Re: [PHP-DEV] Speed/Performance From: szii <email protected>
Date: 12/15/00

Most correct...however, we're trying to hammer it. We WANT it to thrash.
We WANT it to choke. Until it does, we can't see where our performance
bottlenecks are. Adding more RAM would simply hide possible chokepoints.
Again, it's a dev machine that's not running production stuff. But if we
can
get some numbers on this little K6, we can be assured that when we move
it to the REAL servers that it'll run well, and has already been tweaked
against a lower-profile machine.

-Szii

----- Original Message -----
From: Stig S. Bakken <ssb <email protected>>
To: <szii <email protected>>
Cc: <php-dev <email protected>>
Sent: Friday, December 15, 2000 5:04 AM
Subject: Re: [PHP-DEV] Speed/Performance

> szii <email protected> wrote:
> >
> > We're running some speed trials right now, and seeing that .php files
> > are taking considerably longer even if they have NO <?php ?> tags.
> > They're static pages, but by having the extension they're running slower
> > do to the parser running through them.
> >
> > Does anyone have any "performance" tips for PHP files? Caches that
> > aren't turned on by default?
> >
> > Here are the ones I know:
> > Compile into Apache, not as a DSO
> > Lots O RAM
> > Don't use "known php extensions" for non-php files.
> >
> > We're taking a single-CPU client running a multithreaded app.
> > It spawns X threads each of which open a socket, requests a
> > file, and shuts down the socket.
> >
> > At 100 threads we're choking the server (K6 233) and not
> > even touching the client's CPU usage. We're also deep
> > into VM/swap space, even at 192 MB RAM. This is quite
> > obviously not our production server (cringe at the thought).
> > We're just "playing" with this one.
> >
> > Any one have more ideas? 2.4 kernel with khttpd? Won't affect
> > PHP, but could make static pages faster...
>
> It seems to me like you have a memory problem. With Apache/PHP you are
> in deep trouble if you run out of physical memory, and when you say that
> your server is choking, it sounds to me like it's "trashing" (spends
> most of its time paging memory in and out). 192MB RAM is not exactly a
> lot these days, even my laptop has more. :-)
>
> try {
> while (server_trashes) {
> add_more_ram();
> }
> } catch (OutOfMemorySlotsException) {
> rewrite_code();
> }
>
> I wouldn't consider running a system like the one you are outlining with
> less than 512MB.
>
> - Stig 

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