Created
October 18, 2022 21:46
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A minimal profiling module
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# Credits 2020-2022 to Élie Michel <elie.michel@exppad.com> | |
# Released in Public Domain | |
# | |
# The Software is provided "as is", without warranty of any kind, express or | |
# implied, including but not limited to the warranties of merchantability, | |
# fitness for a particular purpose and non-infringement. In no event shall the | |
# authors or copyright holders be liable for any claim, damages or other | |
# liability, whether in an action of contract, tort or otherwise, arising | |
# from, out of or in connection with the software or the use or other dealings | |
# in the Software. | |
from math import sqrt | |
import time | |
from collections import defaultdict | |
# ------------------------------------------------------------------- | |
class Timer(): | |
def __init__(self): | |
self.start = time.perf_counter() | |
def ellapsed(self): | |
return time.perf_counter() - self.start | |
# ------------------------------------------------------------------- | |
class ProfilingCounter: | |
def __init__(self): | |
self.reset() | |
def average(self): | |
if self.sample_count == 0: | |
return 0 | |
else: | |
return self.accumulated / self.sample_count | |
def stddev(self): | |
if self.sample_count == 0: | |
return 0 | |
else: | |
avg = self.average() | |
var = self.accumulated_sq / self.sample_count - avg * avg | |
return sqrt(max(0, var)) | |
def add_sample(self, value): | |
if hasattr(value, 'ellapsed'): | |
value = value.ellapsed() | |
self.sample_count += 1 | |
self.accumulated += value | |
self.accumulated_sq += value * value | |
def reset(self): | |
self.sample_count = 0 | |
self.accumulated = 0.0 | |
self.accumulated_sq = 0.0 | |
def summary(self): | |
"""returns something like XXms (±Xms, X samples)""" | |
return ( | |
f"{self.average()*1000.:.03}ms " + | |
f"(±{self.stddev()*1000.:.03}ms, " + | |
f"{self.sample_count} samples)" | |
) | |
# ------------------------------------------------------------------- | |
profiling_counters = defaultdict(ProfilingCounter) |
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