Re: Slow apache response
From: Tulio Guimarăes da Silva (tuliogs_at_pgt.mpt.gov.br)
Date: 08/22/05
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Date: Mon, 22 Aug 2005 12:07:07 -0300 To: FreeBSD Mailing Lists <freebsd-performance@freebsd.org>
A bit late, but... :)
Shane Ambler wrote:
>On 18/8/05 12:40 AM, "Shane Ambler" <Shane@007Marketing.com> wrote:
>
>>n 17/8/05 9:43 PM, "Claus Guttesen" <kometen@gmail.com> wrote:
>>
>>
>>>>Apart from apache there is sendmail and ssh running (and the basics such as
>>>>tty's, cron and syslog)
>>>>All pages are php.
>>>>Any ideas on how I can get response times up?
>>>>
>>>>
>>>Are you running apache 1.3 or 2.0? Is httpd.conf configured *not* to
>>>do reverse dns-look-up, 'HostnameLookups Off'. Try setting 'KeepAlive
>>>Off' if set to on.
>>>
>>erver version: Apache/1.3.33 (Unix)
>>Server built: Feb 10 2005 12:34:22
>>
>>KeepAlive on
>>HostnameLookup off
>>
>>I'll try changing KeepAlive
>>
>Setting KeepAlive off seemed to make improvements initially but it has
>slowed down again (2 hours later) - maybe I need to look at caching?
>
>
Keepalive Off shouldn´t really help much if Apache is not topping the
maximum number of processes.
For what it seems (to me), the problem is not directly apache-related,
but maybe PHP, Mysql or some other "peripheral" system, since CPU and
proccess usage is not the bottleneck. Anyway, there are a few tricks I
can suggest - excuses if some are too elementary, but these could also
help other people: ;)
1) Apache: check "Min/Max SpareServers", "Startservers" (which I
guess, from your first message, it´s set to 150) and (important)
"MaxClients". If they´re set to reasonable values, then the problem is
probably elsewhere;
2) PHP: try varying some settings in phi.ini (usually in
/usr/local/etc). Ports intallations suggest tuning "output_buffering"
and I would also suggest you to look at memory_limit. It could be also a
good idea to enable error logging to figure out if other settings are
insufficient;
3) Mysql: there seems to be some performance issues with this one.
There´s a not-so-old thread discussing Mysql performance in FBSD
compared to Linux, and even though our Mysql usage in FBSD here at work
is almost to be ignored, :) there are some good performance tips in
there that helped;
4) and, finally, OS&hardware: try to see how much memory is
effectively being used and by who; maybe some apps (like PHP) are
auto-limiting their memory use. Also, there has been a few issues with
I/O in 5.4, specially with RAID and fxp subsystems - e.g.: I just raised
by about 20-30% disk transfer rates on a DL380 and by 50% on a ML-110
with Highpoint RR1820A. ;)
Don´t the logs show any anormality (massive crashes, timeouts, etc.)?
I hope this all could help. Have luck,
Tulio G. da Silva
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- Previous message: Alexander Trubin: "page faults"
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