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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:
'''
import argparse
import asyncio
import signal
import sys
import traceback
import time
import types
import os
from experiment import Experiment
from asyncio.base_events import _format_handle
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
# temp
task = None
dilation = 1.0
@staticmethod
def __init__(task, speedup, e_duration, w_time, signal_interval=0.01):
os.environ["PYTHONASYNCIODEBUG"] = "1"
Nemesis.signal_interval = signal_interval
Nemesis.e_duration = e_duration
Nemesis.r_duration = w_time
# temporary
Nemesis.task = task
Nemesis.speedup = speedup
@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.curr_experiment = Experiment(Nemesis.task, Nemesis.speedup)
@staticmethod
def _stop_experiment():
if Nemesis.curr_experiment is not None:
print(f'finished running {Nemesis.curr_experiment.get_task()} 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()
# print(loops)
for loop in loops:
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:
if (fmt_handle := _format_handle(handle)) is not None \
and fmt_handle not in handles:
# no duplicates
handles.append(fmt_handle)
return handles
@staticmethod
def _should_trace(filename):
'''Returns FALSE if filename is uninteresting to the user.
Don't depend on this. It's good enough for testing.'''
# FIXME Assume GuixSD. Makes filtering easy
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
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.',
metavar='',
type=float,
default=0.5)
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 the minimum time of 100 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()
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