def reset(self):
"""Must be called before running rollout()."""
self.cleanup()
self.port = get_open_udp_port()
#start sender as an instance of Sender class
sys.stderr.write('Starting sender...\n')
self.sender = Sender(self.port, train=True)
self.sender.set_sample_action(self.sample_action)
self.sender.set_update_Qnet(self.update_Qnet)
# start receiver in a subprocess
sys.stderr.write('Starting receiver...\n')
receiver_src = path.join(project_root.DIR, 'env',
'run_receiver.py') # path of run_receiver.py
recv_cmd = 'python %s $MAHIMAHI_BASE %s' % (receiver_src, self.port)
cmd = "%s -- sh -c '%s'" % (self.mahimahi_cmd, recv_cmd)
sys.stderr.write('$ %s\n' % cmd)
#Popen: Execute a child program in a new process.
#preexec_fn is set to a callable object, this object will be called in the child process just before the child is executed. (Unix only)
#os.setsid: To keep the child process running while the parent process exit.
self.receiver = Popen(cmd, preexec_fn=os.setsid, shell=True)
# sender completes the handshake sent from receiver
self.sender.handshake()
state = [
self.sender.delay_ewma, self.sender.send_rate_ewma,
self.sender.delivery_rate_ewma, self.sender.cwnd
]
return state
def reset(self):
"""Must be called before running rollout()."""
self.cleanup()
self.port = get_open_udp_port()
# start sender as an instance of Sender class
sys.stderr.write('Starting sender...\n')
self.sender = Sender(self.port, train=True)
self.sender.set_sample_action(self.sample_action)
# start receiver in a subprocess
sys.stderr.write('Starting receiver...\n')
receiver_src = path.join(project_root.DIR, 'env', 'run_receiver.py')
recv_cmd = 'python %s $MAHIMAHI_BASE %s' % (receiver_src, self.port)
cmd = "%s -- sh -c '%s'" % (self.mahimahi_cmd, recv_cmd)
sys.stderr.write('$ %s\n' % cmd)
self.receiver = Popen(cmd, preexec_fn=os.setsid, shell=True)
# sender completes the handshake sent from receiver
self.sender.handshake()