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Proceedings Second International Workshop on Real-Time Computing Systems and Applications最新文献

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Operating system support for continuous media applications-RT-Mach extensions 操作系统支持连续媒体应用程序- rt - mach扩展
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528780
H. Tokuda
{"title":"Operating system support for continuous media applications-RT-Mach extensions","authors":"H. Tokuda","doi":"10.1109/RTCSA.1995.528780","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528780","url":null,"abstract":"In this paper, we describe operating system support for continuous media applications based on our experience of using the Real-Time Mach microkernel. We first address the limitations of the current workstation operating systems. Then, we discuss operating system support for continuous media from three different points of view: architectural support, resource management support, and programming support. Several Real-Time Mach examples are also discussed.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125047879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
The impact of extrinsic cache performance on predictability of real-time systems 外部缓存性能对实时系统可预测性的影响
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528744
J. Busquets-Mataix, J. J. Serrano
{"title":"The impact of extrinsic cache performance on predictability of real-time systems","authors":"J. Busquets-Mataix, J. J. Serrano","doi":"10.1109/RTCSA.1995.528744","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528744","url":null,"abstract":"Cache memories are commonly avoided in real-time systems because of their unpredictable behavior. Recently, some research has been done to obtain tighter bounds on the worst case execution time of cached programs. These techniques usually assume a non preemptive underlying system. However, some techniques can be applied to allow the use of caches in preemptive systems. This paper compares methods for dealing with extrinsic cache behavior (inter-task cache interference). Time-domain oriented methods (the inter-task cache interference is incorporated in the schedulability analysis) are compared to space-domain oriented ones (increase of the cache predictability by assigning private cache partitions to tasks). The obtained results bound the applicability domain for each method for a variety of hardware and workload configurations. The results can be used as design guidelines.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116013707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Scheduling hard-realtime parallel tasks onto the processor network with wrapped mesh topology 将硬实时并行任务调度到具有包裹网格拓扑的处理器网络上
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528777
Y. Kokusho, N. Doi
{"title":"Scheduling hard-realtime parallel tasks onto the processor network with wrapped mesh topology","authors":"Y. Kokusho, N. Doi","doi":"10.1109/RTCSA.1995.528777","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528777","url":null,"abstract":"When scheduling realtime parallel tasks onto multiprocessor systems, it is very important to optimize the computing resource allocations to those tasks using load-distribution mechanisms. This paper proposes a static load-distribution mechanism, called the Double-Layered Load-Distribution (DLLD) mechanism, which schedules hard realtime parallel computing tasks. Due to the nature of the hard realtime computation, the deadlines of task executions must be previously analysed and perfectly satisfied. For this reason, static load-distribution schemes are preferred to dynamic ones. In order to optimize the scheduling results with respect to various types of parallel computing tasks and various architectures of parallel-processor hardware, the DLLD mechanism is comprised of two functional layers: the DF/IHS scheduler (the upper layer) and the DPSTS (the lower layer).","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116390581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fundamental Conflicts in the Design of Real-Time Protocols 实时协议设计中的基本冲突
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528762
H. Kopetz
{"title":"Fundamental Conflicts in the Design of Real-Time Protocols","authors":"H. Kopetz","doi":"10.1109/RTCSA.1995.528762","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528762","url":null,"abstract":"","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129498244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The middleware services for industrial computer systems 中间件服务于工业计算机系统
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528769
Morikazu Takegaki
{"title":"The middleware services for industrial computer systems","authors":"Morikazu Takegaki","doi":"10.1109/RTCSA.1995.528769","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528769","url":null,"abstract":"The \"Diaspect\", the middleware package we have developed, provides basic industrial computing services common to various ICS applications. The Diaspect family includes a real-time data service that supports the programming of reliable hard real-time data processing, a man-machine service that realizes advanced man-machine functions for sophisticated plant operation, a distributed database middleware that manages the consistency of the distributed database and provides user specific views. We extracted these middleware services based on the analysis of many ICS applications. The author describes the concepts behind the development of the Diaspect, and outlines functions of principal middlewares.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"726 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133283179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A new fault-tolerant scheduling technique for real-time multiprocessor systems 一种新的实时多处理器系统容错调度技术
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528772
Tatsuhiro Tsuchiya, Y. Kakuda, T. Kikuno
{"title":"A new fault-tolerant scheduling technique for real-time multiprocessor systems","authors":"Tatsuhiro Tsuchiya, Y. Kakuda, T. Kikuno","doi":"10.1109/RTCSA.1995.528772","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528772","url":null,"abstract":"In multiprocessors used for implementing real-time applications, it is strongly required to ensure that tasks' deadlines are met in spite of faults. In this paper, we discuss fault-tolerant task scheduling techniques in real-time multiprocessor systems where aperiodic tasks arrive dynamically. For fault-tolerance, multiple copies of each task have to be scheduled on distinct processors in such systems. The authors propose a new technique for efficiently scheduling copies of tasks having small laxity. Then, we integrate our technique with previous work and develop a new scheduling algorithm, removing the assumption on task laxity. Simulation results show the effectiveness of our technique.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130195075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 32
A soft aperiodic task scheduling algorithm in dynamic-priority systems 动态优先级系统中的软非周期任务调度算法
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528753
Sungyoung Lee, Hyungill Kim, Jongwon Lee
{"title":"A soft aperiodic task scheduling algorithm in dynamic-priority systems","authors":"Sungyoung Lee, Hyungill Kim, Jongwon Lee","doi":"10.1109/RTCSA.1995.528753","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528753","url":null,"abstract":"In this paper, we present a joint scheduling of hard deadline periodic and soft deadline aperiodic tasks in dynamic-priority systems. The proposed algorithm has extended the fixed-critical task indicating (CTI) algorithm developed by the authors previously (1995). The dynamic-CTI algorithm is operated in such a way that dynamic-priority assignment strategy for a given periodic task set and the information on a deadlinewise preassignment table, called dynamic-CTI table, are mixed dynamically according to the aperiodic tasks' arrivals at runtime. The algorithm has a predictability and a less computational complexity in calculating the slacks since it uses the dynamic-CTI table. Our simulation study shows that the dynamic-CTI scheduling has better performance than the fixed-CTI algorithm which is even better than the slack stealing algorithms, especially under a heavy, transient overload.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"574 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122932185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Performance comparison of real-time architectures using simulation 使用仿真的实时架构性能比较
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528765
Heejo Lee, K. Toda, Jong Kim, K. Nishida, E. Takahashi, Y. Yamaguchi
{"title":"Performance comparison of real-time architectures using simulation","authors":"Heejo Lee, K. Toda, Jong Kim, K. Nishida, E. Takahashi, Y. Yamaguchi","doi":"10.1109/RTCSA.1995.528765","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528765","url":null,"abstract":"This paper presents a performance comparison of real-time system architectures. A discrete event-driven, task-based simulator is developed for evaluating the performance of parallel and distributed real-time systems. Real-time system components such as processor, network architectures, and scheduling policy are included in the simulator. Simulation results show that priority-based communication and scheduling are more suitable for real-time systems than FIFO-based. The strategy of having a dedicated processor, which produces no effect on task execution by scheduling and packet/interrupt handling, is proven to enhance schedulability and predictability. This paper suggests a method for finding an appropriate real-time architecture for users having real-time requirements through the performance prediction of real-time systems.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124109864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The generated order preserving real-time garbage collection 生成的顺序保留实时垃圾收集
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528767
Hiroshi Koide
{"title":"The generated order preserving real-time garbage collection","authors":"Hiroshi Koide","doi":"10.1109/RTCSA.1995.528767","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528767","url":null,"abstract":"This paper proposes a new real-time garbage collection that always preserves the order of object creation. Some programming languages and application programs need to preserve the generated order of objects. The proposed method is the first type of the garbage collection that can be used to make them run in real-time. Since the generated order preserving scavenging garbage collection is partly employed, the complexity of the proposed method is not related to the heap size. The requirements for the real-time processing is also presented.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124996325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Object-oriented design of main-memory DBMS for real-time applications 面向实时应用的内存DBMS的面向对象设计
Proceedings Second International Workshop on Real-Time Computing Systems and Applications Pub Date : 1995-10-25 DOI: 10.1109/RTCSA.1995.528759
S. Cha, Beomyeong Park, Soondong Lee, Sumin Song, J. Park, J. S. Lee, Sumin Park, D. Hur, Gi-Chang Kim
{"title":"Object-oriented design of main-memory DBMS for real-time applications","authors":"S. Cha, Beomyeong Park, Soondong Lee, Sumin Song, J. Park, J. S. Lee, Sumin Park, D. Hur, Gi-Chang Kim","doi":"10.1109/RTCSA.1995.528759","DOIUrl":"https://doi.org/10.1109/RTCSA.1995.528759","url":null,"abstract":"Many applications, such as telecommunication, process control, and virtual reality, require real-time access to database. Main-memory DBMS, which becomes feasible with the increasing availability of large and relatively cheap memory, can provide better performance than disk-based systems for real-time applications. This paper presents an overall architecture of M/sup 2/RT, a main-memory real-time DBMS, and an object-oriented design of its storage system called M/sup 2/RTSS. M/sup 2/RTSS provides classes that implement the core functionality of storage management, real-time transaction scheduling, and recovery. Implemetation-specific information is encapsulated in these classes and extensions can be made by inheritance. With object-oriented features, M/sup 2/RTSS can easily incorporate new development in application requirements and the result of ongoing research in real-time systems.","PeriodicalId":111365,"journal":{"name":"Proceedings Second International Workshop on Real-Time Computing Systems and Applications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127592716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
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