Archive for the 'Tuning' Category
- Understanding Linux and UNIX Load Average - How It Works
Have you ever wondered how those three little numbers that appear in the UNIX w or uptime/top command load average (LA) report are calculated?
This is an excellent read if you would like learn more about how and how the load average (LA) can be reorganized to do better capacity planning.
The article concludes that:
These inherited [...] - DTrace by Example: Solving a Real-World Problem
This article shows the use of DTrace to solve a real-life problem, following the reasoning behind the process. The author presents short scripts and explains the language fragments used.
Dynamic Tracing (DTrace) in the Solaris 10 OS is too complex to cover in just one short article. Here the author explores how DTrace can be [...] - Boost Linux desktop performance by reducing memory footprint
A few tweaks can boost performance can boos Linux desktop performance.
The ideas in this article may help you breathe life (and some additional security) into your old machines and make better use of Linux on aging hardware.
A lack of physical memory can severely hamper Linux performance. In this article, learn how to accurately measure the [...] - How to protect buggy programs from security vulnerabilities under Linux and UNIX
A Buffer overflows is a serious security problem. It allows an attacker to inject executable code of their choice into an already-running application. This ability to run arbitrary code at certain memory addresses is dangerous as attacker being able to execute the instructions from anywhere in memory.
To protect bufferoverflow security vulnerabilities use diehard
With such problems [...] - Linux hard drive benchmark & bottleneck testing software suite for performance
The stress test of hardware (hard drive benchmarks) is a simplistic test. There are a number of benchmarking applications software that can be used as hard disk (storage) stress testing. My favorite is Bonnie++ software.
From the project home page:
Bonnie++ is a benchmark suite that is aimed at performing a number of simple tests of hard [...] - Interesting PHP performance related articles roundup
PHP is a very fast programming language, but there is more to optimizing PHP than just speed of code execution. You need to tweak Apache, PHP and other things.
Here are some good articles about php (read as PHP tips) performance optimization.
=> How to install and configure Alternative PHP Cache - The Alternative PHP [...] - Apache mod_perl tuning howto documentation
mod_perl is a module for the Apache web server. It embeds a Perl interpreter into the Apache server itself, so that dynamic content produced by Perl scripts can be served in response to incoming requests, without the significant overhead of re-launching the Perl interpreter for each request.
This improves overall performance of perl based application. [...] - Lighttpd prevent image hotlinking or leeching or direct linking
Hotlinking or leeching or direct linking comes under Bandwidth theft (also known as Inline linking).
Wikipedia defines Inline linking as:
Inline linking, also known as hotlinking, leeching, or direct linking is the placing of a linked object, often an image, from one site in a web page belonging to a second site. The second site [...] - Improve Apache (LAMP) security with mod_proxy
Virtual hosting with multiple user IDs is possible to increase Apache security with mod_proxy.
In this article, Nick Maynard outlines a method for you to improve the security of a LAMP setup by using Apache’s mod_proxy module. This article is specific to Linux; however, you can also apply some of the principles to other operating systems.
One [...] - Howto Set Processor affinity on AIX UNIX
I have already written about how to use processor affinity to restrict a process and run it only on a specified central processing unit (CPU) under Linux.
This document talks about setting Processor affinity on AIX.
From the article:
Processor affinity is a facility provided by operating systems, and you can use it on multi-processor hardware. All [...]
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