【摘要】 以北京谱仪数据获取系统一个读出分支的单机箱读出模型为例,为提高实时系统性能及可扩展性要求,提出了一个基于VM E总线的面向多处理器应用的数据采集系统的实现方法。对多处理器任务之间的通信和同步采用了中断机制来实现,同时保证事例片段组装时的顺序以及事例数据上传时的保序问题。经测试,该系统能够稳定运行,与单处理器系统的应用相比较,CPU占有率降低了将近一半,并在实时性能方面也满足了系统需求,为将来系统升级提供了一个可扩展的平台。更多还原

【Abstract】 A Beijing Spectrome Ⅲ(BESⅢ) data acquisition readout branch based on multiple processors in one VME crate was built to improve the performance and scalability of real-time systems.An interrupt mechanism was developed to handle the inter-task communications and the synchronization of the multiple processors.The event data sequence was correct in a test with a PowerPC reading data from the electronics front end and transferring it to a readout PC.The CPU occupancy is reduced compared with single processor systems.The real-time performance satisfies the technical requirements with a scalable system platform planned for the future.更多还原