Did I Read that reading files inside controller will block web2py , Does it?
Thats a bad news.. i am doing a file crawler and while crawling , web2py is blocked even tho the process talke only 25% of 1 out of 4 CPUs .. On 8/25/10, pierreth <[email protected]> wrote: > I would appreciate a good reference to understand the concepts you are > talking about. It is something new to me and I don't understand. > > On 25 août, 11:22, John Heenan <[email protected]> wrote: >> No, nothing that abstract. Using WSGI forces a new thread for each >> request. This is is a simple and inefficient brute force approach that >> really only suits the simplest Python applications and where only a >> small number of concurrent connection might be expected. >> >> Any application that provides web services is going to OS block on >> file reading (and writing) and on database access. Using threads is a >> classic and easy way out that carries a lot of baggage. Windows has >> had a way out of this for years with its asynch (or event) >> notification set up through an OVERLAPPED structure. >> >> Lightttpd makes use of efficient event notification schemes like >> kqueue and epoll. Apache only uses such schemes for listening and Keep- >> Alives. >> >> No matter how careful one is with threads and processes there always >> appears to be unexpected gotchas. Python has a notorious example, the >> now fixed 'Beazly Effect' that affected the GIL. Also I don't think >> there is a single experienced Python user that trusts the GIL. >> >> John Heenan >> >
