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SUNMONTUEWEDTHUFRISAT
Events for March 09, 2007
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The Case for Data-Driven Multithreading: Scaling the Memory Wall
Fri, Mar 09, 2007 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
CENG SEMINAR SERIES"The Case for Data-Driven Multithreading: Scaling the Memory Wall"Dr. Paraskevas (Skevos) EvripidouDepartment of Computer ScienceUniversity of CyprusAbstract:Over the last five decades computer designers were able to design and build faster and faster computers by relying on improvements on fabrication technologies and architectural/organization optimizations. However, over the last five years the most severe limitations of the sequential model, namely its inability to tolerate long latencies has slowed down the performance gains, forcing the industry to hit the Memory wall. As a result the entire industry had to switch to multiple cores per chip and thus move into the concurrency era. New concurrent models/paradigms are needed in order to fully utilize the potential of Multi-core chips. The Dataflow model is a formal model that can handle concurrency and it can tolerate memory and synchronization latency. Consequently, we propose Data-Driven Multithreading (DDM), as it does not suffer from the above-mentioned limitations. This is because DDM is not based on the von Neumman model of execution but instead on the data-flow model of execution, which is side effect free. Thus, the memory latencies can be tolerated without the huge performance penalties of the von Neumann model. Furthermore, the data-driven scheduling does not require the complexity of the multiple issue and out-of-order mechanisms. Data-Driven Multithreading is a non-blocking multithreading model based on the Decoupled Data-Driven model of execution. This model decouples the synchronization from the computation portions of a program allowing them to execute asynchronously. In this model a thread is scheduled for execution in a dataflow manner, i.e., whenever all of its required data have been produced. As a consequence, no synchronization or communication latencies are experienced. We have demonstrated that DDM can be implemented with regular off-the-shelf microprocessors. Therefore it has the obvious benefit that a system may combine both DDM and the latest microprocessor technology. The core of the DDM implementation is the Thread Synchronization Unit (TSU). TSU is a memory-mapped device attached directly to the processor's bus and provides data-driven thread scheduling to the conventional microprocessor. Data-Driven perfecting improves drastically the hit ratio of the cache and at the same time requires much smaller cache memories. Thus, limiting the power consumption, and reducing further the effect of long memory latencies. Simulation experiments have shown that DDM achieves very respectable speedups.Bio:Skevos Evripidou is a Professor at the department of Computer Science at the University of Cyprus. From 1990 to 1994 he was on the Faculty of the department of Computer Science and Engineering at the Southern Methodist University. He received his Phd in Computer engineering from the University of Southern California in 1990. His current research interests are in Parallel Processing, Computer Architecture, Pervasive and Mobile computing. Dr Evripidou has participated in several projects funded by the European Union, the USA (NSF, DARPA, and DOE) and the Cyprus Research Promotion Foundation. He is a member of the IFIP Working Group 10.3, the IEEE Computer Society and ACM SIGARCH. He is also a member of the Phi Kappa Phi and Tau Beta Pi honor societies. Host: Prof. Viktor Prasanna, prasanna@usc.edu
Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248
Audiences: Everyone Is Invited
Contact: Rosine Sarafian
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WiSE Postdoctoral Association
Fri, Mar 09, 2007 @ 12:00 PM - 01:30 PM
Viterbi School of Engineering Student Affairs
Workshops & Infosessions
A group of post-docs has formed a cross-disciplinary group targeted at Women in Science and Engineering Post-docs. The goal is to provide networking, career, and social opportunities (for example, how to prepare for the academic job market, etc.) for women post-docs at USC.The group meets on the second Friday of each month. In addition to its usual lunch and networking, the March meeting will feature a discussion of the book "Women Don't Ask" by Linda Babcock and Susan Laschever (http://www.womendontask.com). For more information contact wisepostdoc@gmail.com
Location: Seeley G. Mudd Building (SGM) - 414
Audiences: Postdoctoral Fellows in Science and Engineering
Contact: Nicole Hawkes
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DURABILITY OF LOW-EMISSIONS SMALL OFF-ROAD ENGINES
Fri, Mar 09, 2007 @ 01:00 PM - 02:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Hung-Li Chang, Ph.D.
California Environmental Protection Agency, Air Resources BoardThe purpose of this study was to determine whether catalyst technology could be applied to small off-road engines to provide 50% or greater reductions in hydrocarbons plus oxides of nitrogen (HC+NOx) emissions throughout the engines' useful lives. Low-emission engines were developed using three-way catalytic converters, passive secondary-air induction systems. Catalysts were integrated into the engine's mufflers, where feasible, to maintain a compact package. To enable HC oxidation under such rich conditions, a simple passive supplemental air induction system was developed. The main conclusions of this work are that catalyst technology can be successfully applied to small off-road engines; that such applications are durable; and that HC+NOx reductions of 50 – 70% were demonstrated over the useful lives of several small engines. The results of this program are significant because they show good catalyst performance can be achieved on small engines using the stock rich air/fuel calibration through the use of a novel supplementary air induction system.Location: Kaprielian Hall (KAP) - 156
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Honors Colloquium: Laser-Based Imaging of Combustion Processes in the Next Generation of Engines
Fri, Mar 09, 2007 @ 01:00 PM - 02:00 PM
Viterbi School of Engineering Student Affairs
Conferences, Lectures, & Seminars
Lecture offered by Mr. Mark Musculus of Sandia National Laboratories.
Location: Olin Hall of Engineering (OHE) - 122
Audiences: Faculty and Honors Program Students
Contact: Erika Chua
