Deriving Deadlines and Periods for Real-Time Update Transactions

Typically, temporal validity of real-time data is maintained by periodic update transactions. In this paper, we examine the problem of period and deadline assignment for these update transactions such that 1) these transactions can be guaranteed to complete by their deadlines and 2) the imposed CPU workload is minimized. To this end, we propose a novel approach, named the More-Less approach. By applying this approach, updates occur with a period which is more than the period obtained through traditional approaches, but with a deadline which is less than the traditional period. We show that the More-Less approach is better than existing approaches in terms of schedulability and the imposed load. We examine the issue of determining the assignment order in which transactions must be considered for period and deadline assignment so that the resulting CPU workloads can be minimized. To this end, the More-Less approach is first examined in a restricted case where the Shortest Validity First ...

• Type: Conference
• Year: 1999
• Where: RTSS
• Authors: Ming Xiong, Krithi Ramamritham
• Keywords: Control Systems, Cpu Workload, More-Less Approach, RTSS 1999, Update Transaction