All Windows memory analysis techniques depend on the examiner’s ability to translate the virtual addresses used by programs and operating system components into the true locations of data in a memory image. In some memory images up to 20% of all the virtual addresses in use point to so called “invalid” pages that cannot be found using a naive method for address translation. This paper explains ...

File systems that employ caching have been built for many years. However, most work in file systems has been done as part of monolithic operating systems. In this paper we give our experience with building a high-performance distributed file system on Spring, a highly modular operating system where system services such as file systems are provided as user-level servers. The Spring file system d...

The memory management of distributed objects, when done manually, is an error-prone task. It leads to memory leaks and dangling references causing applications to fail. Avoiding such errors requires automatic memory management, named distributed garbage collection (DGC). Current DGC solutions are either not safe, not complete or not portable to widely used platforms such as .NET. As a matter of...

Java is being widely adopted as one of the software platforms for the seamless integration of diverse computing devices. Over the last year, there has been great momentum in adopting Java technology in devices such as cell-phones, PDAs, and pagers where optimizing energy consumption is critical. Since, traditionally, the Java virtual machine (JVM), the cornerstone of Java technology, is tuned f...

The memory management of distributed objects, when done manually, is an error-prone task. It leads to memory leaks and dangling references, causing applications to fail. Avoiding such errors requires automatic memory management, called distributed garbage collection (DGC). Current DGC solutions are either not safe, not complete or not portable to widely used platforms such as .NET. As a matter ...

An experimental study comparing different user interfaces for a virtual drum is reported. Virtual here means that the drum is not a physical object. 16 subjects played the drum on five different interfaces and two metronome patterns trying to match their hits to the metronome clicks. Temporal accuracy of the playing was evaluated. The subjects also rated the interfaces subjectively. The results...

Virtual machine live migration is a method of moving virtual machine across hosts within a virtualized datacenter. It provides significant benefits for administrator to manage datacenter efficiently. It reduces service interruption by transferring the virtual machine without stopping at source. Transfer of large number of virtual machine memory pages results in long migration time as well as do...

This paper explores the idea of using Genetic Programming (GP) to evolve Java Virtual Machine (JVM) byte code to solve a sample symbolic regression problem. The evolutionary process is done completely in memory using a standard Java environment.

We extend the Xen virtual machine monitor with the ability to host a hundred of virtual machines on a single physical node. Similarly to a demand paging of virtual memory, we page out idle virtual machines making them available on demand. Paging is transparent. An idle virtual machine remains fully operational. It is able to respond to external events with a delay comparable to a delay under a ...

Current garbage collection (GC) techniques do not (and in general cannot) collect all the garbage that a program produces. This may lead to a performance slowdown and to programs running out of memory space. In this paper, we present a practical algorithm for statically detecting memory leaks occurring in arrays of objects in a garbage collected environment. No previous algorithm exists. The al...