https://kanzhu.netlify.app/project/ProjectsWowchemy (https://wowchemy.com)en-usSun, 20 Nov 2022 00:00:00 +0000https://kanzhu.netlify.app/media/icon_hu0b7a4cb9992c9ac0e91bd28ffd38dd00_9727_512x512_fill_lanczos_center_3.pnghttps://kanzhu.netlify.app/project/https://kanzhu.netlify.app/project/uop/Sun, 20 Nov 2022 00:00:00 +0000https://kanzhu.netlify.app/project/uop/https://kanzhu.netlify.app/project/gdata/Thu, 20 Oct 2022 00:00:00 +0000https://kanzhu.netlify.app/project/gdata/<!-- Modern web services are pervasive, running across hundreds of thousands of servers in data centers. Hence, even a small improvement in server efficiency can achieve significant financial and environmental benefits. Improving server efficiency requires a comprehensive study of production web services’ micro-architectural behaviors. To this end, we design Ally, a simulation and characterization infrastructure that enables studying production web services’ microarchitectural behaviors using recently-released traces of widely-used production Google applications. We identify and mitigate unique challenges in enabling micro-architectural simulations of these traces via novel techniques introduced by Ally. Apart from enabling meaningful research on improving micro-architectural performance, Ally identifies open-source applications that represent production behaviors. Based on the simulation and characterization Ally enables, we determine key micro-architectural performance bottlenecks faced by production services, identifying several future optimization opportunities. As examples, we identify that processors must (1) handle massive thread oversubscription and (2) utilize available bandwidth to manage large instruction and data footprints. Based on our case studies of microarchitectural optimizations, we evaluate context-driven thread scheduling and bandwidth-aware hardware prefetching to eliminate 5% and 28% of cache misses faced by these services. Ally also motivates other future research directions, such as reducing the warm-up time for predictors and caches. -->https://kanzhu.netlify.app/project/out-of-ordercpu/Sat, 30 Apr 2022 00:00:00 +0000https://kanzhu.netlify.app/project/out-of-ordercpu/