monitoring
Get flash to fully experience Pearltrees
administration
RRDtool - About RRDtool
What RRDtool does RRDtool is the OpenSource industry standard, high performance data logging and graphing system for time series data. RRDtool can be easily integrated in shell scripts, perl, python, ruby, lua or tcl applications. Download RRDtool is available for download from this site. It compiles on a number of different Linux and Unix platforms as well as on Microsoft Windows.
What it does You have a router, you want to know what it does all day long? Then MRTG is for you. It will monitor SNMP network devices and draw pretty pictures showing how much traffic has passed through each interface. Routers are only the beginning.
MRTG - Tobi Oetiker's MRTG - The Multi Router Traffic Grapher
Regarding a performance penalty - there isn't one on the client side. The JS itself is trivially fast, and the reporting back to the server can be done with an XHR after page load, which affects nothing in the user experience. On the server side you'll get twice as many requests. If that's a bottleneck, you could set up a different server just for the timing responses.
What is the best way to measure Client Side page load times? - Stack Overflow
Projects - Big Sister System and Network Monitor
The Big Sister network monitor is a real time system and network health monitoring application ... more Web frontends share some common functionality like template mechanisms, navigation/menus, authentication, session management and so on. The Big Sister web application framework is the core of all of the web frontends being part of the various Big Sister projects ... more