Sistemas Operativos E De Tempo-real

Redes E Sistemas Autónomos Comunicações Móveis Segurança Em Redes De Comunicações Sistemas Operativos E De Tempo-real

Sistemas Operativos e de Tempo-real
Basic Concepts About Real-Time Systems
Real Time Model
Practical Class 01
- Real-Time Services in Linux
- Using the Linux real-time services
Scheduling Basics
Fixed Priority Scheduling
Practical Class 2
Dynamic Priority Scheduling
Exclusive Access to Shared Resources
Aperiodic Servers
Limited preemption, release jitter and overheads
Profiling and Code Optimization
- Code optimization techniques
- Profiling
Multiprocessor Scheduling, V1.2

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Schedulability tests for DM
Utilization-based test

Deadline Monotonic Scheduling DM

PreviousSchedulability tests based on utilization NextResponse-time analysis

Last updated 2 years ago

Schedulability tests for DM

In some cases tasks may have large periods (low frequency) but require a short response time.

In these cases we assign a deadline shorter than the period, and the scheduling criteria is the deadline.

It is possible to use utilization-based tests.

The adaptation is simple, but the test is very pessimistic.

Utilization-based test

E.g. {C = 0.5, T = 2, D = 1} (Assumed utilization is doubled).