APSYS

This paper proposes an architecture for optimized resource allocation in Infrastructure-as-a-Service (IaaS)-based cloud systems. Current IaaS systems are usually unaware of the hosted application's requirements and therefore allocate resources ...

We describe Currawong, a tool to perform system software architecture optimisation. Currawong is an extensible tool which applies optimisations at the point where an application invokes framework or library code. Currawong does not require source code ...

Dynamic Datastructure Excavation (DDE) is a new approach to extract datastructures from C binaries without any need for debugging symbols. Unlike most existing tools, DDE uses dynamic analysis (on a QEMU-based emulator) and detects data structures by ...

We argue that recent hypervisor-vs-microkernel discussions completely miss the point. Fundamentally, the two classes of systems have much in common, and provide similar abstractions. We assert that the requirements for both types of systems can be met ...

We revisit the device-driver architecture supported by the majority of operating systems, where a driver is a passive object that does not have its own thread of control and is only activated when an external thread invokes one of its entry points. This ...

Capabilities provide an access control model that can be used to construct systems where safety of protection can be precisely determined. However, in order to be certain of the security provided by such systems it is necessary to verify that their ...

A consistent backup, preserving data integrity across files in a file system, is of utmost importance for the purpose of correctness and minimizing system downtime during the process of data recovery. With the present day demand for continuous access to ...

Human attestation is a promising technique to suppress unwanted bot traffic in the Internet. With a proof of human existence attached to the message, the receiving end can verify whether the content is actually drafted by humans. This technique can ...

There has usually been a clean separation between networks and the applications that use them. Applications send packets over a simple socket API; the network delivers them. However, there are many occasions when applications can benefit from more ...

Recent work on BitTorrent has shown that the choke/unchoke mechanism implements an auction where each peer tries to induce other peers into "unchoking" it by uploading more data than competing peers. Under such a scenario, fast peers tend to trade with ...