Move venv setup from pyperformance?

[gsnedders]

Playing around with pyperf, I can't help but think I'm going to end up reimplementing/importing a bunch of the pyperformance code around venvs. When testing performance of almost any Python code, I probably want to do it with it installed rather than from within a source tree, which means that any user of pyperf will end up implementing that.

I don't really know what makes the most sense API-wise; one obvious option would be a context manager which allows you to with runner.venv("requirements.txt") as env: env.bench_func("name", func) perhaps?

[vstinner]

I'm not really excited by the idea of moving the venv feature from pyperformance into pyperf. Can't you use another tool to setup a venv to run benchmarks? I would prefer to restrict pyperf to a single task: run benchmark (and analyze results and compare results).