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March 31, 2022 17:01
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Simple script to measure different function calling styles
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| class Test: | |
| def f1(self, a, b, reps): | |
| def cmp(a, b): | |
| return | |
| for i in range(reps): | |
| cmp(a, b) | |
| def _f2(self, a, b): | |
| return | |
| def f2(self, a, b, reps): | |
| for i in range(reps): | |
| self._f2(a, b) | |
| def format_time(dt): | |
| units = {"nsec": 1e-9, "usec": 1e-6, "msec": 1e-3, "sec": 1.0} | |
| scales = [(scale, unit) for unit, scale in units.items()] | |
| scales.sort(reverse=True) | |
| for scale, unit in scales: | |
| if dt >= scale: | |
| break | |
| return "%.3g %s" % (dt / scale, unit) | |
| import time | |
| timer = time.perf_counter | |
| test = Test() | |
| # Show when inner functions become faster than methods | |
| t1 = t2 = 0 | |
| reps = 100 | |
| while t2 <= t1: | |
| start = timer() | |
| test.f1(1,2, reps) | |
| t1 = timer() - start | |
| start = timer() | |
| test.f2(1,2, reps) | |
| t2 = timer() - start | |
| print(reps, '-> inner:', format_time(t1), 'method:', format_time(t2)) | |
| reps += 100 | |
| max_reps = reps | |
| # Show timings | |
| stats = { | |
| # TestCase class -> (assertASTEqual, compares) | |
| 'CosmeticTestCase': (16, 232), | |
| 'DirectoryTestCase': (685, 2951999), | |
| 'UnparseTestCase': (841, 2953878), | |
| } | |
| for name, (calls, compares) in stats.items(): | |
| reps = min(compares // calls, max_reps) | |
| print(f'{name} ({reps} compares)') | |
| start = timer() | |
| for i in range(calls): | |
| test.f1(1,2, reps) | |
| t1 = timer() - start | |
| print(' inner:', format_time(t1)) | |
| start = timer() | |
| for i in range(calls): | |
| test.f2(1,2, reps) | |
| t2 = timer() - start | |
| print(' method:', format_time(t2)) |
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