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Dive into the research topics where George Patsilaras is active.

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Featured researches published by George Patsilaras.


ACM Transactions on Architecture and Code Optimization | 2017

ReDirect: Reconfigurable Directories for Multicore Architectures

George Patsilaras; James Tuck

As we enter the dark silicon era, architects should not envision designs in which every transistor remains turned on permanently but rather ones in which portions of the chip are judiciously turned on/off depending on the characteristics of a workload. At the same time, due to the increasing cost per transistor, architects should also consider new ways to re-purpose transistors to increase their architectural value. In this work, we consider the design of directory-based cache coherence in light of the dark silicon era and the need to re-purpose transistors. We point out that directories are not needed all of the time, and we argue that directories (and coherence) should be off unless it is actually needed for correctness. In our design, directories will be disabled and powered off for workloads with no sharing. Then only when parallel workloads need cache coherence will directories be enabled in proportion to the sharing that is present. At the same time, we exploit the structural similarities of directories and cache. If a directory is idle, then we reconfigure it to be used as extra capacity in the last-level cache. Since our novel approach can keep most directories off, we are free to select sparse overprovisioned directory designs that are reconfigurable to large amounts of cache that can significantly boost performance when the directory is idle. We call these combined features Reconfigured Dark Directories, since directories are usually dark (off) and can be reconfigured. Our results for Reconfigurable Dark Directories running SPEC 2006 applications show a performance benefit, on average, of 17% for an 8× overprovisioned fully mapped directory on a 64-tile system under low system concurrency (10% under heavy concurrency), or a 29% average speedup for a 2× overprovisioned directory on 256-tile system (10% under heavy concurrency) to systems with a conventional sparse directory design using the same overprovisioning factor.


Archive | 2016

Power Aware Padding

George Patsilaras; Ali Iranli; Andrew Edmund Turner; Bohuslav Rychlik


Archive | 2016

Cache Line Compaction of Compressed Data Segments

Andrew Edmund Turner; George Patsilaras; Bohuslav Rychlik


Archive | 2016

BANDWIDTH/RESOURCE MANAGEMENT FOR MULTITHREADED PROCESSORS

Serag Gadelrab; Christopher Edward Koob; Simon Booth; Aris Balatsos; Johnny Jone Wai Kuan; Myil Ramkumar; Bhupinder Singh Pabla; Sean D. Sweeney; George Patsilaras


Archive | 2015

DISUNITED SHARED-INFORMATION AND PRIVATE-INFORMATION CACHES

George Patsilaras; Bohuslav Rychlik; Anwar Rohillah


Archive | 2015

Methods of Selecting Available Cache in Multiple Cluster System

Feng Wang; Bohuslav Rychlik; George Patsilaras; Andrew Edmund Turner; Anwar Rohillah


Archive | 2015

Cache bank spreading for compression algorithms

George Patsilaras; Andrew Edmund Turner; Bohuslav Rychlik


Archive | 2016

Method And Apparatus For A Shared Cache With Dynamic Partitioning

Subbarao Palacharla; Moinul Khan; Alain Artieri; Kedar Bhole; Vinod Chamarty; Yanru Li; Raghu Sankuratri; George Patsilaras; Pavan Kumar Thirunagari; Andrew Edward Turner; Jeong-ho Woo


Archive | 2015

METHOD AND APPARATUS FOR LOWERING BANDWIDTH AND POWER IN A CACHE USING READ WITH INVALIDATE

George Patsilaras; Moinul Khan; Pankaj Chaurasia; Bohuslav Rychlik; Feng Wang; Anwar Rohillah; Subbarao Palacharla


Archive | 2015

Process Scheduling to Improve Victim Cache Mode

Feng Wang; George Patsilaras

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