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#!/usr/bin/env python3
'''
_/ _/ _/
_/_/ _/ _/_/ _/_/_/ _/_/ _/_/ _/_/_/ _/_/_/
_/ _/ _/ _/_/_/_/ _/ _/ _/ _/_/_/_/ _/_/ _/ _/_/
_/ _/_/ _/ _/ _/ _/ _/ _/_/ _/ _/_/
_/ _/ _/_/_/ _/ _/ _/ _/_/_/ _/_/_/ _/ _/_/_/
Copyright 2025 bdunahu
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Commentary:
Code:
'''
from collections import defaultdict
from experiment import Experiment
import argparse
import asyncio
import os
import signal
import sys
import time
import traceback
import types
class Nemesis(object):
# the (ideal) interval between samples
signal_interval = 0.0
# the timestamp which the last sample was taken
last_sample = None
# the current experiment being run
curr_experiment = None
# results from previous experiments, represented as strings
results = []
# The duration of each performance experiment
e_duration = None
# The number of seconds remaining in this performance experiment.
r_duration = None
# A mapping of event loops to the previous running coroutine.
prev_coro = defaultdict(lambda: None)
# temp
coro = None
dilation = 1.0
@staticmethod
def __init__(coro, speedup, e_duration, w_time, signal_interval=0.01):
Nemesis.signal_interval = signal_interval
Nemesis.e_duration = e_duration
Nemesis.r_duration = 0
# temporary
Nemesis.coro = coro
Nemesis.speedup = max(speedup, 1.0)
@staticmethod
def start():
Nemesis.last_sample = time.perf_counter()
signal.signal(signal.SIGALRM,
Nemesis._signal_handler)
signal.setitimer(signal.ITIMER_REAL,
Nemesis.signal_interval,
Nemesis.signal_interval)
@staticmethod
def stop():
signal.setitimer(signal.ITIMER_REAL, 0)
Nemesis._stop_experiment()
for r in Nemesis.results:
print()
print(r)
@staticmethod
def _start_experiment():
Nemesis.r_duration = Nemesis.e_duration
Nemesis.prev_coro = defaultdict(lambda: None)
Nemesis.curr_experiment = Experiment(Nemesis.coro, Nemesis.speedup)
@staticmethod
def _stop_experiment():
if Nemesis.curr_experiment is not None:
print(f'finished running {Nemesis.curr_experiment.get_coro()} with speedup {Nemesis.curr_experiment.get_speedup()}')
Nemesis.results.append(Nemesis.curr_experiment.get_results())
del Nemesis.curr_experiment
@staticmethod
def _signal_handler(sig, frame):
curr_sample = time.perf_counter()
passed_time = curr_sample - Nemesis.last_sample
Nemesis.last_sample = curr_sample
if Nemesis.curr_experiment:
loops = Nemesis.curr_experiment.get_loops()
exp_coro = Nemesis.curr_experiment.get_coro()
for loop in loops:
coro = Nemesis._get_current_coro(loop)
prev_coro = Nemesis.prev_coro[loop]
if not prev_coro == coro:
if prev_coro == exp_coro:
loop.ping_exit_coro()
elif coro == exp_coro:
loop.ping_enter_coro()
Nemesis.prev_coro[loop] = coro
loop._update_ready(True)
handles = Nemesis._get_waiting_handles(loop)
Nemesis.curr_experiment.add_handles(handles, loop, passed_time)
Nemesis.r_duration -= passed_time
if (Nemesis.r_duration <= 0):
Nemesis._stop_experiment()
Nemesis._start_experiment()
def _get_waiting_handles(loop):
handles = []
for handle in loop._ready:
# no duplicates
handle_info = Nemesis._parse_handle(handle)
if handle_info not in handles:
handles.append(handle_info)
return handles
def _parse_handle(handle):
cb = handle._callback
if isinstance(getattr(cb, '__self__', None), asyncio.tasks.Task):
task = cb.__self__
coro = task.get_coro()
return [task.get_name(), Nemesis.get_coro_name(coro)]
else:
return [str(type(handle).__name__), cb.__name__]
def _get_current_coro(loop):
tid = loop._thread_id
assert tid, f"{loop} is not running, yet we attempted to sample it!"
frame = sys._current_frames().get(tid)
fname = frame.f_code.co_filename
while not Nemesis._should_trace(fname):
if frame:
frame = frame.f_back
else:
break
if frame:
fname = frame.f_code.co_filename
if frame and frame.f_generator:
return frame.f_generator.cr_code.co_name
return None
@staticmethod
def _should_trace(filename):
'''Returns FALSE if filename is uninteresting to the user.
Don't depend on this. It kind of sucks.'''
if not filename:
return False
if '/gnu/store' in filename:
return False
if '/usr/local/lib/python' in filename:
return False
if 'site-packages' in filename:
return False
if 'propcache' in filename:
return False
if '.pyx' in filename:
return False
if filename[0] == '<':
return False
if 'nemesis' in filename:
return False
return True
def get_coro_name(coro):
'''
Stolen from _format_coroutine in cpython/Lib/asyncio/coroutines.py
'''
# Coroutines compiled with Cython sometimes don't have
# proper __qualname__ or __name__. While that is a bug
# in Cython, asyncio shouldn't crash with an AttributeError
# in its __repr__ functions.
if hasattr(coro, '__qualname__') and coro.__qualname__:
coro_name = coro.__qualname__
elif hasattr(coro, '__name__') and coro.__name__:
coro_name = coro.__name__
else:
# Stop masking Cython bugs, expose them in a friendly way.
coro_name = f'<{type(coro).__name__} without __name__>'
return f'{coro_name}()'
the_globals = {
'__name__': '__main__',
'__doc__': None,
'__package__': None,
'__loader__': globals()['__loader__'],
'__spec__': None,
'__annotations__': {},
'__builtins__': globals()['__builtins__'],
'__file__': None,
'__cached__': None,
}
if __name__ == "__main__":
# parses CLI arguments and facilitates profiler runtime.
parser = argparse.ArgumentParser(
usage='%(prog)s [args] -- prog'
)
parser.add_argument('-i', '--interval',
help='The minimum amount of time inbetween \
samples in seconds.',
metavar='',
type=float,
default=0.01)
parser.add_argument('-s', '--speedup',
help='The amount of virtual speedup. Cannot go below one. Default is 2.0.',
metavar='',
type=float,
default=2.0)
parser.add_argument('-c', '--task',
help='The task to virtually speedup.',
metavar='',
type=str,
required=True)
parser.add_argument('-e', '--experiment-duration',
help='The performance experiment duration. Defaults to 4 seconds.',
metavar='',
type=float,
default=4)
parser.add_argument('-w', '--warmup-time',
help='Amount of time to wait until the first performance experiment. Default is 0 milliseconds',
metavar='',
type=float,
default=0.1)
parser.add_argument('prog',
type=str,
nargs='*',
help='Path to the python script and its arguments.')
args = parser.parse_args()
sys.argv = args.prog
try:
with open(args.prog[0], 'r', encoding='utf-8') as fp:
code = compile(fp.read(), args.prog[0], "exec")
Nemesis(args.task,
args.speedup,
args.experiment_duration,
args.warmup_time,
args.interval).start()
exec(code, the_globals)
Nemesis.stop()
except Exception:
traceback.print_exc()
|
