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.
