Sensors are emerging as a key area of interest in operating systems research, with a main focus on sensor networks. Turning the relationship around, we propose the use of low-power sensors as tools for improving OS-based energy management. Using sensors to detect user intent and physical context we can more directly match system I/O behavior to user needs. FaceOff is a prototype display power m...

There is need of differentiated I/O service when applications with diverse performance-needs share a storagedevice. NVMe specification provides a method called Weighted-Round-Robin-with-urgent-priority (WRR) which can help in providing such differentiated I/O service. In Round-Robin arbitration all I/O queues are treated to be of equal priority, leading to symmetric I/O processing. While in WRR...

v A user-oriented synthetic workload generator that simulates users' file access behavior based on real workload characterization is described. The model for this workload generator is (i) user-oriented and job-unspecific, (ii) represents file I/O operations at the system call level, (iii) allows general distributions for the usage measures, and (iv) assumes independence in the file I/O operati...

In this paper we examine several sparse multi-dimensional TLB designs which provide at least two levels of translation while allowing a TLB entry to map very large amounts of virtual memory. The TLB organisations presented extend our previous work on multi-dimensional TLB designs by allowing the virtual memory mappings to contain mapping holes. The results show that there is a case supporting s...

Organ segmentation is a vital task in diagnostic medicine. The ability to perform it automatically can save clinicians time and labor. In this paper, a method to achieve automatic segmentation of organs in three–dimensional (3D), non–annotated, full–body magnetic resonance (MR), and computed tomography (CT) volumes is proposed. According to the method, training volumes are registered to a chose...

THOR is a persistent object store that provides a powerful programming model. THOR ensures that persistent objects are accessed only by calling their methods and it supports atomic transactions. The result is a system that allows applications to share objects safely across both space and time. The paper describes how the THOR implementation is able to support this powerful model and yet achieve...

Grid computing constitutes one of the most important computing paradigms appeared in the last decade. Data grids are grid system, whosemain concern is the efficient and reliablemanagement of data. These systems have had a growing interest due to the increasing number of applications using a huge amount of data, known as data-intensive applications. They present problems related to both grid sys...

With the growth of broadband networks, the Video-on-Demand (VoD) becomes realistic. Many significant broadcasting schemes are proposed to reduce the bandwidth requirements for stored popular videos, but they cannot be used to support live video broadcast perfectly. Herein, we propose a new broadcasting scheme, called Adaptive Live Broadcasting (ALB) scheme, which supports live video broadcastin...

Parallel I/O systems are gaining popularity as a means for providing scalable high bandwidth I/O. In this paper we develop abstract models of parallel I/O systems and provide empirical results that show how I/O intensive applications interact with the elements of parallel I/O systems. The abstract models are useful for explaining parallel I/O performance to developers of applications requiring ...

For the past 13 years, my research has included the design of high-speed chip-to-chip communication links. When this work started, most chip I/O were TTL levels, and ran at tens of MHz. Our initial work focused on understanding the basic problems of chip I/O, creating the needed circuit blocks to solve these problems, and predicting how the performance would scale with technology. Today the sit...