This paper addresses the issue of improving the performance of memory management for real-time Java applications, building upon the real-time speci®cation for Java (RTSJ) from the Real-Time Java Expert Group. In a ®rst step, a collecting dynamic memory solution including both a real-time garbage collector and region-based memory management, is proposed. A thorough analysis of the parameters in¯uencing the performance of write barriers in memory management, together with ways of improvement are then presented. Finally, the implementation of a memory management solution compliant with the RTSJ and integrating the proposed improvements is sketched.

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The use of wireless Pdas is foreseen to outrun the one of Pcs in the near future. However, for this to actually happen, adequate software environments must be devised in order to allow the execution of various types of applications. This paper introduces the base features of such a n e n vironment, which is a customizable Jvm-based middleware. In particular, the middleware platform embeds services for appropriate resource management and for supporting novel Pda-oriented applications.

Nowadays the appliance market is growing faster and faster. These computers are going to support in the near future new applications like high delity music player, video on demand, or video conference. In this context, real-time (due to multimedia applications) and autonomy are still main concerns for these embedded computers. To solve those problems, we introduce in this position paper a new approach based on the combination of real-time and power management in the scheduler of the operating system.

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