Browsing by Author "Lin, Houcheng"

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Application Dependency Tracing for Message Oriented Middleware
(2014)
Wu, Li-Juin
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Li, Hong-Wei
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Cheng, Yu-Jui
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Wu, Yu-Sung
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Lin, Houcheng
Software defined infrastructure greatly reduces the deployment cost of distributed applications. Many distributed applications employ message oriented middleware (MOM) for the integration of heterogeneous components and to achieve scalability and fault tolerance. The structure of a distributed application can be very complex. In addition, the asynchronous message delivery model of MOM further complicates the runtime behavior of a distributed application. To diagnose a faulty distributed application, one often needs to determine the dependences of its messages, and by extension, the dependences of its components. We propose Message Tracer to identify the message dependencies of a MOM-based distributed application. Message Tracer sniffs the network traffic of MOM and uses knowledge of message broker protocols to establish the dependencies. Message Tracer makes no assumption on the application threading model and incurs negligible performance overhead. Message Tracer correctly identified 95% of the dependencies for the common use cases and 75% of the dependencies when the system was under extreme stress.
Smartphone Virtualization
(2016)
Chiueh, Tzi-cker
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Lin, Houcheng
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Chao, Ares
;
Anthony
;
Wu, Tan-Gen
Virtualization plays a pivotal role in the success of cloud computing service models and is applied extensively in modern public and private data centers. However, its adoption on end user devices such as laptop/desktop computers and cell phones is relatively scarce, mainly because convincing use cases for client device virtualization have proven elusive so far. As smartphones emerge as the linchpin of everyday computing and communication for regular people and application download becomes a fact of life, the Bring Your Own Cloud (BYOD) problem, in which corporate employees connect their own smartphones to the corporate networks for office work, has put most enterprises in an unenvious position of making a difficult choice between corporate security and employee productivity. One effective solution to the BYOD problem is smartphone virtualization, which provides multiple virtual smartphones on a physical smartphone, and enables a user to use a highly secure but not so flexible virtual smartphone in the work environment and a less secure but more flexible virtual smartphone when outside the work environment. This paper describes the design and implementation of a comprehensive smartphone virtualization system called Brahma, which consists of a virtualized smartphone element and a virtual mobility infrastructure element, and presents the detailed evaluation results of the first Brahma prototype on a commercial smartphone.