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Unix+clones

Optimizing DSPAM + MySQL 4.1

Post date: April 2, 2006, 22:04 Category: Optimizing Views: 3855 Comments
Tutorial quote: DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. It's great at filtering out spam but on busy mailservers the pruning of the MySQL databases takes way too long time ...
Debian

Using DSPAM & ClamAV With Postfix (Virtual Users) On Debian Etch

Post date: August 14, 2007, 23:08 Category: Security Views: 3382 Comments
Tutorial quote: This article describes how to integrate DSPAM with embedded ClamAV into a mail server based on Postfix featuring virtual users and domains, i.e. users and domains that are in a MySQL database. DSPAM is a scalable and open-source content-based spam filter. The setup shown here is suitable for Debian Etch servers.
Unix+clones

Optimizing C/C++ programs using the GProf profiler

Post date: May 24, 2005, 18:05 Category: Optimizing Views: 6627 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.
OSX

Optimizing Mac OS X performance

Post date: January 18, 2006, 16:01 Category: Optimizing Views: 7099 Comments
Tutorial quote: This FAQ provides recommendations for optimizing MacĀ® OS X performance. Additionally, it provides advice and links to advice for troubleshooting certain Mac OS X performance problems.
Debian

Full Mail Server Solution With Virtual Domains & Users (Debian Etch, Postfix, MySQL, DoveCot, DSpam, ClamAV, Postgrey, RBL)

Post date: October 31, 2007, 09:10 Category: Installing Views: 4048 Comments
Tutorial quote: This guide describes how to set up a full email solution in Debian Linux (all code is from Debian Etch). I was asked to design a secure, scalable, portable solution for a small company. While the guide references many servers, the company only had 4 physical machines, Xen was used to virtualize the entire solution. That particular aspect of the system is not discussed in this guide, although I will try to get it into the next revision.
RedHat

Tuning and Optimizing Red Hat Enterprise Linux for Oracle 9i and 10g Databases

Post date: December 19, 2007, 06:12 Category: Optimizing Views: 9647 Comments
Tutorial quote: This article is a step by step guide for tuning and optimizing Red Hat Enterprise Linux on x86 and x86-64 platforms running Oracle 9i (32bit/64bit) and Oracle 10g (32bit/64bit) standalone and RAC databases. This guide covers Red Hat Enterprise Linux Advanced Server 3 and 4 and the older version 2.1.
RedHat

Tips & tricks: Performance tuning

Post date: November 26, 2005, 00:11 Category: Optimizing Views: 8678 Comments
Tutorial quote: Advanced tips on optimizing your Red Hat server.
Unix+clones

High Performance MySQL

Post date: December 1, 2006, 04:12 Category: Optimizing Views: 5835 Comments
Tutorial quote: The operating system your MySQL server runs on and the server's configuration can be just as important to your server's performance as the indexes, schema, or queries themselves. In this chapter, we will help you understand how to tune your server to improve performance, as opposed to tuning schema or queries. We'll be looking at changes to your hardware, operating system, and MySQL configuration to see what effects they have on overall performance.

We assume that you've already made efforts to boost the performance of your queries. If you haven't done that already, stop now and read Chapter 4 and Chapter 5 to get a handle on optimizing your queries and your application code. Only then should you worry about server settings. Hardware is often not the solution to MySQL performance problems. Poorly optimized queries can slow you down far more than not having the latest CPU or SCSI disk. To put this in perspective, one of the MySQL AB trainers even says that changing hardware might, in the best cases, give you a 10-fold performance increase. But tuning queries (and schemas) can often give you 1000-fold performance increase. Seriously.

Some topics covered in this chapter are platform-specific. The authors' knowledge of the various platforms on which MySQL runs is limited. In many cases, you'll need to consult your local documentation for various operating system tools and specifics.

We start with an overview of the factors that limit performance and then look more in depth at RAID, hardware, and operating system issues. The chapter finishes with a discussion of techniques you can use to locate, identify, and fix bottlenecks.
Linux

Optimizing Linux filesystems

Post date: April 12, 2005, 07:04 Category: Benchmarks Views: 3519 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

Optimizing Desktop Performance, Part III

Post date: May 31, 2005, 14:05 Category: Optimizing Views: 4322 Comments
Tutorial quote: For desktop and laptop users who want a fast-booting operating system, getting rid of services you do not need can appear to improve performance. Obviously, if you are new to Linux, though, you probably do not know which processes you can get rid of safely nor how to stop them and keep them from restarting at boot time.
Web-based applications and online marketing solutions - LumoLink