Hi, Am Mittwoch, den 07.03.2007, 21:48 +0100 schrieb Dieter Maurer: > Christian Theune wrote at 2007-3-7 20:09 +0100: > >I was looking through some publisher code and found that the > >`process_request` method which takes the request body as a file-like > >object and processes it as a FieldStorage happens within the application > >thread. > > > >This would be better if it happened beforehand because it can takes up > >time while a transaction is running and a thread is used although it > >doesn't require any application-specific code. > > In my view, it already now happens far too early, because > it may raise exceptions and those exceptions are not handled > by the "standard_error_message" usually used for error processing > depending on the url. > > > Therefore, if you move out things, you should take care that > you move out only parts that cannot raise exceptions.
Ah. Interesting point! > Furthermore, you seem to propose to move work from a worker thread > to the IO (i.e. "ZServer") thread. I do not think that it is a good idea to > put significant work on the IO thread. > > Note, that the IO thread is responsible to handle all IO. > When you keep it busy with other tasks, it will not handle IO... Right. This optimization is about leveraging the fact that in many situations the upstream bandwith is *much* lower than the IO bandwith to the disk. Another condition that I have (and I think this is the general pattern) is that application threads should be given back to the pool as quickly as possible. If 5 seconds are spend in the application thread to untangle mime data which has nothing application-specific about it and then only 100ms or so in the application itself, I'd say there is a major overhead problem. Christiabn -- gocept gmbh & co. kg - forsterstraße 29 - 06112 halle/saale - germany www.gocept.com - [EMAIL PROTECTED] - phone +49 345 122 9889 7 - fax +49 345 122 9889 1 - zope and plone consulting and development
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