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LSM-tree has been widely used in data management production systems for write-intensive workloads. However, as read and write workloads co-exist under LSM-tree, data accesses can experience long latency and low throughput due to the interferences to buffer caching from the compaction, a major and frequent operation in LSM-tree. After a compaction, the existing data blocks are reorganized and written...
Fast data analytics at an increasingly large scale has become a critical task in any Internet service company. For example, in Baidu, the major search engine company in China, large volumes of Web and business data in PB-scale are timely and constantly acquired and analyzed for the purposes of evaluating product revenue, tracking product demanding activities on market, predicting user behavior, upgrading...
While the T-S fuzzy model is widely used in fuzzy control systems, the modelling error that will be referred to be as a lumped disturbance should be taken into account in order to improve the control performance. This paper presents a design of disturbance observer as well as state observer, and their existence conditions. Also, example is provided to demonstrate the effectiveness of the approaches...
With the growth in the number of Cloud Service Providers, many enterprises and organizations are now able to use multiple cloud platforms in order to achieve improved overall Quality-of-Service (QoS), reliability and cost efficiency. However, due to the diversity in architecture and functionalities among different cloud platforms, it is difficult to build a system that simultaneously manages multiple...
It is obvious that big, complex enterprise systems are hard to manage. What is not obvious is how to make them more manageable. There are two traditional solutions for management in IT systems. One relies on administrators, but there are lacks of experienced administrators. The other relies on systems themselves, but there are no important progresses in related technologies about self-management,...
Middleware has become the popular runtime infrastructure of modern IT systems. Due to the complex application contexts and various user requirements, more and more applications are now making use of different middleware platforms. It might require the cooperation of several types of middleware, and result in challenging issues for collaborative management of heterogeneous middleware. To solve this...
Under a replacement policy, existing operating systems identify and maintain most frequently used storage data in buffer caches located in main memory, aiming at low-latency I/O data accesses. However, replacement policies can also strongly affect energy consumptions of various connected storage devices, which has not been a consideration in the design and implementation of buffer cache management...
High energy consumption has become a critical challenge in all kinds of computer systems. Hardware-supported Dynamic Power Management (DPM) provides a mechanism to save disk energy by transitioning an idle disk to a low-power mode. However, the achievable disk energy saving is mainly dependent on the pattern of I/O requests received at the disk. In particular, for a given number of requests, a bursty...
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