Hi Graham!

> What percentage of requests are actually yielding static pages?
> People often too quickly run to lighttpd thinking it will somehow
> magically solve all their problems, but if the bulk of the requests
> are actually dynamic and served by Django, and it is Django and the
> database which are the bottleneck, it will make very little if any
> difference.

Ok,

> Now to try and get to what the real issue may be, expand on what you
> mean by 'server stuck when I had too much hits'.

I couldn´t figure out exactly my problem. The key pages of my site is
cached through locmen, the index page is cron generated. I have too
much media files, my site is a games portal and I have videos, images
and stuff served on the same server, a Dual Intel(R) Xeon(TM) CPU
3.20GHz with 4GB of RAM space. I have the following installation:

* Apache2.2
* Python-2.4.2
* Django-0.96pre served through mod_python
* MySQLdb-1.2.2
* MySQL-5.0.18

At some key pages I use django´s locmen cache. My home page is
somewhat slow because it has too many interchains of news sections
(too much filtering), this way, I generate the home page every 30
minutes and serve it as a static page. I start this approach this
week, in the past time I let the home page to be cached by locmen too.

My RAM usage frequently reaches 3GB or more, I can´t tell it uses the
swap
space frequently. Last days, when the server is slow, a `top` tells me
that
processing is at high levels (60% to 90%).

At this exact moment, when I have a big number of users accessing my
page the server seems stable.

top - 17:46:48 up  4:27,  2 users,  load average: 0.22, 0.52, 0.66
Tasks: 117 total,   1 running, 116 sleeping,   0 stopped,   0 zombie
Cpu(s):  7.1% us,  0.7% sy,  0.0% ni, 91.8% id,  0.1% wa,  0.1% hi,
0.2% si
Mem:   4045568k total,  2250328k used,  1795240k free,    55536k
buffers
Swap:  2104472k total,        0k used,  2104472k free,  1374412k
cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2632 wwwrun    15   0  157m  28m 3996 S   12  0.7   0:00.70 httpd2-
prefork
 2634 wwwrun    15   0  157m  29m 4044 S   10  0.7   0:00.83 httpd2-
prefork
 2553 wwwrun    15   0  160m  31m 4080 S    3  0.8   0:01.96 httpd2-
prefork
 2434 wwwrun    15   0  171m  42m 4076 S    3  1.1   0:06.69 httpd2-
prefork
 2907 mysql     15   0  130m  28m 5116 S    2  0.7  14:31.15 mysqld
 2313 wwwrun    15   0  160m  31m 4088 S    0  0.8   0:03.40 httpd2-
prefork
 2449 wwwrun    15   0  161m  33m 5324 S    0  0.9   0:03.01 httpd2-
prefork
 ...

A friend told me that I can make python library shared. I read the
Jacob´s post [1] about performance tips and the Chase Davis [2]
recomendations. I get another box to make server scaling, it is a
Pentium 4 CPU 3.4GHz with 2GB of RAM space. What is the best
alternative to this server? Should I use it as a database server or
should I use it as a media files server, or maybe I should use it for
apache and the another server for database...

I had problems like the about 2 months ago and I updated the python
mysql library (my last one had a bug with garbage collection), and the
server goes ok for these 2 months, it start to show me problems again
when I had an increment of users. I could not tell how many was this
increment, but on monday I launch a new online game (it is served on a
partner) and I could measure the incrementation of users on site by
the forum and other interactive sections. The server stopped to run
again today just after I change a header file used by this webgame
(the webgame is hosted by another server, but the header is on my
server), but I don´t know if it is a pertinent information :P

I am very thankfull for all your help,
Best regards.

[1] http://www.jacobian.org/writing/2005/dec/12/django-performance-tips/
[2] http://www.car-chase.net/2007/apr/30/django-deployment-lessons-learned/

--
Michel Thadeu Sabchuk
MisterApe


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