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Background ---------- Graphit is a tool that reads time-based numeric data over a network socket and plots it in near real-time. Here's a screenshot: http://github.com/marktriggs/Graphit/blob/master/screenshot.png I'm in the unfortunate position of being a systems administrator by day, and that means keeping an eye on lots of different things--load averages, number of Apache processes, number of threads for certain applications, things like that. Tools like RRDTool do a great job of gathering and plotting data, but they're not really designed for real-time visualisation. I wanted something I could stare at in the quieter moments. Graphit uses the wonderful JFreeChart (http://www.jfree.org/jfreechart/) to do its plotting. The other bits (the easy bits) are Clojure code to handle reading data from a socket, tracking multiple graphs, and that sort of thing. Building it ----------- Thanks to the wonders Of Leiningen and Clojars this should be easy to build. The steps: 1. Get Leiningen from http://github.com/technomancy/leiningen and put the 'lein' script somewhere in your $PATH. 2. From graphit's root directory, run `lein uberjar'. Lein will grab all required dependencies and produce a `graphit.jar'. Note: Thanks to Java's AWT madness you seem to need your DISPLAY environment variable set to even compile the thing. 3. Run the jar with, for example: java -jar graphit.jar --redraw 2000 --port 6666 This will redraw all graphs once every two seconds, and will listen on port 666 for data. Trying it out ------------- Once Graphit is running, you can plot some random lines just by using bash and netcat: #!/bin/bash while [ 1 ]; do for i in 1 2 3; do for j in 1 2 3; do echo -e "graph$i\t$j\t$RANDOM" done done sleep 1 done | nc localhost 6666 And that's about all there is to know: you connect to Graphit on its port, send it one-reading per line in either this format: name of graph[tab]name of line[tab]y value or this one: name of graph[tab]x value[tab]name of line[tab]y value or if you want to do times: name of graph[tab]time string[tab]name of line[tab]y value[tab]SimpleDateFormat string JFreeChart gives some niceties for free: you can drag a rectangle to zoom in, hold down control and click+drag to pan around, right click to get a context menu. All sorts of wonderful things. The end. Thanks for reading.