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"World-renowned software performance expert Richard Sites tackles the problem of time-constrained software head on, offering expert methods and advanced tools for understanding complex time-constrained software dynamics, improving software reliability, and troubleshooting challenging performance problems. He addresses CPU, memory, disk, network, and more, helping you fix programs that are always too slow, or work well at times but inexplicably slow down at other times. Sites draws on several decades of experience pioneering software performance optimization, and extensive experience teaching developers at the graduate level. He introduces principles and techniques you can use in any environment, from embedded devices to datacenters, illuminating them with examples based on x86 or ARM processors running Linux and linked by Ethernet. Sites also guides readers through building and applying a powerful new extremely-low-overhead open source software tool, KUtrace, to trace exactly what is executing on every CPU core. Using insights gleaned from this tool, readers can apply nuanced approaches to performance enhancement -- not merely brute-force techniques such as turning off caches or cores."

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This book describes warehouse-scale computers (WSCs), the computing platforms that power cloud computing and all the great web services we use every day. It discusses how these new systems treat the datacenter itself as one massive computer designed at warehouse scale, with hardware and software working in concert to deliver good levels of internet service performance. The book details the architecture of WSCs and covers the main factors influencing their design, operation, and cost structure, and the characteristics of their software base. Each chapter contains multiple real-world examples, including detailed case studies and previously unpublished details of the infrastructure used to power Google's online services. Targeted at the architects and programmers of today's WSCs, this book provides a great foundation for those looking to innovate in this fascinating and important area, but the material will also be broadly interesting to those who just want to understand the infrastructure powering the internet. The third edition reflects four years of advancements since the previous edition and nearly doubles the number of pictures and figures. New topics range from additional workloads like video streaming, machine learning, and public cloud to specialized silicon accelerators, storage and network building blocks, and a revised discussion of data center power and cooling, and uptime. Further discussions of emerging trends and opportunities ensure that this revised edition will remain an essential resource for educators and professionals working on the next generation of WSCs.

Web servers --- Cloud computing. --- Computer organization. --- Data libraries. --- data centers --- cloud computing --- servers --- hyperscale systems --- hardware accelerators --- Internet services --- distributed systems --- energy efficiency --- fault-tolerant computing --- cluster computing --- computer organization --- computer design --- Design.