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Technical Report HW-MACS-TR-0073


TitleComplete Experimental and Theoretical Analysis of Greedy Effects in Autonomous Mobility.
AuthorsNatalia Chechina, Peter King, Phil Trinder
Date2010-06-10
AbstractDistributed load balancers exhibit thrashing where tasks are repeatedly moved between locations due to incomplete global load information. This paper shows that systems of Autonomous Mobile Programs (AMPs) exhibit the same behaviour, identifying two types of redundant movement and terming them greedy effects. AMPs are unusual in that, in place of some external load management system, each AMP periodically recalculates network and program parameters and may independently move to a better execution environment. Load management emerges from the behaviour of collections of AMPs. The paper explores the extent of greedy effects by simulation and proposes negotiating AMPs (NAMPs) to ameliorate the problem. We present the design of AMPs with a cooperative/competitive negotiation scheme (cNAMPs), and compare their performance with AMPs by simulation. We establish new properties of balanced networks of AMPs, and use these to provide a theoretical analysis of greedy effects.
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