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MULTIPROCESSOR AND REALTIIME SCHEDULING (Real Time Scheduling (system…
MULTIPROCESSOR AND REALTIIME SCHEDULING
Deadline Scheduling
real time operating system are designed with the objective of starting real time
generally , not concerned with sheer speed
priorities provide a crude tool
do not capture the requirement of completing
Fall Soft Operation
refers to bility of a system
stability
Real Time Scheduling of Process
Round- RObin Preemptive Scheduler
priority-driven nonpreemtive schedular
Priority-Driven preemptive scheduar on preemption points
Real Time Scheduling
system performs schedulability analysis
result of analysis
Classes of Real Time Scheduling Algorithm
static table driven approaches
performs a statics analysis
result is a schedule that determined at runtime , when a task must begin execution
static priority-driven preemptive appoaches
a static analysis is perfomed but no schedule
analysis is used to assign priorities to task
dyamic planning-based approached
feasibility is determined at runtime
one result of analysis is a schedule
dynamic best effort approaches
no feasibility analysis is performed
system tries to meet all deadlines