BTW, been thinking about this a bit...

If it was just a matter of parallelism V non-parallelism, that would be 1 issue.

But the 2nd big issue: Look at the total cpu time used: 

lang    #thrds  #cores_used  %efficency   clocktime     cputime(Usr+Sy
+s)
python    9          1.82       20.2%        67.35s         122.53s
perl      9          8.70       96.7%         3.36s         29.23

[download]
From the above, stated as percentages or multipliers, perl is 478% more efficient in making use of multicore resources.

In real time, python takes 64 seconds longer over the base time that was needed, of 3.36s. Python is 1900% SLOWER.

Someone mentioned python might not be optimal in parallelism due to threading problems.

So look at the actual amount of CPUtime used for each to do the work. 122.53/29.23. For heavy number crunching, perl (with max precision possible in x86-64 HW, takes less than 1/4th the time, i.e. perl is 4.2x the speed of python.
----

(Notes collected for a response to the "said" note writer...)

In reply to Re^3: parallelism v.python by perl-diddler
in thread parallelism v.python by perl-diddler

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