Nathaniel Smith <[email protected]> added the comment:
Please insert the usual caveats around how reliable benchmarking is impossible.
(Last month when I tried this with a previous version of the patch, the
interpreter that had the patch applied -- and thus was doing slightly *more*
work -- was consistently a few percent faster in general, because something
something PGO I guess? Compilers are weird.)
That said, I'm not seeing any measurable difference at all with this patch.
This isn't surprising: in the default mode (tracking disabled), the extra
operations are:
coroutine creation: 'if (predictably_true) { self->a = NULL; self->b = NULL }'
send/throw: 'if (genobject->ob_type == PyCoro_Type && self->a != NULL) { /* not
executed, because the condition always fails */ }'
----- benchmark details
I built 3954f6126f (head of my PR branch, labeled "with-unawaited-coroutines"
below) and f23746a934 (its immediate parent, on master, labeled
"without-unawaited-coroutines" below), with --enable-optimizations, on a
Thinkpad T450s running 64-bit Linux. I ran a script (included below) that
simply created and executed a trivial coroutine over and over, and measured
using perf.
2 runs of each, alternating:
~/src/cpython$ without-unawaited-tracking/install/bin/python3 corobench.py
.....................
coroutine creation/close: Mean +- std dev: 3.90 us +- 0.11 us
~/src/cpython$ with-unawaited-tracking/install/bin/python3 corobench.py
.....................
coroutine creation/close: Mean +- std dev: 3.90 us +- 0.09 us
~/src/cpython$ without-unawaited-tracking/install/bin/python3 corobench.py
.....................
coroutine creation/close: Mean +- std dev: 3.93 us +- 0.21 us
~/src/cpython$ with-unawaited-tracking/install/bin/python3 corobench.py
.....................
coroutine creation/close: Mean +- std dev: 3.91 us +- 0.10 us
Script: attached as "corobench.py"
----------
Added file: https://bugs.python.org/file47405/corobench.py
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<https://bugs.python.org/issue30491>
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