[horde] Session issues?
Kevin Konowalec
webadmin at ualberta.ca
Fri Aug 29 14:29:32 UTC 2008
On 29-Aug-08, at 1:12 AM, Michael M Slusarz wrote:
>>
>
> This is what I came up with:
> http://lists.horde.org/archives/cvs/Week-of-Mon-20080825/082646.html
>
> Essentially, removed all lifetime calls from memcache driver
> because memcache doesn't care about garbage collection - it will gc
> automatically when the pool is full. Thus, using
> session.gc_maxlifetime doesn't make much sense to use here.
>
> A couple of other points, while on the memcache topic. First, 6GB
> of memcache seems a little low for a decent sized installation,
> especially if using memcache as the caching driver. Even if you
> have 32-bit machines, you can still get 3GB+ per machine easily.
> Or, better yet, take the splurge and buy a couple of cheap 64-bit
> boxes instead. The great thing about memcache is that it doesn't
> need powerful, server-grade hardware to run. In fact, that is
> overkill. Any cheap 64-bit box is going to be plenty powerful
> enough to handle the memcache load. Quite honestly, your
> bottleneck will come from the network traffic to/from the memcache
> server/PHP server, and most likely the network infrastructure will
> be the limiting factor, not the network I/O speed on any given
> interface card.
>
> Also, absolutely no reason to reboot memcache every night. In
> fact, I highly recommend you don't, especially if you are caching
> with memcache also. Rebooting simply loses all those hardearned
> mailbox/message caches that your servers labored to build every day.
>
> This stuff should probably go in the wiki/FAQ. But I've been
> dealing with the DNC all week and I am beat so maybe someone else
> could be kind enough to start a page and stick it up there.
>
> michael
>
6 Gigs is low? That likely explains part of the problem. I was
under the impression that with the new version of horde the session
data written to memcache was significantly smaller than the previous
version (I could have sworn I read session data was around 1MB per
user). I've got a bunch of machines ready to go that will
essentially double my memcache pool - does 12 Gigs seem reasonable
for a big installation or should I find more?
Thanks!!
K
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