Memcached PHP Sessions

Jure Petrovic fonz at
Tue Feb 6 10:01:00 UTC 2007

I must agree on that. Especially, if you are not 
running a .gov website.


On Tue, 2007-02-06 at 10:27 +0100, BUSTARRET, Jean-Francois wrote:
> > > Plus session handling has a large impact on load-balancer 
> > CPU, and a CPU-starved load-balancer has an impact on all 
> > your HTTP traffic (even the one that does not need sessions, 
> > ie static content).
> > >
> > 
> > TCP/HTTP Load Balancer, such as HA proxy, use a single-process,
> > event-driven model which considerably reduces the cpu usage even under
> > high load, not difficult to saturate your network bandwidth with
> > modern CPU.
> I was speaking for LARGE sites. I don't think your HA proxy will handle
> 30k HTTP requests/s (or 100k TCP sessions) with Layer 7 processing
> (parsing cookies and so on).
> If you have to spend 100k$ on a pair of hi-end load-balancers just to
> handle session affinity (without 100% reliability), or spend 2GB of RAM
> to store session in memcached (without 100% reliability), what is the
> most cost effective solution ?
> I'm not telling memcached is THE solution, but something that must be
> considered (cost wise). IMHO, memcached as a session cache with a DB
> backend would me much safer (if your sessions are not updated too
> often).

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