Stefan Behnel added the comment:

What about this: by default, we assume all runtimes to have the same major 
version as the Python runtime that executes the benchmark runner. If that's not 
the case, users must override it explicitly with a command line option, say, 
"--pyversions 2:3" for a reference 2.x and a comparison 3.x version of Python 
(i.e. in the order the programs appear on the command line).

Does that sound ok?

I'd like to avoid a trial-and-fallback approach as that would mean that any 
wrapper scripts would still have to support being called twice and handling the 
-c option in one way or another.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19108>
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