If you have the error "connection closed by SUMO" this would not be solved
by repeating the simulation in the same traci connection. Diagnose it using
logfiles as explained in my last email.

2018-07-11 12:29 GMT+02:00 胡志强 <hzq950...@gmail.com>:

> Hi Jakob,
> I have add the option numTries=100 to traci.start(),but the error is still
> exist.Could you please tell me is there a approach to repeat my simulation
> in the same traci ?Then ,I don't need to connect the server again and
> again,my problem solved.
>
> Best regards,
> Zhiqiang
>
> Jakob Erdmann <namdre.s...@gmail.com> 于2018年7月11日周三 下午2:44写道:
>
>> the error "connection closed by SUMO"  indicates that an error ocurred on
>> the SUMO side.
>> If you create a log file for every sumo run you can look for the problem
>> in the latest logfile:
>>
>> for i in range(20000):
>>    traci.start([sumoBinary, "--start","-c", "data/cross.sumocfg",
>>                           "--tripinfo-output", "tripinfo.xml", "log",
>> str(i)])
>>
>>
>> 2018-07-11 5:47 GMT+02:00 胡志强 <hzq950...@gmail.com>:
>>
>>> Hi Jakob,
>>> Thank you,it works.But the problem is also exist,it retries for 101
>>> times then closed and I'm sure that my computer's memory is enough.And I
>>> also occurred the error that "connection closed by SUMO",If you want more
>>> details,tell me.
>>>
>>> Best regards,
>>> Zhiqiang
>>>
>>> Jakob Erdmann <namdre.s...@gmail.com> 于2018年7月11日周三 上午1:13写道:
>>>
>>>> traci.start([sumoBinary, "--start","-c", "data/cross.sumocfg",
>>>>                           "--tripinfo-output", "tripinfo.xml"],
>>>> numTries=100)
>>>>
>>>>
>>>> 2018-07-10 16:46 GMT+02:00 胡志强 <hzq950...@gmail.com>:
>>>>
>>>>> Hi,
>>>>> Could you please tell me how add the option numTries=100 to
>>>>> traci.start()?
>>>>>
>>>>> Best regards,
>>>>> Zhiqiang
>>>>>
>>>>> Jakob Erdmann <namdre.s...@gmail.com> 于2018年7月10日周二 下午10:27写道:
>>>>>
>>>>>> - Possibly the simulation cannot start in time because the computer
>>>>>> is still busy from closing the previous simulations. You could add the
>>>>>> option numTries=100 to traci.start() to diagnose this
>>>>>> - Possibly, the simulation cannot start successfully because your
>>>>>> computer is out of memory (which might indicate a memory leak in sumo).
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2018-07-10 16:04 GMT+02:00 胡志强 <hzq950...@gmail.com>:
>>>>>>
>>>>>>> Hi,
>>>>>>> My SUMO version is 0.32.0,and I write a loop to simulate for many
>>>>>>> times, I start SUMO like this:
>>>>>>> for i in range(20000):
>>>>>>>     traci.start([sumoBinary, "--start","-c", "data/cross.sumocfg",
>>>>>>>                           "--tripinfo-output", "tripinfo.xml"])
>>>>>>>     ...
>>>>>>>     ...
>>>>>>>     traci.close()
>>>>>>> At the beginning,it works well,but it may disconnect with traci and
>>>>>>> the time points is different.I don't know what's wrong.
>>>>>>>
>>>>>>> Menno van der Woude <me...@codingconnected.eu> 于2018年7月10日周二
>>>>>>> 下午9:32写道:
>>>>>>>
>>>>>>>> Hi Zhiqiang,
>>>>>>>>
>>>>>>>> it could be helpful if you provide some more details:
>>>>>>>> Under what circumstances does the connection fail? Do the
>>>>>>>> circumstances
>>>>>>>> during failure differ from before? Does it disconnect while it is
>>>>>>>> connected, or not connect at all? Etc.
>>>>>>>> Also, how are you starting SUMO, manually, programmatically? Etc.
>>>>>>>>
>>>>>>>> Greets, Menno
>>>>>>>>
>>>>>>>> On 10-7-2018 15:27, 胡志强 wrote:
>>>>>>>> > At the beginning ,it works well,but some time later,it may
>>>>>>>> disconnect
>>>>>>>> > with the sever.So ,what's the possible reasons?
>>>>>>>> >
>>>>>>>> > Best regards,
>>>>>>>> > Zhiqiang
>>>>>>>> >
>>>>>>>> >
>>>>>>>> >
>>>>>>>> > Menno van der Woude <me...@codingconnected.eu
>>>>>>>> > <mailto:me...@codingconnected.eu>> 于2018年7月10日周二 下午8:44写道:
>>>>>>>> >
>>>>>>>> >     Hi Zhiqiang,
>>>>>>>> >
>>>>>>>> >     it seems like SUMO is not running, since the the client
>>>>>>>> cannot connect
>>>>>>>> >     to the TCP server. Make sure you start SUMO with the
>>>>>>>> --remote-port
>>>>>>>> >     <INT>
>>>>>>>> >     option as described here: http://sumo.dlr.de/wiki/TraCI#
>>>>>>>> SUMO_startup.
>>>>>>>> >
>>>>>>>> >     If you need to simulate many runs, you will have to automate
>>>>>>>> starting
>>>>>>>> >     SUMO as well.
>>>>>>>> >
>>>>>>>> >     Greets,
>>>>>>>> >
>>>>>>>> >     Menno
>>>>>>>> >
>>>>>>>> >     On 10-7-2018 14:34, 胡志强 wrote:
>>>>>>>> >      > Dear sumo-users:
>>>>>>>> >      >          I am doing a traffic light program to optimize the
>>>>>>>> >     timing of
>>>>>>>> >      > traffic light by using Traci.But I met a problem,I need to
>>>>>>>> >     simulate the
>>>>>>>> >      > process again and again,then,I got this error:
>>>>>>>> >      >
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 2 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 3 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 4 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 5 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 6 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 7 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 8 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 9 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      >   Retrying in 10 seconds
>>>>>>>> >      > Could not connect to TraCI server at localhost:55141
>>>>>>>> [Errno 111]
>>>>>>>> >      > Connection refused
>>>>>>>> >      > Traceback (most recent call last):
>>>>>>>> >      >    File "main.py", line 78, in <module>
>>>>>>>> >      >      train(RL_natural)
>>>>>>>> >      >    File "main.py", line 26, in train
>>>>>>>> >      >      observation = env.reset()
>>>>>>>> >      >    File
>>>>>>>> >      >
>>>>>>>> >     "/home/huzhiqiang/traffic-signal-control/traci_tls_PER_
>>>>>>>> 8s_lr0.00025/trafficlight_env.py",
>>>>>>>> >
>>>>>>>> >      > line 110, in reset
>>>>>>>> >      >      "--tripinfo-output", "tripinfo.xml"])
>>>>>>>> >      >    File "/home/huzhiqiang/sumo/tools/traci/__init__.py",
>>>>>>>> line 86,
>>>>>>>> >     in start
>>>>>>>> >      >      _connections[label] = connect(port, numRetries,
>>>>>>>> "localhost",
>>>>>>>> >      > sumoProcess)
>>>>>>>> >      >    File "/home/huzhiqiang/sumo/tools/traci/__init__.py",
>>>>>>>> line 64,
>>>>>>>> >     in connect
>>>>>>>> >      >      raise FatalTraCIError("Could not connect in %s tries"
>>>>>>>> %
>>>>>>>> >     (numRetries
>>>>>>>> >      > + 1))
>>>>>>>> >      > traci.exceptions.FatalTraCIError: Could not connect in 11
>>>>>>>> tries
>>>>>>>> >      >
>>>>>>>> >      > How can I fix it?
>>>>>>>> >      >
>>>>>>>> >      > Best regards,
>>>>>>>> >      > Zhiqiang
>>>>>>>> >      >
>>>>>>>> >      >
>>>>>>>> >      >
>>>>>>>> >      > _______________________________________________
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