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Re: [sumo-user] Disconnect with Traci
Possibly. Unless the error is caused by SUMO closing with an error before opening the socket.
You can run multiple simulations on the same connection by using the function traci.load
See http://sumo.dlr.de/daily/pydoc/traci.html#-load

regards,
Jakob

2018-07-11 14:34 GMT+02:00 胡志强 <hzq950419@xxxxxxxxx>:
Hi Jakob.
If I have the error"Could not connect to TraCI server at ..",will this be solved by repeating the simulation in the same traci connection?If  yes ,how?

Best regards,
Zhiqiang

Jakob Erdmann <namdre.sumo@xxxxxxxxx> 于2018年7月11日周三 下午6:52写道：
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 <hzq950419@xxxxxxxxx>:
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.sumo@xxxxxxxxx> 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 <hzq950419@xxxxxxxxx>:
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.sumo@xxxxxxxxx> 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 <hzq950419@xxxxxxxxx>:
Hi,
Could you please tell me how add the option numTries=100 to traci.start()?

Best regards,
Zhiqiang 

Jakob Erdmann <namdre.sumo@xxxxxxxxx> 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 <hzq950419@xxxxxxxxx>:
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 <menno@xxxxxxxxxxxxxxxxxx> 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 <menno@xxxxxxxxxxxxxxxxxx
> <mailto:menno@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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