The goal of workload modeling is to predict a computer's workload well enough to design it correctly. A poor model will lead to degraded performance and user satisfaction. Analyzing logs from multiple real parallel computers uncovers several statistical features - locality of sampling, daily cycles, weekly cycles, self similarity and flurries - that are missing from current workload models. Their practical importance is demonstrated by two new kinds of scheduling algorithms - adaptive scheduling and shortest job backfill first scheduling - which achieve an average 10% bottom-line performance gain and 35% stability gain on the production workloads.The second part of this book presents a user based workload model. It identifies four stable user types and five stable session types. It then deduces model parameters, the distributions of the arrival and activity patterns for both users and sessions, their dependencies and temporal structure. The methodology and statistical toolset is explained to make it easier to reuse in other domains.The insights and practical advice provided will be of use to anyone building or operating a large-scale parallel computer.
The goal of workload modeling is to predict a computer's workload well enough to design it correctly. A poor model will lead to degraded performance and user satisfaction. Analyzing logs from multiple real parallel computers uncovers several statistical features - locality of sampling, daily cycles, weekly cycles, self similarity and flurries - that are missing from current workload models. Their practical importance is demonstrated by two new kinds of scheduling algorithms - adaptive scheduling and shortest job backfill first scheduling - which achieve an average 10% bottom-line performance gain and 35% stability gain on the production workloads.The second part of this book presents a user based workload model. It identifies four stable user types and five stable session types. It then deduces model parameters, the distributions of the arrival and activity patterns for both users and sessions, their dependencies and temporal structure. The methodology and statistical toolset is explained to make it easier to reuse in other domains.The insights and practical advice provided will be of use to anyone building or operating a large-scale parallel computer.
The 33 revised full papers and 30 poster summaries presented together with papers of 12 selected doctoral consortium articles and the abstracts of 3 invited lectures were carefully reviewed and...
This book constitutes selected papers from the lectures given at the workshops held in conjunction with the User Modeling, Adaptation and Personalization Conference, UMAP 2011, Girona, Spain, in July...
Daily life relies more and more on safety critical systems, e.g. in areas such as power plant control, traffic management, flight control, and many more. MOVEP is a school devoted to the broad...
Parallel Algorithms for Linear Models provides a complete and detailed account of the design, analysis and implementation of parallel algorithms for solving large-scale linear models. It ...
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