Download Performance Tuning for Linux Servers by Sandra K. Johnson PDF

By Sandra K. Johnson

Confirmed strategies for optimizing net, dossier, print, database, and alertness servers functional introductions to open resource functionality administration instruments Easy-to-understand examples in keeping with pink Hat firm Linux and Novell SUSE Linux firm ServerAn necessary advisor to maximizing Linux procedure and alertness performanceFrom Wall highway to Hollywood, Linux runs a few of the world's so much businesscritical platforms. Linux functionality now affects the whole firm. In functionality Tuning for Linux Servers, a staff of IBM's most-experienced Linux functionality experts indicates you the way to discover bottlenecks, degree functionality, and establish powerful optimizations.This e-book does not simply disguise kernel tuning: it indicates the way to maximize the end-to-end functionality of real-world purposes and databases working on Linux. all through, the authors current life like examples in accordance with latest preferred firm Linux structures, Intel-based crimson Hat company Linux, and Novell SUSE Linux firm Server. those examples are designed for simplicity, readability, and simple version to any modern Linux setting. you will find how you can set up and configure Linux for optimum functionality from the outset overview and select the fitting structure on your Linux atmosphere comprehend Linux kernels 2.4 via 2.6: parts, functionality concerns, and optimization possibilities grasp center Linux functionality tuning rules and methods make the most of unfastened, open resource instruments for dimension, tracking, approach tracing, and benchmarking Interpret functionality info to investigate your Linux server's real-world habit Optimize Linux approach schedulers, reminiscence, I/O, dossier platforms, and networking music net, dossier, database, and alertness servers working advertisement workloads are expecting the influence of alterations in tuning parameters or configurations music Linux code: optimize layout, timing, sockets, threads, synchronization, and extra Architect for max functionality: SMP scaling, clustering, and topology combine kernel and alertness tuning in end-to-end process optimization projectsWhether you are an administrator, developer, integrator, or advisor, functionality Tuning for Linux Serverswill assist you maximize the functionality and cost of each Linux method and alertness you run.

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Sample text

Both of these approaches have a common basis in that they eliminate a shared system bus. A cluster is constructed of a collection of self-contained systems that are interconnected and have a central control point that manages the work that each system (node) within a cluster is performing. Each node within a cluster runs its own operating system (that is, Linux) and only has direct access to its own memory. NUMA systems, on the other hand, are constructed from nodes connected through a high-speed interconnect, but a common address space is shared across all nodes.

UNIX-like operating systems hide all the low-level hardware details from an application. If an application wants to make use of a hardware resource, it must make a request to the operating system. The operating system then evaluates the request and interacts with the hardware component on behalf of the application, but only if it's valid. To enforce this kind of scheme, the operating system needs to depend on hardware capabilities that forbid applications to directly interact with them. Organization and Modules Like many other UNIX-like operating systems, the Linux kernel is monolithic.

Paging Virtual memory is implemented in many ways, but the most effective way is hardware-based. Virtual address space is divided into fixed-size chunks called pages. Virtual memory references are translated into addresses in physical memory using page tables. To support various architectures and page sizes, Linux uses a three-level paging mechanism. The three types of page tables are as follows: • Page Global Directory (PGD) • Page Middle Directory (PMD) • Page Table (PTE) Address translation provides a way to separate the virtual address space of a process from the physical address space.

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