[Speed] perf 0.7.12: --python and --compare-to options

Hi,

I always wanted to be able to compare the performance of two Python versions using timeit *in a single command*. So I just implemented it! I added --python and --compare-to options.

Real example to show the new "timeit --compared-to" feature:

$ export PYTHONPATH=~/prog/GIT/perf $ ./python-resize -m perf timeit --inherit-environ=PYTHONPATH --compare-to=./python-ref -s 'x = range(1000); d={}' 'for i in x: d[i]=i; del d[i];' --rigorous python-ref: ........................................ 77.6 us +- 1.8 us python-resize: ........................................ 74.8 us +- 1.9 us

Median +- std dev: [python-ref] 77.6 us +- 1.8 us -> [python-resize] 74.8 us +- 1.9 us: 1.04x faster

http://bugs.python.org/issue28199#msg277755

Changes between 0.7.11 and 0.7.12:

• Add --python command line option
• timeit: add --name, --inner-loops and --compare-to options
• TextRunner don't set CPU affinity of the main process, only on worker processes. It may help a little bit when using NOHZ_FULL.
• metadata: add boot_time and uptime on Linux
• metadata: add idle driver to cpu_config

Victor