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Posted to users@httpd.apache.org by "devnull@plugthebox.net" <de...@plugthebox.net> on 2006/01/29 23:39:16 UTC
[users@httpd] high load average on Apache 1.3 hosting 8000 conc. users forum
Dear List members,
I'm the administrator of a big website that hosts an important forum
(VBulletin to be precise). At peak time we get around 7000-9000
concurrent users (counting the php sessions, members visiting the forum)
the switch (Foundry) counts 2700 concurrent connections.
during those peak times, the apache server (RHEL 4 AS, Apache 1.3, php)
gets a load average of 80~170. the mysql server runs smoothly at 0.9 ~
3.
Browsing the Internet / following some optimizations HOWTOs didn't help.
Can anyone kindly support me on that issue?
Sincerely,
--
devnull@plugthebox.net <de...@plugthebox.net>
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc.
users forum
Posted by ht...@karsites.net.
Here is an efficient *FREE* php accelerator that may help
improve performance.
http://www.php-accelerator.co.uk/
I think it's also alot easier to set up than Turck mmCache,
with similar performance improvements.
Keith
In theory, theory and practice are the same;
In practice they are not.
On Mon, 30 Jan 2006, Eugene wrote:
> To: users@httpd.apache.org From: Eugene
> <li...@fsck.net> Subject: Re: [users@httpd] high
> load average on Apache 1.3 hosting 8000 conc.
> users forum
>
> On Sun, Jan 29, 2006 at 05:07:53PM CST, devnull@plugthebox.net <de...@plugthebox.net> wrote:
> :
> : Well the issue is that at peak times, the server doesn't
> : respond, typing in SSH becomes sometimes slow, memory
> : usage is fairly used (4GB of rams). The machine is a
> : dual xeon 3.0 / SCSI hard disks. What do you mean by
> : "disks maxed out" ?
>
> Does your machine hit swap?
>
> : Mainly VBulletin is a php script. I don't serve much
> : static html files. How can php be tuned to optimize its
> : performance?
>
> Get a PHP enhancer, e.g. Turck mmCache.
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc. users forum
Posted by Eugene <li...@fsck.net>.
On Sun, Jan 29, 2006 at 05:07:53PM CST, devnull@plugthebox.net <de...@plugthebox.net> wrote:
:
: Well the issue is that at peak times, the server doesn't respond, typing
: in SSH becomes sometimes slow, memory usage is fairly used (4GB of
: rams). The machine is a dual xeon 3.0 / SCSI hard disks. What do you
: mean by "disks maxed out" ?
Does your machine hit swap?
: Mainly VBulletin is a php script. I don't serve much static html files.
: How can php be tuned to optimize its performance?
Get a PHP enhancer, e.g. Turck mmCache.
--
Eugene Lee
eugene at fsck dot net
"falassi ninqui y�lar, �mentielma ennauva"
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Re: [users@httpd] high load average on Apache 1.3 hosting
8000 conc. users forum
Posted by "devnull@plugthebox.net" <de...@plugthebox.net>.
Hello,
Can we start first by checking if my httpd.conf is well configured? I
have 2 webservers, load balanced by a Foundry switch. both httpd.conf's
are:
KeepAlive On
MaxKeepAliveRequests 300
KeepAliveTimeout 15
MinSpareServers 10
MaxSpareServers 30
StartServers 50
MaxClients 250
MaxRequestsPerChild 1000
remember, i usually get 2800+ connections which show on the VBulletin
forum around 8000 concurrent users.
Thank you,
--
devnull@plugthebox.net <de...@plugthebox.net>
Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc.
users forum
Posted by Jean Bonnot <hb...@link2mail.net>.
devnull@plugthebox.net a écrit :
>Mainly VBulletin is a php script. I don't serve much static html files.
>How can php be tuned to optimize its performance?
>
>
>
Usually, any php-forum has an option to make it storing generated pages
as html-static. In that case,
pages are regenerated only when a user make something new in it. This
act nearly as a cache.
In that case, your webserver will serves only "static pages" : your php,
wich is I think a module
dynamycally linked in your apache, will made is job only when he has to
do it: not regenerating the
same page again and again. Try to make a ration on how much time php
regenerate the same page
(how much people are seeing it) and how much times the page is changed
(someone reply in a forum) ?
(The ration might be worst on the thread list indexes).
After that, you should enable a mod expire on your graphic content
and/or html pages or delegate
this part on another server.
Try to see if you can enable mod_deflate and or mod_gzip but serving
only pre-gzipped files: I
remember this was an option but I didn't see it for a long time.
Usually, when looking for an enhanced way to serve static content, you
should take a look at
http://www.lighttpd.net/ or http://www.acme.com/software/thttpd/ or boa
or even zeus..
With apache, you can achieve nearly these enhanced performances server
when playing with
kqueue, poll/epoll, threaded based server. The worst multiplexing model
being select-prefork one.
I have nothing against apache and I respect it's developper's great work
but it's too general to
serve high loads web servers.
Continuing to descend low in the system, you should look more carefully
at your tcp-stacks buffers
but it's depend on your system. But if you don't know what's this,
forget this asap. ;-)
JB.
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000
conc. users forum
Posted by "devnull@plugthebox.net" <de...@plugthebox.net>.
Joshua,
swap space is always almost free (148k used) and memory is not being
fully used (1919572k free as I'm writing this email)
all the processes showing in top are "httpd"s the first 11 processes
usually use 10-> 50% CPU usage, but those httpd rotate, and new ones
appear.
Eugene,
as mentioned before, my machine doesn't hit swap (148k swap used) which
i think is not worth mentioning.
How good is Turck mmCache?
Sincerely,
--
devnull@plugthebox.net <de...@plugthebox.net>
Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc. users forum
Posted by Joshua Slive <jo...@slive.ca>.
On 1/29/06, devnull@plugthebox.net <de...@plugthebox.net> wrote:
> Hello Joshua,
> Well the issue is that at peak times, the server doesn't respond, typing in SSH becomes sometimes slow, memory usage is fairly used (4GB of rams). The machine is a dual xeon 3.0 / SCSI hard disks. What do you mean by "disks maxed out" ?
>
> Mainly VBulletin is a php script. I don't serve much static html files. How can php be tuned to optimize its performance?
The most likely causes of problems are either being out of memory (and
therefore thrashing your disk with swap activity) or having disks that
cannot keep up with the read/write load. Check to see what your
processes are doing and what your memory load is using tools like
"top".
Joshua.
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000
conc. users forum
Posted by "devnull@plugthebox.net" <de...@plugthebox.net>.
Hello Joshua,
Well the issue is that at peak times, the server doesn't respond, typing
in SSH becomes sometimes slow, memory usage is fairly used (4GB of
rams). The machine is a dual xeon 3.0 / SCSI hard disks. What do you
mean by "disks maxed out" ?
Mainly VBulletin is a php script. I don't serve much static html files.
How can php be tuned to optimize its performance?
Sincerely,
--
devnull@plugthebox.net <de...@plugthebox.net>
Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc. users forum
Posted by Joshua Slive <jo...@slive.ca>.
On 1/29/06, devnull@plugthebox.net <de...@plugthebox.net> wrote:
> Dear List members,
> I'm the administrator of a big website that hosts an important forum
> (VBulletin to be precise). At peak time we get around 7000-9000
> concurrent users (counting the php sessions, members visiting the forum)
> the switch (Foundry) counts 2700 concurrent connections.
>
> during those peak times, the apache server (RHEL 4 AS, Apache 1.3, php)
> gets a load average of 80~170. the mysql server runs smoothly at 0.9 ~
> 3.
>
> Browsing the Internet / following some optimizations HOWTOs didn't help.
> Can anyone kindly support me on that issue?
You need to work on the diagnosis before you work on the cure. Load
average means almost nothing for a web server. What exactly is
concerning you? Are the responses slow? How is memory usage? Are
your disks maxed out?
In general, tuning apache itself won't get you very far (unless you
are serving mostly static files). You need to make sure you have
adequate resources for your site and perhaps tune php and your
database.
Joshua.
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc. users forum
Posted by Nick Kew <ni...@webthing.com>.
On Sunday 29 January 2006 22:39, devnull@plugthebox.net wrote:
> Dear List members,
> I'm the administrator of a big website that hosts an important forum
> (VBulletin to be precise). At peak time we get around 7000-9000
> concurrent users (counting the php sessions, members visiting the forum)
> the switch (Foundry) counts 2700 concurrent connections.
>
> during those peak times, the apache server (RHEL 4 AS, Apache 1.3, php)
> gets a load average of 80~170. the mysql server runs smoothly at 0.9 ~
> 3.
>
> Browsing the Internet / following some optimizations HOWTOs didn't help.
> Can anyone kindly support me on that issue?
Looking at a longer-term solution, you should migrate the application to
Apache 2.2, where the DBD architecture offers a major improvement in an
application of that kind.
I don't know whether PHP has made any effort to support DBD yet.
--
Nick Kew
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000
conc. users forum
Posted by "devnull@plugthebox.net" <de...@plugthebox.net>.
Keith,
About 58GB left. most of the logs are disabled btw.
Sincerely,
--
devnull@plugthebox.net <de...@plugthebox.net>
Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc.
users forum
Posted by ht...@karsites.net.
OK - how much free space do you have left on the hard
drives?
Keith
In theory, theory and practice are the same;
In practice they are not.
On Mon, 30 Jan 2006, devnull@plugthebox.net wrote:
> To: users@httpd.apache.org From: "devnull@plugthebox.net"
> <de...@plugthebox.net> Subject: Re: [users@httpd] high
> load average on Apache 1.3 hosting 8000 conc.
> users forum
>
> Keith,
> Dual Intel Xeon 3.0 / 4GB rams / 2x73GB SCSI RAID 1 mirrored
>
> Sincerely,
> --
> devnull@plugthebox.net <de...@plugthebox.net>
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Re: [users@httpd] high load average on Apache 1.3 hosting 8000
conc. users forum
Posted by "devnull@plugthebox.net" <de...@plugthebox.net>.
Keith,
Dual Intel Xeon 3.0 / 4GB rams / 2x73GB SCSI RAID 1 mirrored
Sincerely,
--
devnull@plugthebox.net <de...@plugthebox.net>
Re: [users@httpd] high load average on Apache 1.3 hosting 8000 conc.
users forum
Posted by ht...@karsites.net.
How much RAM does the machine have?
How many hard drives, what type and sizes are they?
Do you use RAID?
Keith
In theory, theory and practice are the same;
In practice they are not.
On Mon, 30 Jan 2006, devnull@plugthebox.net wrote:
> To: users@httpd.apache.org
> From: "devnull@plugthebox.net" <de...@plugthebox.net>
> Subject: [users@httpd] high load average on Apache 1.3 hosting 8000 conc.
> users forum
>
> Dear List members,
> I'm the administrator of a big website that hosts an important forum
> (VBulletin to be precise). At peak time we get around 7000-9000
> concurrent users (counting the php sessions, members visiting the forum)
> the switch (Foundry) counts 2700 concurrent connections.
>
> during those peak times, the apache server (RHEL 4 AS, Apache 1.3, php)
> gets a load average of 80~170. the mysql server runs smoothly at 0.9 ~
> 3.
>
> Browsing the Internet / following some optimizations HOWTOs didn't help.
> Can anyone kindly support me on that issue?
>
> Sincerely,
> --
> devnull@plugthebox.net <de...@plugthebox.net>
---------------------------------------------------------------------
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