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Because of limited memory resource of portable consumer electronics, portable consumer electronics currently exploit swap space with flash memory as a cost effective solution to extend limited memory space. Original swap space management scheme used in Linux for magnetic disk is not available to flash memory-based swap space due to the distinct(More)
Flash memory adopts out-of-place update scheme to solve the erase-before-write constraint of flash memory and the free space of flash memory could be used up. Therefore, garbage collection policy is needed to reclaim garbage and obtain free space. The cleaning cost and the degree of wear-leveling are two primary concerns of garbage collection policy. To(More)
In the current dominant IaaS framework, the centralized VM image management mechanism leads to massive consumption of shared bandwidth resources of an IaaS data center (IDC) in face of a large amount of concurrent deployment tasks and has a limited image management ability in large scale IDCs formed by multiple physic server clusters, causing many problems(More)
For B-tree index structure which requires intensively fine-grained updates/modifications, directly implementing this index structure over flash memory could lead to a significant number of write operations. In this paper, a write-optimized B-tree layer is proposed called WOBF which works over FTL in the flash memory. It could not only reduce the number of(More)
Due to abuse by insiders or penetration by outsiders, network systems usually suffer various security issues. In order to achieve high dependable and low cost monitoring, this paper proposes a dependable monitoring mechanism combining static threshold-based and dynamic anomaly detection. Firstly, the performance metrics of host and network are collected(More)