Thanks for the clarification. @Michael, do you use the logging module? How?
On Jul 20, 4:00 am, Graham Dumpleton <graham.dumple...@gmail.com> wrote: > On Jul 20, 5:17 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > The problem with IOError, I can understand. As Graham says, if the > > client closes the connection before the server responds or if the > > server timesout the socket is closed and apache logs the IOError. > > That isn't what I said. If you see that message when using daemon > mode, the Apache server process that is proxying to the daemon process > is crashing. This is different to the HTTP client closing the > connection. You would only see that message if HTTP client closed > connection if using embedded mode. > > I know they are using daemon mode as that is the only situation where > they could also see the message about premature end of script headers. > > > What I really do not understand is why some requests are handled by > > multiple threads. web2py is agnostic to this (unless you use Rocket > > which you do not). web2py only provides a wsgi application which is > > executed - per thread - by the web server. It is the web server (in > > your case apache) that spans the thread, maps requests to threads, > > calls the web2py wsgi application for each of them. > > > If this is happening it is a problem with apache or with mod_wsgi. > > More likely the problem is that they are registering the logging > module from multiple places and that is why logging is displayed more > than once. They should log the thread ID as well as that would confirm > whether actually from the same thread where logging module handler has > been registered multiple times. > > Multiple registrations of logging handler could occur if it isn't done > in a thread safe why, ie., so as to avoid multiple threads doing it at > the same time. > > Graham > > > Can > > you tell us more about the version of ubuntu, apache and mod_wsgi that > > you are using? Any additional information will be very useful. > > > Massimo > > > On Jul 19, 9:01 pm, Michael Toomim <too...@gmail.com> wrote: > > > > I'm getting errors like these in my apache error logs: > > > > [Mon Jul 19 18:55:20 2010] [error] [client 65.35.93.74] Premature end > > > of script headers: wsgihandler.py, > > > referer:http://yuno.us/init/hits/hit?assignmentId=1A7KADKCHTB1IJS3Z5CR16OZM4V... > > > [Mon Jul 19 18:55:20 2010] [error] [client 143.166.226.43] Premature > > > end of script headers: wsgihandler.py, > > > referer:http://yuno.us/init/hits/hit?assignmentId=1A9FV5YBGVV54NALMIRILFKHPT1... > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.204.99.178] mod_wsgi > > > (pid=7730): Exception occurred processing WSGI script '/home/toomim/ > > > projects/utility/web2py/wsgihandler.py'. > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] mod_wsgi > > > (pid=7730): Exception occurred processing WSGI script '/home/toomim/ > > > projects/utility/web2py/wsgihandler.py'. > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] mod_wsgi > > > (pid=7730): Exception occurred processing WSGI script '/home/toomim/ > > > projects/utility/web2py/wsgihandler.py'. > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] IOError: > > > failed to write data > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] mod_wsgi > > > (pid=7730): Exception occurred processing WSGI script '/home/toomim/ > > > projects/utility/web2py/wsgihandler.py'. > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] IOError: > > > failed to write data > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] mod_wsgi > > > (pid=7730): Exception occurred processing WSGI script '/home/toomim/ > > > projects/utility/web2py/wsgihandler.py'. > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] IOError: > > > failed to write data > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] mod_wsgi > > > (pid=7730): Exception occurred processing WSGI script '/home/toomim/ > > > projects/utility/web2py/wsgihandler.py'. > > > [Mon Jul 19 18:55:50 2010] [error] [client 117.201.42.84] IOError: > > > failed to write data > > > > My web app gets about 7 requests per second. At first, things work > > > fine. Then after a while it seems like every request gets handled by > > > MULTIPLE threads, because my logging.debug() statements print multiple > > > copies of each message and it seems my database gets multiple entries. > > > And I get these errors in the apache logs (with LogLevel debug). > > > > Any idea what to do? Where to look? I'm on ubuntu.
