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Task migration optimization for improved dark silicon many-core systems performance under thermal constraint

Contemporary thermally-constrained techniques for optimizing dark silicon many-core system performance do not use dynamic thermal management efficiently and do not consider the wake-up latency of dark cores. This thesis proposes two improved techniques to overcome these limitations. First is a dynam...

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Main Author: Mohammed, Mohammed Sultan Ahmed
Format: Thesis
Language:English
Published: 2022
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://eprints.utm.my/id/eprint/102080/1/MohammedSultanAhmedPSKE2022.pdf
http://eprints.utm.my/id/eprint/102080/
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spelling my.utm.1020802023-08-05T02:25:59Z http://eprints.utm.my/id/eprint/102080/ Task migration optimization for improved dark silicon many-core systems performance under thermal constraint Mohammed, Mohammed Sultan Ahmed TK Electrical engineering. Electronics Nuclear engineering Contemporary thermally-constrained techniques for optimizing dark silicon many-core system performance do not use dynamic thermal management efficiently and do not consider the wake-up latency of dark cores. This thesis proposes two improved techniques to overcome these limitations. First is a dynamic thermal-aware performance optimization (DTaPO) technique for dark silicon many-core systems. DTaPO optimizes dark silicon many-core system performance under thermal constraint. The proposed technique utilizes both task migration and dynamic voltage frequency scaling (DVFS) to optimize the performance of a many-core system while keeping the system temperature at a safe operating limit. Task migration puts hot cores in lowpower states and moves tasks to cool dark cores to aggressively reduce chip temperature while maintaining high overall system performance. To reduce task migration cold start overhead during task migration, source cores keep their level-2 cache content accessible to the destination cores. Moreover, task migration is limited among cores sharing the last level cache. In the case where task migration cannot be used due to no cool dark core destinations being available, DVFS is used to gradually cool the hot cores by reducing their frequency. Second, a prediction-based early wake-up (PEW) technique for dark cores is proposed to reduce the impact of dark core wake-up latency during the task migration process. An online sliding window-based ridge regression is used as the prediction model. In real-time, the prediction model uses the previous thermal, power, and core status (i.e., active or dark) to predict the subsequent temperature of each core . If task migration is expected to be used in the next control period, PEW puts the dark cores in a power state with low wake-up latency. Thus, it reduces the time needed by the dark cores to start running the migrating tasks, which improves the many-core system’s overall performance. Experimental results show that DTaPO improves the system’s performance by up to 80% compared to the Optimal Sprinting Patterns technique and reduces the temperature by up to 13.6 °C. Moreover, the comparison results show that the proposed PEW reduces the application execution time by up to 7.9% and 4.1% compared to DTaPO and the fixed-threshold wake-up (FEW) technique, respectively. It also shows that the proposed PEW increases the energy-efficiency by up to 5.5% and 2.3% MIPS/W over DTaPO and FEW, respectively. 2022 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/102080/1/MohammedSultanAhmedPSKE2022.pdf Mohammed, Mohammed Sultan Ahmed (2022) Task migration optimization for improved dark silicon many-core systems performance under thermal constraint. PhD thesis, Universiti Teknologi Malaysia, Faculty of Engineering - School of Electrical Engineering. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:149121
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TK Electrical engineering. Electronics Nuclear engineering
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Mohammed, Mohammed Sultan Ahmed
Task migration optimization for improved dark silicon many-core systems performance under thermal constraint
description Contemporary thermally-constrained techniques for optimizing dark silicon many-core system performance do not use dynamic thermal management efficiently and do not consider the wake-up latency of dark cores. This thesis proposes two improved techniques to overcome these limitations. First is a dynamic thermal-aware performance optimization (DTaPO) technique for dark silicon many-core systems. DTaPO optimizes dark silicon many-core system performance under thermal constraint. The proposed technique utilizes both task migration and dynamic voltage frequency scaling (DVFS) to optimize the performance of a many-core system while keeping the system temperature at a safe operating limit. Task migration puts hot cores in lowpower states and moves tasks to cool dark cores to aggressively reduce chip temperature while maintaining high overall system performance. To reduce task migration cold start overhead during task migration, source cores keep their level-2 cache content accessible to the destination cores. Moreover, task migration is limited among cores sharing the last level cache. In the case where task migration cannot be used due to no cool dark core destinations being available, DVFS is used to gradually cool the hot cores by reducing their frequency. Second, a prediction-based early wake-up (PEW) technique for dark cores is proposed to reduce the impact of dark core wake-up latency during the task migration process. An online sliding window-based ridge regression is used as the prediction model. In real-time, the prediction model uses the previous thermal, power, and core status (i.e., active or dark) to predict the subsequent temperature of each core . If task migration is expected to be used in the next control period, PEW puts the dark cores in a power state with low wake-up latency. Thus, it reduces the time needed by the dark cores to start running the migrating tasks, which improves the many-core system’s overall performance. Experimental results show that DTaPO improves the system’s performance by up to 80% compared to the Optimal Sprinting Patterns technique and reduces the temperature by up to 13.6 °C. Moreover, the comparison results show that the proposed PEW reduces the application execution time by up to 7.9% and 4.1% compared to DTaPO and the fixed-threshold wake-up (FEW) technique, respectively. It also shows that the proposed PEW increases the energy-efficiency by up to 5.5% and 2.3% MIPS/W over DTaPO and FEW, respectively.
format Thesis
author Mohammed, Mohammed Sultan Ahmed
author_facet Mohammed, Mohammed Sultan Ahmed
author_sort Mohammed, Mohammed Sultan Ahmed
title Task migration optimization for improved dark silicon many-core systems performance under thermal constraint
title_short Task migration optimization for improved dark silicon many-core systems performance under thermal constraint
title_full Task migration optimization for improved dark silicon many-core systems performance under thermal constraint
title_fullStr Task migration optimization for improved dark silicon many-core systems performance under thermal constraint
title_full_unstemmed Task migration optimization for improved dark silicon many-core systems performance under thermal constraint
title_sort task migration optimization for improved dark silicon many-core systems performance under thermal constraint
publishDate 2022
url http://eprints.utm.my/id/eprint/102080/1/MohammedSultanAhmedPSKE2022.pdf
http://eprints.utm.my/id/eprint/102080/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:149121
_version_ 1773543501905002496
score 13.211869

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