The traditional virtual machine building and and deployment process is centered around the virtual machine hard disk image. The packages comprising the VM operating system are carefully selected, hard disk images are built for a variety of different hypervisors, and images have to be distributed and decompressed in order to instantiate a virtual machine. Within the HEP community, the CernVM Fil...

The performance of applications running within VMs is a significant factor in their adoption. VMware ESX Server was designed for high performance, and its architecture is streamlined to provide high-speed I/O. In this paper, we focus on one component of ESX Server's I/O architecture, its storage subsystem. We look at the characteristics of a series of disk microbenchmarks on several different s...

Recent studies showed that single-machine graph processing systems can be as highly competitive as clusterbased approaches on large-scale problems. While several outof-core graph processing systems and computation models have been proposed, the high disk I/O overhead could significantly reduce performance in many practical cases. In this paper, we propose GraphMP to tackle big graph analytics o...

zFS is a research project aimed at building a decentralized file system that distributes all aspects of file and storage management over a set of cooperating machines interconnected by a high-speed network. zFS is designed to be a file system that scales from a few networked computers to several thousand machines and to be built from commodity off-the-shelf components. The two most prominent fe...

In this paper we describe an efficient implementation of a graph search algorithm for phrase-based statistical machine translation. Our goal was to create a decoder that could be used for both our research system and a real-time speechto-speech machine translation demonstration system. The search algorithm is based on a Viterbi graph search with an A* heuristic. We were able to increase the spe...

In this paper, I explore malware detection using a combination of virtualizationand storage-based intrusion detection techniques. By monitoring disk activity of a virtual machine and correlating that activity to knowledge of the filesystem structure on the virtual machine’s disk, an intrusion detection system can react to file changes immediately. Such a system can use a traditional antivirus s...