There was a demand to process all testing data and generate graphs. There was a perl script to process everything but was outdated. To plot the graphs it used GNUplot. I found lack of documentation, although everything I found on the internet (blogs, stackoverflow). What my parser required was to use multiplot to generate 3 rows and 2 colums graphs, read data from files. The each column has to have own title above them.
GNUplot is really powerful and I will be happy to use it once again.