2009 10th International Conference on Ultimate Integration of Silicon, 2009
... Email: stefan.flachowsky@et.htw-dresden.de; Phone: +49 351 4623428 Biaxial tensile strained s... more ... Email: stefan.flachowsky@et.htw-dresden.de; Phone: +49 351 4623428 Biaxial tensile strained substrates offer strong electron mobility enhancements resulting in large drive current gains. For short channel n-MOSFETs, however, these improvements diminish. ...
IEEE International. 2005 Proceedings of the IEEE Workload Characterization Symposium, 2005., 2005
Abstract The comparison and alignment of DNA and protein sequences are important tasks in molecu... more Abstract The comparison and alignment of DNA and protein sequences are important tasks in molecular biology and bioin-formatics. One of the most well known algorithms to perform the string-matching operation present in these tasks is the Smith-Waterman algorithm (SW). ...
2013 IEEE International Symposium on Performance Analysis of Systems and Software (ISPASS), 2013
ABSTRACT As of June 2012, 41 % of all systems in the TOP5OO use Gigabit Ethernet. Ethernet has be... more ABSTRACT As of June 2012, 41 % of all systems in the TOP5OO use Gigabit Ethernet. Ethernet has been a strong contender in the HPC interconnect market for its competitive performance and low cost. However, until recently, little emphasis has been thrown upon bringing about energy efficient HPC interconnects. To illustrate, in a majority if not all Ethernet based systems, the transmitter and receiver operate at full power regardless of any data transmission between them, leading to power inefficiency. The recent standard IEEE 802.3az, Energy Efficient Ethernet (EEE), approved in 2010, solves the above conundrum by introducing "Low-Power-Idle", dynamically turning off unused links to save interconnect power. In this paper, we present the first analysis of Energy Efficient Ethernet in the domain of HPC, examining its potential for power savings. Unlike previous proposals, we present a detailed analysis of the impact of additional latency overhead introduced by EEE, using multiple simulated systems running actual HPC application traces. We propose the use of "Power-Down Threshold", as a possible add-on to EEE to mitigate its on/off transition overhead. We find that EEE brings about link power savings of about 70% by switching off links, but at the cost of performance, leading to increased power consumption of the overall system by l5% (average). In contrast, using our proposed "Power-Down Threshold", we demonstrate reduced on/off transition overhead, from 25% to 2%, translating to overall system power savings of about 7.5%. Furthermore, in this work we point out relevant design decisions for future vendors intending to deploy EEE solutions for their HPC systems.
International Journal of High Performance Computing and Networking, 2004
... de Gran Canaria, Spain, in 1999, and the MS degree in Computer Science from the same Universi... more ... de Gran Canaria, Spain, in 1999, and the MS degree in Computer Science from the same University in 2001. He is currently a PhD candidate of the Polytechnic University of Catalonia. His research area focuses in instruction fetch policies for SMT architectures. Alex Ramirez ...
International Journal of High Performance Computing and Networking, 2004
... He has a PhD in Computer Science from UPC, as well as a BS and an MS in Computer Science from... more ... He has a PhD in Computer Science from UPC, as well as a BS and an MS in Computer Science from the University of Las Palmas de Gran Canaria (ULPGC). Alex Ramirez obtained his Computer Science degree from the Polytechnic University of Catalonia (UPC) in 1997 and ...
2009 10th International Conference on Ultimate Integration of Silicon, 2009
... Email: stefan.flachowsky@et.htw-dresden.de; Phone: +49 351 4623428 Biaxial tensile strained s... more ... Email: stefan.flachowsky@et.htw-dresden.de; Phone: +49 351 4623428 Biaxial tensile strained substrates offer strong electron mobility enhancements resulting in large drive current gains. For short channel n-MOSFETs, however, these improvements diminish. ...
IEEE International. 2005 Proceedings of the IEEE Workload Characterization Symposium, 2005., 2005
Abstract The comparison and alignment of DNA and protein sequences are important tasks in molecu... more Abstract The comparison and alignment of DNA and protein sequences are important tasks in molecular biology and bioin-formatics. One of the most well known algorithms to perform the string-matching operation present in these tasks is the Smith-Waterman algorithm (SW). ...
2013 IEEE International Symposium on Performance Analysis of Systems and Software (ISPASS), 2013
ABSTRACT As of June 2012, 41 % of all systems in the TOP5OO use Gigabit Ethernet. Ethernet has be... more ABSTRACT As of June 2012, 41 % of all systems in the TOP5OO use Gigabit Ethernet. Ethernet has been a strong contender in the HPC interconnect market for its competitive performance and low cost. However, until recently, little emphasis has been thrown upon bringing about energy efficient HPC interconnects. To illustrate, in a majority if not all Ethernet based systems, the transmitter and receiver operate at full power regardless of any data transmission between them, leading to power inefficiency. The recent standard IEEE 802.3az, Energy Efficient Ethernet (EEE), approved in 2010, solves the above conundrum by introducing "Low-Power-Idle", dynamically turning off unused links to save interconnect power. In this paper, we present the first analysis of Energy Efficient Ethernet in the domain of HPC, examining its potential for power savings. Unlike previous proposals, we present a detailed analysis of the impact of additional latency overhead introduced by EEE, using multiple simulated systems running actual HPC application traces. We propose the use of "Power-Down Threshold", as a possible add-on to EEE to mitigate its on/off transition overhead. We find that EEE brings about link power savings of about 70% by switching off links, but at the cost of performance, leading to increased power consumption of the overall system by l5% (average). In contrast, using our proposed "Power-Down Threshold", we demonstrate reduced on/off transition overhead, from 25% to 2%, translating to overall system power savings of about 7.5%. Furthermore, in this work we point out relevant design decisions for future vendors intending to deploy EEE solutions for their HPC systems.
International Journal of High Performance Computing and Networking, 2004
... de Gran Canaria, Spain, in 1999, and the MS degree in Computer Science from the same Universi... more ... de Gran Canaria, Spain, in 1999, and the MS degree in Computer Science from the same University in 2001. He is currently a PhD candidate of the Polytechnic University of Catalonia. His research area focuses in instruction fetch policies for SMT architectures. Alex Ramirez ...
International Journal of High Performance Computing and Networking, 2004
... He has a PhD in Computer Science from UPC, as well as a BS and an MS in Computer Science from... more ... He has a PhD in Computer Science from UPC, as well as a BS and an MS in Computer Science from the University of Las Palmas de Gran Canaria (ULPGC). Alex Ramirez obtained his Computer Science degree from the Polytechnic University of Catalonia (UPC) in 1997 and ...
Uploads