One of the six categories of management services provided in the Run Time Infrastructure (RTI) to federated simulations is Time Management. Currently, it provides only two message ordering policies, that is, time stamp ordering and receive ordering. Temporal anomalies occurred during the execution of federation due to the heterogeneous latencies in the communication network are not handled in receive ordering. White time stamp ordering eliminates the temporal anomalies entirely, it incurs great communication latency and huge handwidth requirement. This paper presents a new time management mechanism which provides a less costly message ordering service, namely causal ordering, to federates. It does not require the specification of lookahead and allows federates that do not require stringent message ordering properties to achieve much more efficient execution. A series of experiments has been carried out to benchmark the performance of this new time management mechanism and the results show that if incurs a slight overhead compared to receive ordering mechanism but achieves significant performance improvement over time stamp ordering mechanism.
运行时基础结构(RTI)中提供给联邦模拟的六种管理服务之一是时间管理。当前,它仅提供两种消息排序策略,即时间戳排序和接收排序。由于通信网络中的异构延迟,在联盟执行期间发生的时间异常无法按接收顺序进行处理。白色时间戳排序完全消除了时间异常,这导致了很大的通信延迟和巨大的手宽度要求。本文提出了一种新的时间管理机制,该机制为联盟提供了成本更低的消息排序服务,即因果排序。它不需要先行规范,并且允许不需要严格消息顺序属性的联盟可以实现更高效的执行。已经进行了一系列实验,以对这种新的时间管理机制的性能进行基准测试,结果表明,与接收排序机制相比,如果产生一些开销,但与时间戳排序机制相比,则可以实现显着的性能改进。 I> P>
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