As a new generation of high-performance distributed storage system, object-based storage system is being developed to support high-performance computing environments. In the petabyte-scale object-based storage system,...
详细信息
ISBN:
(纸本)9780819473592
As a new generation of high-performance distributed storage system, object-based storage system is being developed to support high-performance computing environments. In the petabyte-scale object-based storage system, reasonable data distribution and parameters configuration can improve system performance and availability. To make the system performance evaluation work easier, we propose an approximate parameters analysis method to build performance model. We firstly model the whole storage system's architecture based on closed Fork-Join queue model;using our system architecture model, we then deduce an approximately analytical expression with erasure codes and replicas to predict the storage system's mean response time under various workloads simulating the real-world condition. Finally, a large number of comparison experiments validate our approximately analytical expression of system performance, and proved that our analytic method is appropriate to build performance model for object-based storage system.
Summary form only given. Mixed and augmented reality is the nature of the supporting *** current incarnation is cloud computing versus microcontrollers distributedthroughout the *** has always been a catchword of the...
详细信息
ISBN:
(纸本)9781424453900
Summary form only given. Mixed and augmented reality is the nature of the supporting *** current incarnation is cloud computing versus microcontrollers distributedthroughout the *** has always been a catchword of the distributed processing enthusiasts, and each new generation has pushed the idea beyond the horizons of the previous generation. Imagine an environment where most physical objects know where they are, what they are, and can (in principle) network with any other object. Withthis infrastructure, reality becomes its own *** consensual virtual environments are possible, each oriented to the needs of its constituency. If we also have open standards, then bottom-up social networks and even bottom-up advertising become *** the physical world becomes much more like a software construct. the possibilities are both scary and wondrous.
the proceedings contain 54 papers. the topics discussed include: a systematic approach to domain-specific language design using UML;periodic finite-state machines;engineering self-coordinating real-time systems;effici...
详细信息
ISBN:
(纸本)0769527655
the proceedings contain 54 papers. the topics discussed include: a systematic approach to domain-specific language design using UML;periodic finite-state machines;engineering self-coordinating real-time systems;efficient adaptations of the non-blocking buffer for event message communication between real-timethreads;a timing assumption and a t-resilient protocol for implementing an eventual leader service in asynchronous shared memory systems;time-predictable task preemption for real-time systems with direct-mapped instruction cache;integrating priority inheritance algorithms in the real-time specification;analyzing behavior of concurrent software design for embedded systems;and evaluating real-time publish/subscribe service integration approaches in QoS-enabled component middleware.
the following topics are dealt with: objectoriented programming; component based software development; realtimedistributedcomputing; realtime Java; software design; wireless and mobile networks; middleware; compo...
the following topics are dealt with: objectoriented programming; component based software development; realtimedistributedcomputing; realtime Java; software design; wireless and mobile networks; middleware; component execution support; sensor networks; scheduling and resource management; model-driven development; embedded systems; handling time faults; execution time analysis and program verification; and UML and modeling
A wide range of high-performance distributed embedded systems have been designed and deployed. Physically distributed embedded systems are used for manufacturing and control, traffic analysis, and other problems. Inte...
详细信息
ISBN:
(纸本)9780769531328
A wide range of high-performance distributed embedded systems have been designed and deployed. Physically distributed embedded systems are used for manufacturing and control, traffic analysis, and other problems. Interestingly, today's systems-on-chips are sufficiently complex that they must be treated as distributed embedded systems. At all scales of physical extent, middleware is required to manage the computations. this paper looks at distributed embedded systems at several physical scales and considers the types of middleware that are needed to operate these systems.
In this paper, a Role-based Access Control (RBAC) model is applied and extended to a multimedia version called Multi-Role Based Access Control (MRBAC), which can fully support the comprehensive and multilevel security...
详细信息
ISBN:
(纸本)9780769531328
In this paper, a Role-based Access Control (RBAC) model is applied and extended to a multimedia version called Multi-Role Based Access Control (MRBAC), which can fully support the comprehensive and multilevel security control requirements of the distributed multimedia applications. the object-oriented concept is adopted in MRBAC to perform the hybrid role hierarchy management and security roles and rules administration. In summary, MRBAC can: 1) support the multi-level security protection for multimedia data;2) provide access control by checking boththe time constrains and IP addresses;and 3) decentralize the administration functions to make the access control management more efficient.
real-time monitoring is increasingly becoming important in various scenes of large scale, multi-site distributed/parallel computing, e.g, understanding behavior of systems, scheduling resources, and debugging applicat...
详细信息
ISBN:
(纸本)9781424442379
real-time monitoring is increasingly becoming important in various scenes of large scale, multi-site distributed/parallel computing, e.g, understanding behavior of systems, scheduling resources, and debugging applications. Dedicated networks on inter-site communications are rarely available for the monitoring purposes. therefore, for real-time monitoring systems, reducing communication cost is important to handle a large number of nodes with limited network resources. We implemented a real-time Grid monitoring system called VGXP with techniques for low cost data gathering. It tries to send only diffs to recent data, and adapts to the requested data freshness and tolerable errors to minimize required communication. We evaluate monitoring overheads of the proposed method on a distributed environment consisting of 8-sites with 500 nodes. In a realistic setting where the sampling interval is set to 0.5 seconds and the tolerable error to 2%, the CPU usage of the server to gather data from all nodes was 0.2% and the transfer rate was less than 5kbps. the transfer rate did not exceed 50kbps even if we gather a detailed per-process statistics.
暂无评论