模拟CPU使用接近100%，如果是多核CPU，将下面脚本同时运行多个就可以。
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def deadloop():
while True:
pass
deadloop()
调用子进程
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import subprocess
def run_cmd(cmd):
try:
process = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
result_f,error_f = process.stdout,process.stderr
errors = error_f.read()
if errors:
raise Exception(errors)
else:
result = result_f.read().decode()
return result
except Exception as e:
print('Exception: ' + str(e))
