Stefan Krah added the comment:

In my experience it is very hard to get stable benchmark results with Python.  
Even long running benchmarks on an empty machine vary:

wget http://www.bytereef.org/software/mpdecimal/benchmarks/telco.py
wget http://speleotrove.com/decimal/expon180-1e6b.zip
unzip expon180-1e6b.zip

taskset -c 0 ./python telco.py full


$ taskset -c 0 ./python telco.py full

Control totals:
Actual   ['1004737.58', '57628.30', '25042.17']
Expected ['1004737.58', '57628.30', '25042.17']
Elapsed time: 7.16255
$ taskset -c 0 ./python telco.py full

Control totals:
Actual   ['1004737.58', '57628.30', '25042.17']
Expected ['1004737.58', '57628.30', '25042.17']
Elapsed time: 6.982884
$ taskset -c 0 ./python telco.py full

Control totals:
Actual   ['1004737.58', '57628.30', '25042.17']
Expected ['1004737.58', '57628.30', '25042.17']
Elapsed time: 7.095349000000001
$ taskset -c 0 ./python telco.py full

Control totals:
Actual   ['1004737.58', '57628.30', '25042.17']
Expected ['1004737.58', '57628.30', '25042.17']

----------
nosy: +skrah

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