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Unix+clones

Optimizing C/C++ programs using the GProf profiler

Post date: May 24, 2005, 18:05 Category: Optimizing Views: 7695 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.
Ubuntu

How To Make An Ubuntu 10.10 Desktop Resemble A Mac (With Elementary, Docky & Gloobus-Preview)

Post date: October 27, 2010, 11:10 Category: Desktop Views: 4533 Comments
Tutorial quote: This article shows how you can change the appearance of your Ubuntu 10.10 desktop so that it resembles a Mac. This can be achieved with the help of Elementary, Docky, and Gloobus-Preview. Elementary is a project that provides a popular icon set and GTK theme; Docky is an interactive dock (like the one you know from a Mac) that provides easy access to some of the files, folders, and applications on your computer, and more; and Gloobus-Preview is an extension for the Gnome Desktop Environment designed to enable a full screen preview of any kind of file or directory.
Ubuntu

How To Make An Ubuntu 10.04 Desktop Resemble A Mac (With Elementary, Docky & Gloobus-Preview)

Post date: July 13, 2010, 11:07 Category: Desktop Views: 4144 Comments
Tutorial quote: This article shows how you can change the appearance of your Ubuntu 10.04 desktop so that it resembles a Mac. This can be achieved with the help of Elementary, Docky, and Gloobus-Preview. Elementary is a project that provides a popular icon set and GTK theme; Docky is an interactive dock (like the one you know from a Mac) that provides easy access to some of the files, folders, and applications on your computer, and more; and Gloobus-Preview is an extension for the Gnome Desktop Environment designed to enable a full screen preview of any kind of file or directory.
CentOS

How To Install Qmailtoaster (CentOS 5.3)

Post date: June 19, 2009, 10:06 Category: Installing Views: 8154 Comments
Tutorial quote: Qmailtoaster is a project that aims to make the installation of Qmail onto RPM based systems a snap. All of the packages are distributed in source RPMs so building the packages for your particular distro and architecture is as easy as running a script or a simple command for each package. The RPMs have all of the needed and commonly asked for patches included so you can have a mail server up and running in about an hour. When it's all complete, you'll have a full Qmail mail server installation ready for just about anything. I personally run Qmailtoaster servers for other companies and ISPs who have tens of thousands of users on their systems.
Linux

How to install Linux on Windows using VirtualBox

Post date: August 12, 2008, 14:08 Category: Installing Views: 3684 Comments
Tutorial quote: This guide explains how to install Linux and specifically Ubuntu Linux on Windows XP using SUN's VirtualBox. VirtualBox creates a virtual hard drive in which you can install another guest Operating System (Ubuntu Linux) which you can run along with your host Operating System (Windows XP). This way you can try Linux without being afraid of losing your Windows files.
RedHat

Choosing an I/O Scheduler for Red Hat Enterprise Linux 4

Post date: July 18, 2005, 22:07 Category: Benchmarks Views: 8411 Comments
Tutorial quote: The Linux kernel, the core of the operating system, is responsible for controlling disk access by using kernel I/O scheduling. Red Hat Enterprise Linux 3 with a 2.4 kernel base uses a single, robust, general purpose I/O elevator. The 2.4 I/O scheduler has a reasonable number of tuning options by controlling the amount of time a request remains in an I/O queue before being serviced using the elvtune command. While Red Hat Enterprise Linux 3 offers most workloads excellent performance, it does not always provide the best I/O characteristics for the wide range of applications in use by Linux users these days. The I/O schedulers provided in Red Hat Enterprise Linux 4, embedded in the 2.6 kernel, have advanced the I/O capabilities of Linux significantly. With Red Hat Enterprise Linux 4, applications can now optimize the kernel I/O at boot time, by selecting one of four different I/O schedulers.
Linux

Optimizing Linux filesystems

Post date: April 12, 2005, 07:04 Category: Benchmarks Views: 4115 Comments
Tutorial quote: Last time we introduced a few common Linux filesystems and examined their features. If you've already installed Linux, your partitions are already set up and configured with particular filesystems, but you may decide you want to modify this configuration. What's the best way to begin?
Linux

Penguin Pete's X Window Manager and Desktop Environment Guide

Post date: January 6, 2007, 22:01 Category: Desktop Views: 3073 Comments
Tutorial quote: A tour of the desktops you will encounter on 99% of the Linux distributions out there. Each with screen shots, a review, and links. Written to help the new Linux user get familiar with the Linux desktop scene and help them decide which one is right for them.
Solaris

Installing Solaris using JumpStart technology on an Intel laptop

Post date: April 13, 2005, 05:04 Category: Installing Views: 4446 Comments
Tutorial quote: An interesting use of Solaris 8 on a PC laptop is for use with the JumpStart technology. It has never been so easy to install, re-install, or restore a server before.

As I am as a contractor, I am more on the road than in my own office, so I need a laptop, and preferably with Solaris installed, as I am focusing on Sun's products and applications.

Through the years, I have discovered that one of the most common scenarios is that a client needs a server installed, either because they just bought it, or need it re-installed, or recovered.

This article covers how to save time when installing servers, using the JumpStart technology on a laptop with Solaris for Intel.
Ubuntu

How To Make An Ubuntu 11.04 Classic Desktop Resemble A Mac

Post date: July 10, 2011, 11:07 Category: Desktop Views: 4036 Comments
Tutorial quote: This article shows how you can change the appearance of your Ubuntu 11.04 desktop (with the Ubuntu Classic interface, i.e., GNOME instead of Unity) so that it resembles a Mac. This can be achieved with the help of Elementary, Docky, and Gloobus-Preview. Elementary is a project that provides a popular icon set and GTK theme; Docky is an interactive dock (like the one you know from a Mac) that provides easy access to some of the files, folders, and applications on your computer, and more; and Gloobus-Preview is an extension for the Gnome Desktop Environment designed to enable a full screen preview of any kind of file or directory.
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