Realtime stream plotting with gnuplot
Requirements
- gnuplot
- Perl
- stdbuf
Demo
For a demo, use the following snippets.
$ ./sine_cosine.pl | ./driveGnuPlots.pl 2 50 500 "Sine" "Cosine"
$ ./sine.pl | ./driveGnuPlots.pl 1 50 "Sine"
CPU utilization
To plot CPU utilization for the past 60 seconds, use the snippet below.
$ vmstat 1 | stdbuf -oL awk '{print "0:" 100-$(NF-2)}' | ./driveGnuPlots.pl 1 60 "CPU"
Please note that stdbuf is the key here, without which the pipeline won't work as intended.
Credits
- Code adapted from https://www.thanassis.space/gnuplotStreaming.html (Thanassis Tsiodras, Sep 2008)