TokyoTech Virtual Machine Builder (VMB) is a generator of virtual machines. VMB takes a formal specification of a virtual machine and generates implementation of the virtual machine. A specification of a virtual machine comprises configuration of virtual hardware (a set of virtual registers, virtual stacks, and heap organization) and definition of virtual machine instruction set. Behavior of ea...

Modern operating systems specialize in partitioning the physical compute resources of a computer among software applications. Effective partitioning of physical resources enables multiple applications to securely execute on the same physical machine while maintaining performance isolation. In a virtualized environment, a hypervisor partitions physical resources, among virtual machines. This ena...

In this paper we investigate the combination of multitasking and multithreading in a (virtual) shared memory parallel machine running a number of parallel applications. In particular, we investigate whether it is better to run related threads, or unrelated threads on each node to achieve the best system throughput and to complete a mix of applications as quickly as possible. The experiments pro...

As a rising application paradigm and technology, cloud computing can leverage the efficient pooling of ondemand, self-managed virtual infrastructure. How to maximize the resource utilization and how to reduce the cost of configuration are essential issues in cloud computing. In this paper, the authors propose a framework to achieve these objectives by optimizing VM placement and deciding when a...

Public cloud providers lease virtual machines(VM) on a server to customers. This model makes it easier for cloud providers to manage their infrastructure. However, on the other hand, it presents the customers with difficulty in terms of manually selecting the VM instance type. The inherent performance heterogeneity observed in public clouds further leads to the uncertainty of VM performance obs...

The definition of a good view of a 3D scene is highly subjective and strongly depends on both the scene content and the 3D application. Usually, camera placement is performed directly by the user, and that task may be laborious. Existing automatic virtual cameras guide the user by optimizing a single rule, e.g. maximizing the visible silhouette or the projected area. However, the use of a stati...