A New Real-Time Scheduling Scheme on Real-Time CORBA Systems
Seung-Min Baek, Seong-Cheon Kim · Jeongbo gwahaghoe nonmunji. si'seu'tem mich i'lon · 2001
RT SIG(Real-Time Special Interest Group) of OMG has led many researches for the real-time multimedia data processing on the CORBA system, The extended standard of CORBA for real-time processing is called RT(Real-Time) CORBA. The core of RT CORBA is the real-time scheduling scheme that can guarantee the real-time QoS by minimizing the blocked ratio of real-time tasks. The most of now a days proposed scheduling schemes are the kinds of previous priority-based scheduling schemes for uni-processor systems. But these soft real-time scheduling schemes can not guarantee good performance on the distributed computer systems of various performance parameters.This paper proposes a hard real-time scheduling scheme, CII(Cut In Interval). The previous global priority-based scheduling schemes only offer the inefficient task allocation and local scheduling. But CII-based scheduling scheme offers simpler and more efficient global scheduling. The key point of CIIis the following. The remained time, resulting from putting off the already scheduled task possibly till the deadline, can be spared for the other tasks. The use of remained-time proves that CII-based scheduling scheme is more active and efficient scheduling scheme than previous priority-based schemes.