IEEE第四届云计算技术和科学国际会议 (4th IEEE international Conference on Cloud Computing Technology and Science) 于2012年12月3-6日在台湾圆山大饭店召开 (http://2012.cloudcom.org/)。整个会议紧扣云计算相关的一些热门话题，诸如虚拟化(virtualization)，安全(Security),  MapReduce, 云相关的高性能计算，服务和应用等 。整个会议论文的录取率 25%， 其中长文录取率17.7%。
论文摘要（英文）

In virtualized environments, the customers who purchase virtual machines (VMs) from a third-party cloud would expect that their VMs run in an isolated manner. However, the performance of a VM can be negatively affected by co-resident VMs. In this paper, we propose vExplorer, a distributed VM I/O performance measurement and analysis framework, where one can use a set of representative I/O operations to identify the I/O scheduling characteristics within a hypervisor, and potentially leverage this knowledge to carry out I/O based performance attacks to slow down the execution of the target VMs. We evaluate our prototype on both Xen and VMware platforms with four server benchmarks and show that vExplorer is practical and effective. We also conduct similar tests on Amazon’s EC2 platform and successfully slow down the performance of target VMs.