Add stat.pl script

README.md

@@ -74,7 +74,19 @@ $ env/bin/python -m pingpong >out.csv
 
 ## Process the results
 
-Install [Matplotlib](https://matplotlib.org/) to plot the results
+There is a `stat.pl` Perl script analyzing the output file printing basic statistics,
+for example:
+```
+$ ./stat.pl out.csv
+min:    1.12097477912903
+p05:    1.12548685073853
+median: 1.14409327507019
+p95:    1.20510101318359
+max:    1.22065734863281
+```
+
+If you want to visualize the data,
+install [Matplotlib](https://matplotlib.org/) to plot the results
 and [pandas](https://pandas.pydata.org/) to process the collected data:
 ```
 . env/bin/activate

stat.pl

@@ -0,0 +1,23 @@
+#!/usr/bin/env perl
+use v5.30;
+use strict;
+use warnings;
+
+my $file = $ARGV[0] or die "Missing command line argument\n";
+open(my $data, '<', $file) or die "Could not open '$file'\n";
+my $prev;
+my @values = ();
+while (my $line = <$data>) {
+  chomp $line;
+  my @fields = split "," , $line;
+  if (defined $prev) {
+     push(@values, $fields[1] - $prev)
+  }
+  $prev = $fields[1]
+}
+@values = sort @values;
+say "min:    " . ($values[0]);
+say "p05:    " . ($values[int($#values * 5 / 100)]);
+say "median: " . ($values[int($#values / 2)]);
+say "p95:    " . ($values[int($#values * 95 / 100)]);
+say "max:    " . ($values[-1]);