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)

TODO

• https://github.com/dkogan/feedgnuplot
• https://github.com/dpavlin/cheali-logview-gnuplot/blob/master/driveGnuPlots.pl