PUBLIC MARKS with tags performance & monitoring

So slow pages can have a very real impact on your business. These are some very real incentives for whipping your site into shape, so let’s move on from the why to the how.

A nifty graphical interface for monitoring the usage of Redis instances

Graphic stand-alone administration for memcached to monitor and debug purpose

A memcache php script that lets you get stats and dump from multiple memcache servers

When tuning a site's performance, a system administrator needs certain tools to measure and monitor how the site is doing under increasing load, as well as identify where bottlenecks may be. Linux system performance monitoring tools On Linux, there are several tools available to you to do this. We describe what we have found as the most helpful in this section.

Opsview is enterprise network and application monitoring software designed for scalability, flexibility and ease of use. Opsview has been in development since 2003 and is released under the GNU GPL license. Current version is 2.12. Opsview is a fully integrated monitoring tool that incorporates popular Open Source software including Nagios, Net-SNMP and RRDtool. The Catalyst web framework provides an extensible monitoring and configuration user interface. Opsview software is supported on Linux (Debian, CentOS, RHEL and Ubuntu) and Solaris 10. It will monitor all common operating systems including Windows. Opsview extends the capabilities of Nagios in the following ways: * Distributed monitoring with high availability and fail-over * Much improved SNMP support with trap processing with rules engine * API supporting automation of Opsview configuration * Data warehouse for storage of historical performance and event data * Opsview Reports customisable reporting * Powerful configuration and management UI * Extended monitoring UI * Extensible architecture based on Catalyst Web Framework and Altinity middleware software

good stuff for perfmon

jvmstat est un outil qui permet de surveiller le fonctionnement d'une machine virtuelle sans impacter les performances. Cet outil est utilisable à partir du JDK 1.4.2. Le JSR 174 devrait standardiser cette possibilité.

Spotlight® on MySQL diagnoses MySQL problems in real time by graphically displaying all database activity in an intuitive user interface, enabling you to respond quickly to issues that need attention. With Spotlight on MySQL, DBAs or developers running Windows can drill down to locate in-depth information on the source of a performance issue. And because the run-time nature of your MySQL databases is unique, Spotlight calibrates itself to a baseline of normal database activity. This allows Spotlight to automatically establish the speed of the internal flows and other activity indicators. When a threshold is met, Spotlight notifies you using a visual or audible alert. Spotlight on MySQL supports MySQL versions 5.0 or later that employ the InnoDB storage engine.

This template provides a host template and associated graphs for graphing the output of the memcached stats command on individual memcached installations.

Last Sunday I casually wrote a post about the most common pitfalls in photography. I had written the post a long time ago, but I never put it on this site. The story ended up on the front page of Digg, stayed there for nearly 12 hours and was picked up by a bunch of secondary sources, resulting in 100,000 Visitors within a day (most of them within the first 12 hours). Trying to keep my server up and alive, I learned a lot about what it takes to keep the server alive, hence I decided to slide a non photography related post in, hopefully giving everyone who finds themselves in a similar situation some points to consider.