David A. Koufaty

Learn More
Flash Memory based Solid State Drive (SSD) has been called a "pivotal technology" that could revolutionize data storage systems. Since SSD shares a common interface with the traditional hard disk drive (HDD), both physically and logically, an effective integration of SSD into the storage hierarchy is very important. However, details of SSD hardware(More)
Heterogeneous architectures that integrate a mix of big and small cores are very attractive because they can achieve high single-threaded performance while enabling high performance thread-level parallelism with lower energy costs. Despite their benefits, they pose significant challenges to the operating system software. Thread scheduling is one of the most(More)
Recent research advocates asymmetric multi-core architectures, where cores in the same processor can have different performance. These architectures support single-threaded performance and multithreaded throughput at lower costs (e.g., die size and power). However, they also pose unique challenges to operating systems, which traditionally assume homogeneous(More)
With the fast technical improvement, flash memory based Solid State Drives (SSDs) are becoming an important part of the computer storage hierarchy to significantly improve performance and energy efficiency. However, due to its relatively high price and low capacity, a major system research issue to address is on how to make SSDs play their most effective(More)
A heterogeneous processor consists of cores that are asymmetric in performance and functionality. Such a design provides a cost-effective solution for processor manufacturers to continuously improve both single-thread performance and multi-thread throughput. This design, however, faces significant challenges in the operating system, which traditionally(More)
Over the last decade, homogeneous multi-core processors emerged and became the de-facto approach for offering high parallelism, high performance and scalability for a wide range of platforms. We are now at an interesting juncture where several critical factors (smaller form factor devices, power challenges, need for specialization, etc) are guiding(More)
Heterogeneous multicore processors (HMPs), consisting of cores with different performance/power characteristics, have been proposed to deliver higher energy efficiency than symmetric multicores. This paper investigates the opportunities and limitations in using HMPs to gain energy-efficiency. Unlike previous work focused on server systems, we focus on the(More)
Heterogeneous processors that mix big high performance cores with small low power cores promise excellent single-threaded performance coupled with high multi-threaded throughput and higher performance-per-watt. A significant portion of the commercial multicore heterogeneous processors are likely to have a common instruction set architecture( ISA). However,(More)
This paper presents HeteroMates, a solution that uses heterogeneous processors to extend the dynamic power/performance range of client devices. By using a mix of different processors, HeteroMates offers both high performance and reduced power consumption. The solution uses core groups as the abstraction that groups a small number of heterogeneous cores to(More)