13647

12410

كارشناسي ارشد

معماري سيستم هاي كامپيوتري

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

۱۳۹۷

سيزده، [۷۹]ص.: مصور، جدول، نمودار

مجيد نبي

انگليسي به فارسي

علي فانيان، مهران صفاياني

1397/04/11

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID12410

Enhancing the Performance of Multiple Network on Chip Catnap with Using Subnet Switching Capabilitiy for Control Packets Rashid Aligholipour r aligholipour@ec iut ac ir Data of Submission 2018 05 23 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran 84156 83111Degree Master of Science Language PersianSupervisor Dr Majid Nabi nabi@cc iut ac irAbstractNetwork on Chip NoC is an efficient and scalable communication mechanism for integrated circuitchips containing a large number of processing cores With increasing the number of cores in a chip the number of NOC routers needs to be increased as well Since these routers are typically complexand energy hungry the chip s power consumption dramatically increases by increasing the numberof core thus the number of routers On the other hand the static power consumption of the NOCsis increasing day by day due to the technology advancements in reducing transistors dimensions andlowering the operating voltage of the transistors Nowadays around half of the NOC powerconsumption is due to the static power Moreover increase in static power consumption makes thechip warmer leading to even higher power consumption Therefore a static power consumptionreduction technique is of paramount importance for NOCs One of the most effective techniques forreducing the static power consumption on a chip is power gating By turning off the idle networkrouters in a NOC a major part of leakage current in routers is avoided However applying the powergating technique to the routers of a NOC strongly increases the latency of the packets since they needthe routers in the path to turn on This operation results in a sharp drop in the performance of thechip Since the performance of the NOC has a huge impact on the overall performance of the chip an appropriate balance between the power consumption of the chip and its performance is needed Inthis research we propose a technique called ChangeSUB which is an extension to multi NOCs catnap In this method the control packets are able to change a non zero subnet to a zero subnet ina multi NOC if there is a virtual channel available in the router of the zero subnet Because all thezero zubnets are always on the packets can get forwarded through the zero subnet routers withoutwaiting for them to turn on It effectively reduces the average latency of packet delivery in the NOC Based on the results of the PARSEC benchmark the average latency of packets decreased by 3 03 compared to the base multi NOC technique Along with this improvement 2 1 of the area overheadis imposed Keywords Network on Chip Power Gating Static Power High Performance Computing

مجيد نبي

علي فانيان، مهران صفاياني