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Linux

Performance Tools for Optimizing Linux: Process-Specific CPU

Post date: June 1, 2005, 07:06 Category: Optimizing Views: 3861 Comments
Tutorial quote: The tools to analyze the performance of applications are varied and have existed in one form or another since the early days of UNIX. It is critical to understand how an application is interacting with the operating system, CPU, and memory system to understand its performance. This chapter will help you understand where the bottleneck in your system is occuring, and how to fix it.
Linux

Grub From the Ground Up

Post date: April 12, 2005, 17:04 Category: Software Views: 3410 Comments
Tutorial quote: Grub is a world-class boot loader with insufficient documentation. In many ways it blows the doors of LILO. For instance, it's MUCH easier to use Knoppix to rebuild a grub boot loader than to rebuild a LILO boot loader. However, until you're comfortable with grub, it might seem just the opposite. All too often grub dumps you at a grub> prompt with no hint of what you should do. You might have heard that a successful reboot is just three commands away, but which commands? The state of grub's documentation is such that you can't figure it out unless you already know grub.

That catch 22 is the very purpose of this document. This document will to give you enough grub expertise that you can create a grub boot floppy on a working machine with grub installed (not necessarily as the bootloader, just installed), and use that floppy to bust back into a Linux machine with a blown bootloader, and then use that floppy to actually install grub as the bootloader.

This document does not discuss using grub to boot or dual boot Windows, mach, BSD, or other non-Linux operating systems. I might write on that subject later. But in the meantime, once you're familiar with the principles and practices of grub, given some study of existing documentation you'll probably be able to use grub to boot non-Linux operating systems.
CentOS

How To Monitor A System With Sysstat On Centos 4.3

Post date: August 29, 2006, 15:08 Category: System Views: 6917 Comments
Tutorial quote: A common task for System Administrators is to monitor and care for a server. That's fairly easy to do at a moment's notice, but how to keep a record of this information over time? One way to monitor your server is to use the Sysstat package.

Sysstat is actually a collection of utilities designed to collect information about the performance of a linux installation, and record them over time.

It's fairly easy to install too, since it is included as a package on many distributions.
Unix+clones

How To Look Like A UNIX Guru

Post date: October 30, 2006, 02:10 Category: Miscellaneous Views: 6404 Comments
Tutorial quote: UNIX is an extremely popular platform for deploying server software partly because of its security and stability, but also because it has a rich set of command line and scripting tools. Programmers use these tools for manipulating the file system, processing log files, and generally automating as much as possible.

If you want to be a serious server developer, you will need to have a certain facility with a number of UNIX tools; about 15. You will start to see similarities among them, particularly regular expressions, and soon you will feel very comfortable. Combining the simple commands, you can build very powerful tools very quickly--much faster than you could build the equivalent functionality in C or Java, for example.

This lecture takes you through the basic commands and then shows you how to combine them in simple patterns or idioms to provide sophisticated functionality like histogramming. This lecture assumes you know what a shell is and that you have some basic familiarity with UNIX.
Unix+clones

Optimizing C/C++ programs using the GProf profiler

Post date: May 24, 2005, 18:05 Category: Optimizing Views: 7963 Comments
Tutorial quote: One of the most important things to keep in mind while optimizing an application is: optimize where it counts. It is no use to spend hours optimizing a piece of code that usually runs for only 0.04 seconds anyway.

GProf provides a surprisingly easy way to profile your C/C++ application and spot the interesting pieces right away. A small case study shows how GProf was used to reduce the running time of a real-world application from over 3 minutes to under 5 seconds, by identifying 2 data structures as important and optimizing those.

Historically, the program goes back as far as 1982, when it was introduced on the the SIGPLAN Symposium on Compiler Construction. It is now a standard tool available on virtually all flavors of UNIX.
Unix+clones

Wikipedia Content on Dict

Post date: December 31, 2005, 19:12 Category: Network Views: 3428 Comments
Tutorial quote: Dict is a dictionary client program that retrieves information from dictd servers hosted locally or from many free dictd servers on Internet.Though originally designed for online dictionary networks, it can be used to get other information like wildly popular wikipedia servers.
OpenSUSE

Baobab - Disk Analysis tool in openSUSE (GNOME/KDE4)

Post date: November 11, 2008, 22:11 Category: Hardware Views: 6836 Comments
Tutorial quote: Baobab is a C/gtk+ application to analyse disk usage in any Gnome environment. Baobab can easily scan either the whole filesystem tree, or a specific user-requested directory branch either on the local system or on a remote system.
Debian

Debian Network Utilities and tools With Examples

Post date: September 18, 2006, 16:09 Category: Network Views: 5431 Comments
Tutorial quote: This is the list of debian network utilities and tools for administrators and users to check the network related traffic, monitor network.This includes installation of each package with man pages
Debian

Centralized Syslog Server Using syslog-NG

Post date: April 28, 2006, 15:04 Category: System Views: 4514 Comments
Tutorial quote: syslog-ngĀ© is the world's most flexible and scalable audit trail processing tool for organizations of any size. It provides a centralised, securely stored log of all devices on your network, whatever platform they run on. And syslog-ng also incorporates a host of powerful features, including filtering based on message content, as well as customisable data mining and analysis capabilities.

Linux

Editing Images With Pinta

Post date: October 11, 2011, 07:10 Category: Desktop Views: 5227 Comments
Tutorial quote: This article is about how to use the Pinta graphical editor to edit pictures and covers some of its most important features. Pinta is a lightweight image editor for Linux and is far more easier to handle than Gimp but still has a large variety of tools and features to use. It can be used for quick editing like resizing images or adjusting the colours of photographs, but also for more professional tasks which depend on layered images and more. It is a good mixture between MS Paint and professional image editing tools and is recommendable for most purposes of image-editing-everyday-use.
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