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vmstat 1 10 extract:
po fr
...
150  10
0  0
0  0

my $tlsamples = @series_po; # = @series_fr
...

$avg_fr = 1 (if $avg_fr == 0); # avoid div/0
my $pofr = $avg_po / $avg_fr; # = 15

po  fr
150 10

po fr
150 10
...
1 1
1 1
1 1