In this paper, we present a prototype of the real-time Systems Compiler (RTSC). The RTSC is a compiler-based tool that enables the migration from event-triggered to time-triggered real-time systems. This is achieved b...
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In this paper, we present a prototype of the real-time Systems Compiler (RTSC). The RTSC is a compiler-based tool that enables the migration from event-triggered to time-triggered real-time systems. This is achieved by replacing the real-time systems architecture of a given real-time system. The real-time systems architecture governs the structural properties of the white-box view of a real-time system: how are tasks attached to events and how are dependencies between different tasks implemented. The RTSC uses an abstraction called Atomic Basic Blocks (ABBs) to hide the real-time systems architecture and capture all relevant dependencies of an event-triggered system in a global ABB-graph. The RTSC automatically extracts that ABB-graph from an event-triggered real-time system given as source code, transforms that ABB-graph appropriately, and maps it to a statically computed schedule that could be executed by standard time-triggered real-time operating systems. Important temporal properties of the physical environment of the real-time system needed for that transformation are stored in a system model provided as additional input to the RTSC. Furthermore, we demonstrate the applicability of our approach and the operation of our prototype by transforming an event-triggered control application into a time-triggered equivalent. Copyright (C) 2011 John Wiley & Sons, Ltd.
The interoperability of Web services has resulted in its adoption for recently-emerging cloud platforms. SOAP (Simple object Access Protocol) is considered as the main platform independent communication tool for the C...
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ISBN:
(纸本)9780769544892
The interoperability of Web services has resulted in its adoption for recently-emerging cloud platforms. SOAP (Simple object Access Protocol) is considered as the main platform independent communication tool for the Cloud Web service. Generally, Cloud Web services suffer performance bottlenecks and congestions that are mainly caused by the encoding of XML messages as they are bigger than the real payloads. In this paper, Fractal clustering model is proposed to compute the Fractal clustering similarity of SOAP messages in order to cluster them and enable the aggregation of SOAP messages to significantly reduce the size of the aggregated SOAP messages. Furthermore, as Fractal is a well-known as a time-consuming technique especially for large dataset, two fast Fractal clustering models have been proposed that are aiming to reduce the required clustering time. The proposed fast Fractal models have tremendously outperformed the classical Fractal model in terms of the processing time and have outperformed both K-means and PCA combined with K-means models in terms of both the processing time and SOAP messages size reduction.
Monitoring traffics between applications deployed in a distributedcomputing system (DCS) can help analyzers perceive the dynamic load of each application, and detect the anomalies in all the running processes. Howeve...
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ISBN:
(纸本)9781479936168
Monitoring traffics between applications deployed in a distributedcomputing system (DCS) can help analyzers perceive the dynamic load of each application, and detect the anomalies in all the running processes. However, due to the factors of high dimension and strong periodicity, the traffic data is difficult to visualize and interpret. In this paper, we propose a traffic monitoring approach based on Principal component Analysis (PCA) which is a classical dimension-reduction tool. We find that the first PC represents the overall scale of the traffic while the second PC reflects all nontrivial variations caused by different applications. Then we locate the exact alteration time and identify the very changing applications by a semi-Bayes algorithm on the second PC. We further perform online anomaly detection on new traffics utilizing the previously classified data. Experiments on datasets collected from several distributedcomputing systems including 44 applications show the proposed approach can effectively facilitate DSC traffic monitoring, and outperforms Kmeans and DBSCAN in identifying different system states.
This paper presents an approach for non-instrusively instrumenting standards-based event-based middle-ware. The approach has been realized in an open-source tool called component Port Monitor (CPM). CPM uses dynamic b...
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ISBN:
(纸本)9781538615744
This paper presents an approach for non-instrusively instrumenting standards-based event-based middle-ware. The approach has been realized in an open-source tool called component Port Monitor (CPM). CPM uses dynamic binary instrumentation as a means to monitor events published between software components. This allows CPM to operate in contexts without any a priori knowledge of the concrete events in the system, or how the system is composed. We have applied CPM to applications implemented in the Common object Request Broker Architecture (CORBA). Our results show that once the application is completely instrumented, the performance impact of actually monitoring events is minimal, requiring an additional 2.5 milliseconds.
The proceedings contain 33 papers. The topics discussed include: real-timedistributedobjectcomputing: ready for mission-critical embedded system applications;business process integration for distributed application...
ISBN:
(纸本)076951300X
The proceedings contain 33 papers. The topics discussed include: real-timedistributedobjectcomputing: ready for mission-critical embedded system applications;business process integration for distributed applications in radiology;a case study in testing distributed systems;an object-oriented organic architecture for next generation intelligent reconfigurable mobile networks;mobile RMI: Supporting remote access to java server objects on mobile hosts;how to monitor and control resource usage in mobile agent systems;distributed access knowledge-based system: reified interact ion service for trace and control;and component search service and deployment of distributed applications.
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