Rasmus Lerdorf wrote: > On Mon, 19 Aug 2002, Yasuo Ohgaki wrote: > > >>Zeev Suraski wrote: >> >>>I don't think that's the way to do it at all. In theory, it's no >>>problem to track whether changes were made to the session data, and >>>perform the write at the end of the request, only if we tracked a >>>change. That's only in theory, though, since with the fancy new >>>$_SESSION array, there's no way to track whether changes were made to >>>the session data. I can try to think of a solution, though. >>> >>>I don't see any advantage in reading the session data, comparing it with >>>the serialized currently-active data, and comparing the two. It'll >>>probably be slower than simply writing the whole thing all over again. >>> >> >>It could be faster just saving data always. >> >>All depends on situation, session data storage, session data server >>loads, size of session data, number of concurrent accesses to servers, >>how often session data is changed and so on. >> >>BTW, I don't see strong needs of ommiting write when session data >>is not changed. I'm point it out that it can be done, and possibly >>faster, with user defined session save handler if one need it. >> >>For my applications, session data is changed often enough. I >>don't need the feature omitting session write automatically. > > > But there are still a lot of cases where not writing the session data at > the end of a request will simplify things quite a bit and also be much > more efficient. I am not too concerned about not writing based on whether > or not data changed, I'd like the user to be able to specify that it > shouldn't be written through session_readonly(). This avoids locking > issues in complex framed sites and avoids a lot of useless writes when the > author knows there will be no changes or wants to make sure that any > inadvertent changes are not written. >
I agree. We should be able to release resource explicitly. Session could make throughput awful w/o it. -- Yasuo Ohgaki -- PHP Development Mailing List <http://www.php.net/> To unsubscribe, visit: http://www.php.net/unsub.php
