Re: Sessions

On Mon, Sep 15, 2008 at 1:27 PM, Stut <stuttle@gmail.com> wrote: > On 15 Sep 2008, at 18:10, Dan Joseph wrote: > >> >> >> Stut, something I noticed you do is run the GC 10% of the time. I am >> currently running mine with the session.gc_probability = 50. Do you find >> that 10% is enough? Or was that really just for example? >> > > It's really just an example, and it's worth noting that your custom session > handler doesn't need to call the GC explicitly at all since the session > extension will do it for you. > > The history behind this code is that it was designed for a high traffic > site with a high repeat visitor ratio. The 10% of the time was actually 0.1% > on the site when it launched and it worked really well, but it was a very > specific set of circumstances. At 10% the DB was spending most of its time > cleaning up the session table. I should also probably say that I removed a > large chunk of code before posting it (which lead to the errors Jim > spotted). It was doing analysis on the sessions before deciding which to > clean up, based mainly on the activity level of each user. But like I said, > this was a very specific set of circumstances. > > A lot will depend on the performance of your database, how often visitors > come back, what your desired session lifetime is and a number of other > factors - every site is different. I've found 10% to work well for smaller > sites but it really is a balancing act that can only be mastered through > trial and error. > > -Stut > > -- > http://stut.net/ > Ah ok. That's good information. I'm not sure how active the system I just built is truly going to be. We're growing, they're focusing more on it, etc. I will keep that busy site you talked about in mind though. My 50% is probably way high. -- -Dan Joseph www.canishosting.com - Plans start @ $1.99/month. "Build a man a fire, and he will be warm for the rest of the day. Light a man on fire, and will be warm for the rest of his life."