Shane Hathaway wrote:
Roger Ineichen wrote:
Do you know something about the performance of WSGI?
I whould be happy to see some perfomance tests comparing WSGI with other server concepts.
WSGI is extremely lightweight, so WSGI itself isn't going to affect performance. The WSGI servers I know about are reasonably fast.
What's the overhead of a WSGI middleware? Is the overhead cost in the same order of magnitude as a simple function call with a return value or is there something inherently more complex going on?
From my current experience I usually classify things into the groups of:
1. attribute access 2. function calls 3. adapter lookups Going from one of these groups into the next one has a very noticeable performance cost involved, if used on the critical path of the application. The same goes for "contract checks" in terms of: 1. getattr(object, 'foo') 2. isinstance(object, Foo) 3. IFoo.providedBy(object) If you want to design things for astonishing speed, you need to make trade-offs in terms of configurablity ;) Hanno