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#!/usr/bin/python
import operator
...

print 'delta process: user:', after_process_user - before_process_user
+, 'sys:', after_process_sys - before_process_sys
print 'delta all: user:', after_all_user - before_all_user, 'sys:', af
+ter_all_sys - before_all_sys

#!/usr/bin/perl
use 5.16.0;
...
      ' sys:', $after_process_sys - $before_process_sys;
print 'delta all: user:', $after_all_user - $before_all_user, 
      ' sys: ', $after_all_sys - $before_all_sys;

> export TIMEFORMAT="%2Rsec %2Uusr %2Ssys (%P%% cpu)"

...
python    9          1.82       20.2%
perl      9          8.70       96.7%