Under high loads, a multimedia cluster server can serve many hundreds of connections concurrently, where a load balancer distributes the incoming connection request to each node according to a preset algorithm. Among ...Under high loads, a multimedia cluster server can serve many hundreds of connections concurrently, where a load balancer distributes the incoming connection request to each node according to a preset algorithm. Among existing scheduling algorithms, round-Robin and least-connection do not take into account the difference of service capability of each node and improved algorithms such as weighted round-Robin and weighted least-connection. They also do not consider the fact that the ratio of number of TCP connections and the fixed weight does not reflect the real load of node. In this paper we introduce our attempts in improving the scheduling algorithms and propose a variable weighted least-connection algorithm, which assigns variable weight, instead of fixed weight, to each node according to its real time resource. A validating trial has been performed and the results show that the proposed algorithm has effective load balancing in one central control node scenario.展开更多
A Multimedia streams dynamic rate control algorithm based on Fuzzy adaptive PID （MFPID） has been proposed to implement multimedia streams＇ end sending rate on-line self-regulating and smoothing, and to track system...A Multimedia streams dynamic rate control algorithm based on Fuzzy adaptive PID （MFPID） has been proposed to implement multimedia streams＇ end sending rate on-line self-regulating and smoothing, and to track system resources in time, so that it can avoid system＇s regulating oscillation and guarantee system＇s stability. And, some work has been done to analyze adaptive session model of multimedia streams, to implement future available bandwidth estimation of IP network, to achieve PID parameters＇ on-line self-tuning by fuzzy controlling. Simulation validated the theoretical results of MFPID.展开更多
文摘Under high loads, a multimedia cluster server can serve many hundreds of connections concurrently, where a load balancer distributes the incoming connection request to each node according to a preset algorithm. Among existing scheduling algorithms, round-Robin and least-connection do not take into account the difference of service capability of each node and improved algorithms such as weighted round-Robin and weighted least-connection. They also do not consider the fact that the ratio of number of TCP connections and the fixed weight does not reflect the real load of node. In this paper we introduce our attempts in improving the scheduling algorithms and propose a variable weighted least-connection algorithm, which assigns variable weight, instead of fixed weight, to each node according to its real time resource. A validating trial has been performed and the results show that the proposed algorithm has effective load balancing in one central control node scenario.
基金This workis supported by the Chinese High Technology Development Project"863"(2003AA121560) .
文摘A Multimedia streams dynamic rate control algorithm based on Fuzzy adaptive PID （MFPID） has been proposed to implement multimedia streams＇ end sending rate on-line self-regulating and smoothing, and to track system resources in time, so that it can avoid system＇s regulating oscillation and guarantee system＇s stability. And, some work has been done to analyze adaptive session model of multimedia streams, to implement future available bandwidth estimation of IP network, to achieve PID parameters＇ on-line self-tuning by fuzzy controlling. Simulation validated the theoretical results of MFPID.
