[web2py] Re: Page hangs when calling subprocess.check_call from within web2py
Good idea to look through uwsgi.log. The problem was harakiri on a process after 60 seconds. There was an entry in the log along the lines of HARAKIRI ON WORKER 4 (pid: 2557, try: 1). To fix, I increased harakiri to 120 in /etc/uwsgi/web2py.xml. That created a new problem which showed up in uwsgi.log as SIGPIPE: writing to a closed pipe/socket/fd (probably the client disconnected) on request . Turns out this is because by default nginx waits a max of 60 seconds for uwsgi to respond to a request. The fix was to add a line to /etc/nginx/sites-available/web2py saying uwsgi_read_timeout 120; Helpful reading for anyone else who comes across this same problem: http://stackoverflow.com/questions/24133315/fixing-broken-pipe-error-in-uwsgi-with-python Thanks again for having pointed me in the right direction. Toby -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[web2py] Re: Page hangs when calling subprocess.check_call from within web2py
On Tuesday, March 24, 2015 at 8:07:45 PM UTC, Niphlod wrote: seems the right job for the scheduler :-P Yeah, maybe you're right. Basically my program generates a large image for a user which takes about 1 min. I want to show please wait on the web-page while it's generating, then show the download link when it's ready. Could I do that if I used the scheduler? How would I make the scheduler talk to the controller function, to show the download link when it's ready? Would I need to use javascript to poll a url periodically to check whether the task is finished? -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[web2py] Re: Page hangs when calling subprocess.check_call from within web2py
On Tuesday, March 24, 2015 at 9:34:41 PM UTC+1, Toby wrote: On Tuesday, March 24, 2015 at 8:07:45 PM UTC, Niphlod wrote: seems the right job for the scheduler :-P Yeah, maybe you're right. Basically my program generates a large image for a user which takes about 1 min. I want to show please wait on the web-page while it's generating, then show the download link when it's ready. Could I do that if I used the scheduler? How would I make the scheduler talk to the controller function, to show the download link when it's ready? Would I need to use javascript to poll a url periodically to check whether the task is finished? yep. -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[web2py] Re: Page hangs when calling subprocess.check_call from within web2py
seems the right job for the scheduler :-P On Tuesday, March 24, 2015 at 6:10:15 PM UTC+1, Toby wrote: Good idea to look through uwsgi.log. The problem was harakiri on a process after 60 seconds. There was an entry in the log along the lines of HARAKIRI ON WORKER 4 (pid: 2557, try: 1). To fix, I increased harakiri to 120 in /etc/uwsgi/web2py.xml. That created a new problem which showed up in uwsgi.log as SIGPIPE: writing to a closed pipe/socket/fd (probably the client disconnected) on request . Turns out this is because by default nginx waits a max of 60 seconds for uwsgi to respond to a request. The fix was to add a line to /etc/nginx/sites-available/web2py saying uwsgi_read_timeout 120; Helpful reading for anyone else who comes across this same problem: http://stackoverflow.com/questions/24133315/fixing-broken-pipe-error-in-uwsgi-with-python Thanks again for having pointed me in the right direction. Toby -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [web2py] Re: Page hangs when calling subprocess.check_call from within web2py
what are you using between nginx and web2py? uwsgi? if that's the case check the uwsgi logs for clues mic 2015-03-19 19:12 GMT+01:00 Dave S snidely@gmail.com: On Thursday, March 19, 2015 at 5:17:21 AM UTC-7, Toby wrote: Hi, I'm having issues using subprocess.call from within a module file in web2py. [...] The funny thing is that if I use an imagemagick command that's faster to run (e.g. a lower resolution image) then it works fine. It's only once the command is so long that it takes about 5 seconds or more that it starts failing when called from within web2py. Any advice on what's going wrong and what to do? I tried using os.system instead but it doesn't work either. I'm running web2py 2.9.5 with nginx on ubuntu 13. It's crossed my mind that nginx might be shutting down the subprocess when it runs too long, but I don't know how to check that. That is my (naive) thought. Does nginx have log files? /dps -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[web2py] Re: Page hangs when calling subprocess.check_call from within web2py
On Thursday, March 19, 2015 at 5:17:21 AM UTC-7, Toby wrote: Hi, I'm having issues using subprocess.call from within a module file in web2py. [...] The funny thing is that if I use an imagemagick command that's faster to run (e.g. a lower resolution image) then it works fine. It's only once the command is so long that it takes about 5 seconds or more that it starts failing when called from within web2py. Any advice on what's going wrong and what to do? I tried using os.system instead but it doesn't work either. I'm running web2py 2.9.5 with nginx on ubuntu 13. It's crossed my mind that nginx might be shutting down the subprocess when it runs too long, but I don't know how to check that. That is my (naive) thought. Does nginx have log files? /dps -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups web2py-users group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
