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process.py
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process.py
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import math
import subprocess
import time
from typing import List
import psutil
MB_SIZE = math.pow(1024, 2)
class Process:
def __init__(self, cmd: List[str]):
self.cmd = cmd
self.t0 = time.time()
self.t1 = None
self.max_rss_memory = 0
self.max_vms_memory = 0
self.state = None
self.process = None
def exec(self):
self.process = subprocess.Popen(self.cmd, shell=False)
self.state = True
def await_completion(self):
if not self._check_state():
return False
self.t1 = time.time()
try:
pp = psutil.Process(self.process.pid)
descendants = list(pp.children(recursive=True))
descendants = descendants + [pp]
rss_memory = 0
vms_memory = 0
for descendant in descendants:
try:
mem_info = descendant.memory_info()
rss_memory += mem_info[0]
vms_memory += mem_info[1]
except psutil.NoSuchProcess:
pass
self.max_rss_memory = max(self.max_rss_memory, rss_memory)
self.max_vms_memory = max(self.max_vms_memory, vms_memory)
except psutil.NoSuchProcess:
return self._check_state()
return self._check_state()
def is_running(self) -> bool:
return psutil.pid_exists(self.process.pid) and self.process.poll() is None
def get_statistics(self) -> dict:
res = dict()
res['command'] = ' '.join(self.cmd)
res['start_time'] = self.t0
res['finish_time'] = self.t1
res['run_time_sec'] = (self.t1 - self.t0) if self.t1 else 0
res['max_rss_memory_mb'] = self.max_rss_memory / MB_SIZE
res['max_vms_memory_mb'] = self.max_vms_memory / MB_SIZE
return res
def _check_state(self):
if not self.state:
return False
if self.is_running():
return True
self.state = False
self.t1 = time.time()
return False