On Thursday, 21 May 2020 21:45:44 BST Sereysethy TOUCH wrote: > I am on MacOS, it is a development phase, but deployment will be on Linux. > > It is hard to run dtrace/dtruss on MacOS due to the "system integrity > protection" on MacOS. I got some output but very limited information. > > So if there is a workaround you might suggest?
Why bother debugging it on macOS it never has to work there? If you are targetting linux then develop and test in linux I'd recommend. I use VMware fusion on the mac and run VMs for the target environements I need. Works very well. Barry > > TS > > On Thu, May 21, 2020 at 10:20 PM Jean-Paul Calderone < > > exar...@twistedmatrix.com> wrote: > > On Thu, May 21, 2020 at 3:56 PM Sereysethy TOUCH < > > > > touch.sereyse...@gmail.com> wrote: > >> Hi Jean-Paul, > >> > >> I found the error after working on a short, self contained, correcte > >> example. It is not about twisted and normal thread in general, but > >> something else. > >> > >> After more tests, I come to realise that whenever I instantiate this > >> class PolicyClient from this library > >> https://github.com/ray-project/ray/blob/master/rllib/env/policy_client.py > >> in my protocol or just anywhere, twisted app either freezes or > >> terminates, and this *only* happens when the app runs as a daemon, > >> created using a service (.tac file). > >> > >> I hope you can take a look at the class PolicyClient, why it causes > >> problem to reactor main loop. Please point me to where the idea might > >> come > >> from. > >> > >> I can give you the example but not sure if it is enough, as the client > >> needs to connect to a server. > > > > It looks like PolicyClient does a blocking HTTP request in __init__. > > Since PolicyClient is instantiated in the reactor thread, this will block > > the reactor. Perhaps this call is hanging for some reason when the > > process > > has daemonized? This would be unusual but not unheard of. For example, > > there are macOS environments where a process does not have access to the > > network if it is not associated with a windowing session. > > > > What platform do you observe the problem on, and what more can you learn > > about what the process does on its way to hanging (eg can you run strace > > on > > it)? > > > > Jean-Paul > > > >> Thank you, > >> TS > >> > >> > >> On Thu, May 21, 2020 at 5:23 PM Jean-Paul Calderone < > >> > >> exar...@twistedmatrix.com> wrote: > >>> On Thu, May 21, 2020 at 10:58 AM Sereysethy TOUCH < > >>> > >>> touch.sereyse...@gmail.com> wrote: > >>>> Hello, > >>>> > >>>> I am developing a twisted app, and it runs as a service using twistd -y > >>>> to start the app. > >>>> I am having a problem of running a thread. I know it is not recommended > >>>> to use thread, but the library that I use, the object created is > >>>> running in > >>>> a thread. > >>>> > >>>> Here is the problem: > >>>> > >>>> 1) if I start reactor by running reactor.run() directly, thread is > >>>> running fine > >>>> 2) if I run it as a service using twisted, the thread is not running, > >>>> it runs but it seems to be blocked, because I tried to write something > >>>> to > >>>> file using time.sleep(), but file is empty. > >>>> > >>>> Is there something that I miss? How can I debug this? > >>> > >>> A good next step would be to create at Short, Self Contained, Correct > >>> (Compilable), Example <http://sscce.org/> and share it. > >>> > >>> Jean-Paul > >>> > >>>> Thank you, > >>>> > >>>> TS > >>>> _______________________________________________ > >>>> Twisted-Python mailing list > >>>> Twisted-Python@twistedmatrix.com > >>>> https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > >>> > >>> _______________________________________________ > >>> Twisted-Python mailing list > >>> Twisted-Python@twistedmatrix.com > >>> https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > >> > >> _______________________________________________ > >> Twisted-Python mailing list > >> Twisted-Python@twistedmatrix.com > >> https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > > > > _______________________________________________ > > Twisted-Python mailing list > > Twisted-Python@twistedmatrix.com > > https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
