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• System Diagnosis Tools

  To check on the health of a Linux system, administrators can turn to vmstat, iostat, netstat, and ifstat. Or, you can just use the versatile dstat, which combines the features of several tools in a single package.

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• OOM Killer

  When a Linux system runs out of memory, a special agent, the out-of-memory killer, rushes to its aid. Facebook has now introduced its own OOM killer. What makes it different from its kernel-based counterpart? And what is an OOM killer really?

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• Command Line – Probing /proc

  The mysterious /proc virtual filesystem is a rich mine of information about everything in your system.

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• Optimizing Linux Performance

  When you're tuning up Linux performance, you need to keep an eye on a number of components and parameters. This article describes some techniques for optimizing performance by tuning TCP/IP, reducing latency, and configuring NUMA-aware systems. You'll also learn about CPU scheduling and memory management tuning.

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• Load Average

  What is the real meaning of those little “load average” values in the output of shell commands like procinfo and uptime, and what can you do with these numbers?

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