R&D on Advanced Data Processing in Hadron Collider Experiments

大型强子对撞机实验数据处理的研究和发展是与欧洲核子研究中心（CERN）的多个合作者联合进行的，主要包括以下三个方面：1.数据采集和真实的时间数据处理分散在探测器前端的一个或一千个缓冲模块中的事件数据碎片必须传送到处理机进行真实的时间处理，需要一种收集数据碎片的机制;称为事件生成器。总数据速率超过100 MB/秒，需要并行传输到多个处理器。KEK通过“全局交通控制系统”构建了事件生成器的模型系统。该系统通过串行数据链路的全局同步交换系统来传输数据片段，利用系统仿真技术对系统的性能进行了测试和分析测试了一个商业ATM交换系统，它是“自路由系统”。我们一起工作，以衡量性能在欧洲核子研究中心和一个 ...更多信息 2.大容量数据的管理与访问研究了带式机器人系统模型系统中大容量数据的存储与访问，并对CORBA标准协议在机器人系统中的数据访问进行了试验，另外还研究了面向对象的数据库管理系统GEANT是一个用于高能物理实验的标准探测器模拟程序。KEK和热尔恩小组合作，通过重新定义程序的规范，用面向对象的方法重新设计了这个大型的FORTRAN程序。程序的设计和分析是按照面向对象的方法进行的。面向设计的技术。通过查询全球GEANT用户社区，采用迭代过程完成设计规范。设计完成后，通过与传统的FORTRAN程序的比较，对C++程序的性能进行了评价，结果表明，在真实的应用中，C++程序上级FORTRAN程序。少

The research and developments for data processing in the large hadron collider experiment has been carried out jointly with various collaborators at CERN in the following three area1.Data acquisition and real time data processingEvent data fragments scattered in handreds or a thousand buffer-modules of the detector front-end must be transmitted to a processor for the real time processing.A mechanism to gather the data fragments is necessary ; called as event builder.The total data rate, more than 100 MB/sec, requires the parallel transfer to many processors.KEK has constructed model system of the event builder by "Global traffic control system" which transfer the data fragments through globally synchronized switching system of serial data link.The performance was measured and analyzed the behavior of the system using system simulation technique.CERN group has tested a commercial ATM switch system which is "Self routing system".We worked together to measure the performance at CERN and a … More nalized the result.These results has been presented in the workshop and symposiums.2.Management and access of large volume dataLarge volume data strorage and its access have been studied in the model system of a tape robotics system.Trial implementation of CORBA standard protocol has been tested for data access in the robot system.The object oriented database management system is being studied separately.3.Development of large scale program library based on object-oriented techniqueGEANT is a standard detector simulation program for high energy physics experiments.KEK and GERN group have worked jointly to rebuild this large FORTRAN program with object-oriented program by redefining the specification of the program.The design and analysis of the program has been done following object-oriented design technique.The design specification was completed with iteration process by inquiring world wide GEANT user community.Upon completion of the design, the programming has started to evaluate the performance o the C++ in comparison with the traditional FORTRAN code.The result showed the C++ program is superior to the FORTRAN in the real application. Less