#!/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()