STINNER Victor added the comment:

I suggest to use my perf module to run benchmark, especially if the tested 
function takes less than 1 ms, which is the case here.

Attached benchmark script calls asyncio.get_event_loop(). Result on the master 
branch with PR 3347:

haypo@selma$ ./python ~/bench_asyncio.py --inherit=PYTHONPATH -o patch.json
haypo@selma$ ./python ~/bench_asyncio.py --inherit=PYTHONPATH -o ref.json
haypo@selma$ ./python -m perf compare_to ref.json patch.json 

Mean +- std dev: [ref] 881 ns +- 42 ns -> [patch] 859 ns +- 14 ns: 1.03x faster 
(-3%)

I'm not convinced that the PR is worth it. 3% is not interesting on a micro 
benchmark.

Or is there an issue in my benchmark?

----------
Added file: http://bugs.python.org/file47120/bench_asyncio.py

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