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CHAPTER6Performance and Observability

There was a time when system administrators and IT architects were concerned about the raw performance of servers having relatively few processors, little memory, and slow network and I/O connections, all supported by a single operating system (OS) running on “bare metal.” With today’s modern systems, however, featuring massive memories, hundreds of hardware threads (HWTs), and superfast I/O, one would think such concerns are fading. But because such systems are now typically partitioned into smaller subsystems using virtualization technologies, there is still a great need for understanding both total system ...

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