto, José M. Gallego, Javier Barbero, Ramón Bayés, Juan A. Barcia
- Acta Neurochirurgica
- 2009

We aim to analyse the relationship between the quality of information during the decision-making process regarding surgery to treat high-grade gliomas and the level of anxiety of the patients. This is a transversal, descriptive and correlational study on 26 patients with a clinical and radiological diagnosis of high-grade glioma. They scored the quality (in… (More)