[phpa] Re: Reliability and uptime

Hi Geoff,

On Fri, Dec 28, 2001 at 12:41:56PM -0000, Geoff Caplan wrote:
> 
> Nick
> 
> I have an application that involves some heavy lifting ( with some requests
> running over 4000 lines of code) so finding the right cache solution is a
> priority.
> 
> But my Linux admin skills are limited so I really need a "set and forget"
> solution. How confident are you that 1.2 will be relatively problem-free and
> will allow long periods of uptime on RedHat 7.1?
> 
> Lurking on their lists, it seems that some of the other non-commercial
> solutions seem to be struggling to achieve this kind of reliabliity. Are you
> pretty confident that you have cracked it? Is it safe and sensible for a
> Linux newbie to deploy phpa on a production server?

Thanks for your interest in PHPA. Regarding stability, it's likely that you
should be fine, but I would highly recommend a period (days rather than hours)
of testing for your own particular setup.  Any problems of memory corruption
within PHP itself may be more likely to show up with PHPA installed because
memory is reused from one request to the next rather than effectively being
reinitialised for each request, and it's possible that there are obscure
bugs that haven't yet been exposed within PHPA itself.

I am aware of one site that has occasional problems, but the cause isn't
identified, and from what I can tell, most sites that try it work successfully.

I would also suggest that you use at least 4.0.7RC3 as this fixes
some memory corrupting bugs in 4.0.6

Version 1.2 is far less susceptible to locking up apache if apache
crashes because phpa now doesn't lock while executing scripts, only
while locating them in the shm cache or writing to the cache. It also
attempts to detect processes that have crashed and releases any locks
that were held at the point of crashing. However this mechanism isn't
foolproof.

Try it and monitor it for a bit and see how you get on, and turn on
the shm logging and make sure you check the apache errors log for 
signs of problems.

Hope this helps,

Nick

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