[phpa] Re: files needed if using shm too?

> Maybe a page which outputs 200K is a bit big ;-)

I'd say so. I'd click 'stop' and probably go to another site :-) Do you use 
mod_gzip? That can reduce content size dramatically.

> Its running a customized Phorum-3.3.2 with some includes and so on ...
> with the output of around 200 KB of the page its also not really small.
> ;-) But I think the load on the database is simply negating the effect
> of phpa.

Not negating, but reducing. You'll always get a speed up, but if your 
system has other bottlenecks then they could be a dominant factor.

> As far as I tested for now I get an increase of 30% with a concurrency
> of 10  (which is maybe a bit too high).
> I will run some more tests tomorrow and give you some feedback on it.

The concurrency level doesn't seem to make a huge difference, although the 
additional overhead does reduce the number of pages / sec by a bit.

> That brings me to a feature request. ;-)
> Sorry if I compare it to some comparing project but APC has some nice
> things like using more than one 32 MB-segment and allocating the
> shm-segments on the fly. So there are only the number of shm-segments
> used which were really needed. How about this in phpa?

Not at all, and I welcome the suggestions. I was also thinking about this 
last night after talking to someone else, and it should be fairly straight 
forward. From what I gather, APC took the decision to allocate multiple 
small segments to reduce cache contention, but I have doubts about whether 
that's efficient of effective. The PHPA cache design shouldn't stall that 
often because it supports simulataneous reading and writing, and also 
allows processes to be executing a script in the cache that at the same 
time is being rewritten with a new version.  But not having enough SHM *is* 
potentially a problem, and so this is something that I'll look to put in 
soon. It'll be a good 'Sunday afternoon' task :-)

nick


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