P.S. In the end the bottle neck is ALWAYS database access.
On Aug 24, 12:20 am, mdipierro <mdipie...@cs.depaul.edu> wrote: > In Java a serverlet, as far as I understand, is a class which conforms > to some API that allows it to serve one http request. Each instance is > executed in its own thread. The Python equivalent of the serverlet API > is a WSGI application and web2py is based on WSGI, therefore the > parallelization mechanism is equivalent to Java serverlets. > > In web2py (the same in Django, Pylons, any any WSGI app) each http > request is executed in its own thread. Threads are recycled to server > non-concurrent requests and reuse database connections (pooling) > without need to close and reopen them. The web server can be > configured for a min number and a max number of threads. > > I think the GIL in this context is a false problem. In fact in > production you can use Apache and run as many processes as the number > of cores that you have. Each process will create as many threads as it > needs to server multiple requests. The GIL is a problems only if one > process runs multiple threads on multiple cores. It is possible there > are some caveats with many cores but I have not really played with > apache configurations and benchmarks. > > I do not think using Jython helps anything. According to these tests: > http://blog.dhananjaynene.com/2008/07/performance-comparison-c-java-p... > http://pyevolve.sourceforge.net/wordpress/?p=1189 > Jython is 2x-3x slower than cpython. So you may get better scaling > with multiple cores but you pay huge perfomance hit. > > Web2py runs on Jython but there is a known bug in Java regular > expressions that Sun marked as "won'tfix" that can cause runaway > problems when parsing complex templates. This is not a web2py specific > problem but we have seen effects of the bug in some web2py apps. > > Massimo > > On Aug 23, 11:29 pm, pierreth <pierre.thibau...@gmail.com> wrote: > > > Hello, > > > I would like to know how Web2py is managing threads. Is it like Java > > servlets where requests are mapped to servlets while one servlet > > object can be used by multiple threads at the same time to serve many > > requests? > > > Are some users here using Jython with Web2py to get around the ugly > > Pyhton GIL? I would to know about your experience. > > > ------------------ > > Pierre
