Optimize ISPC3 for low resource systems

[schildhans]

Hi,

I love your Software and it works great but now I have to optimize it
for my low-resource VPS with 512MB Memory.
I think for mySql I did the right thing with the following values:

#
# * Fine Tuning
#
key_buffer = 1M
max_allowed_packet = 8M
thread_stack = 64K
thread_cache_size = 8
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 8M

i disabled also the myDNS and removed it from the startup scripts as I dont need it.
With this modifications my system uses 360 MB memory (without apache started).
When I start apache it uses 433 MB, which is also fine for me.
But when I go to the loginpage of roundcube on my host it uses already 558MB, which is way to much for a single user accessing a single php script.
When I log in it gets wors and the system uses 630MB Ram.
How is this behaviour possible?
The website in ISPC is set to use fast-cgi for php. I already
tried to tweak apache2 to use less memory by setting

<IfModule mpm_prefork_module>
    StartServers         12
    MinSpareServers      12
    MaxSpareServers      24
    MaxClients          100
    MaxRequestsPerChild   0
</IfModule>

But I think there is something strange here.
If I use apachebench to simulate 25 requests, I have to reboot the system because it can't allocate more memory. Even top on the shell gives a fork exception.
The VPS is done with OpenVZ with 512Ram and 700 burstable, bt I can't use Swap space.

Anybody an idea on how to configure apache so that it can handle actually more than one person?

schildhans

[till]

I love your Software and it works great but now I have to optimize it

First, this has nothing to do with ispconfig itself or that your system uses ispconfig.
ISPConfig itself does not use any permanent resources on your system as it is no daemon.

A VPS with only 512 MB RAM and without swap is a bit too low for a hosting and mail server.

What <ou can try is to use this:

<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 100
MaxRequestsPerChild 0
</IfModule>

and then remove all unneeded php modules and use mod_php instead of fcgi. You can also disable all apache modules that you dont then need like fcgi and suphp.

[schildhans]

Hi,
thanks for your reply. The settings for apache helped a little bit.
Now I found out that amavis-new and spamd use much of my memory:

srv:~# python ps_mem.py 
 Private  +   Shared  =  RAM used	Program 

 84.0 KiB +  13.0 KiB =  97.0 KiB	logger
128.0 KiB +  16.0 KiB = 144.0 KiB	portmap
160.0 KiB +  37.0 KiB = 197.0 KiB	init
228.0 KiB +  55.0 KiB = 283.0 KiB	cron
376.0 KiB +  31.0 KiB = 407.0 KiB	famd
388.0 KiB +  27.5 KiB = 415.5 KiB	pure-ftpd-mysql-virtualchroot
336.0 KiB +  95.0 KiB = 431.0 KiB	pickup
340.0 KiB +  94.0 KiB = 434.0 KiB	showq
348.0 KiB + 100.0 KiB = 448.0 KiB	couriertcpd (4)
396.0 KiB +  64.0 KiB = 460.0 KiB	courierlogger (5)
380.0 KiB +  93.5 KiB = 473.5 KiB	master
420.0 KiB +  83.5 KiB = 503.5 KiB	freshclam
260.0 KiB + 247.5 KiB = 507.5 KiB	mysqld_safe
500.0 KiB +  54.5 KiB = 554.5 KiB	ntpd
556.0 KiB + 194.0 KiB = 750.0 KiB	qmgr
552.0 KiB + 247.5 KiB = 799.5 KiB	bash
748.0 KiB + 198.5 KiB = 946.5 KiB	tlsmgr
  1.1 MiB + 206.5 KiB =   1.3 MiB	vlogger
  1.2 MiB + 358.5 KiB =   1.5 MiB	sshd (2)
  1.5 MiB + 103.0 KiB =   1.6 MiB	proplay_resdaem
  1.3 MiB + 354.5 KiB =   1.7 MiB	smtpd
  1.7 MiB +  39.0 KiB =   1.7 MiB	syslog-ng
  1.5 MiB + 408.5 KiB =   1.9 MiB	saslauthd (5)
  1.4 MiB + 535.5 KiB =   1.9 MiB	authdaemond (6)
  2.1 MiB + 827.0 KiB =   2.9 MiB	imapd (10)
  2.7 MiB + 467.5 KiB =   3.2 MiB	fail2ban-server
  5.3 MiB + 839.0 KiB =   6.1 MiB	couriertls (10)
 19.2 MiB + 141.0 KiB =  19.4 MiB	mysqld
  4.9 MiB +  23.6 MiB =  28.5 MiB	spamd (3)
 54.5 MiB +   8.5 MiB =  63.1 MiB	apache2 (12)
 66.9 MiB +  79.0 KiB =  67.0 MiB	clamd
 64.9 MiB +  25.6 MiB =  90.6 MiB	amavisd-new (3)
---------------------------------
                        300.0 MiB
=================================

 Private  +   Shared  =  RAM used	Program

After restarting amavisd freed about 40mb of my memory:

srv:~# python ps_mem.py 
 Private  +   Shared  =  RAM used	Program 

 84.0 KiB +  14.0 KiB =  98.0 KiB	logger
128.0 KiB +  16.0 KiB = 144.0 KiB	portmap
160.0 KiB +  37.0 KiB = 197.0 KiB	init
228.0 KiB +  56.0 KiB = 284.0 KiB	cron
256.0 KiB +  42.0 KiB = 298.0 KiB	freshclam
376.0 KiB +  31.0 KiB = 407.0 KiB	famd
388.0 KiB +  27.5 KiB = 415.5 KiB	pure-ftpd-mysql-virtualchroot
336.0 KiB +  95.0 KiB = 431.0 KiB	pickup
340.0 KiB +  94.0 KiB = 434.0 KiB	showq
348.0 KiB + 100.0 KiB = 448.0 KiB	couriertcpd (4)
396.0 KiB +  68.0 KiB = 464.0 KiB	courierlogger (5)
380.0 KiB +  94.5 KiB = 474.5 KiB	master
260.0 KiB + 247.5 KiB = 507.5 KiB	mysqld_safe
500.0 KiB +  55.5 KiB = 555.5 KiB	ntpd
556.0 KiB + 199.0 KiB = 755.0 KiB	qmgr
560.0 KiB + 247.5 KiB = 807.5 KiB	bash
752.0 KiB + 199.5 KiB = 951.5 KiB	tlsmgr
  1.1 MiB + 246.5 KiB =   1.3 MiB	vlogger
  1.2 MiB + 359.5 KiB =   1.5 MiB	sshd (2)
  1.5 MiB + 113.0 KiB =   1.6 MiB	proplay_resdaem
  1.3 MiB + 360.5 KiB =   1.7 MiB	smtpd
  1.7 MiB +  40.0 KiB =   1.7 MiB	syslog-ng
  1.5 MiB + 408.5 KiB =   1.9 MiB	saslauthd (5)
  1.4 MiB + 629.5 KiB =   2.0 MiB	authdaemond (6)
  2.1 MiB + 834.0 KiB =   2.9 MiB	imapd (10)
  2.7 MiB + 468.5 KiB =   3.2 MiB	fail2ban-server
  5.3 MiB + 839.0 KiB =   6.1 MiB	couriertls (10)
 19.2 MiB + 146.0 KiB =  19.4 MiB	mysqld
  4.9 MiB +  23.7 MiB =  28.7 MiB	spamd (3)
  8.1 MiB +  42.2 MiB =  50.3 MiB	amavisd-new (3)
 54.5 MiB +   8.6 MiB =  63.1 MiB	apache2 (12)
 66.2 MiB +  31.5 KiB =  66.2 MiB	clamd
---------------------------------
                        259.1 MiB
=================================

 Private  +   Shared  =  RAM used	Program

Currently I have a cron running every day to restart amavis since searching the web I found out that amavisd seems to be known for its heavy memory usage and there is not much to tweak there.
Is there a easy way to temporarly disable amavis & clam-av so that I can see how my mailsystem works without virus scanning. The only thing I need is spamassassin.
Because for weeks now the clamav log did not show any viruses beeing catched.

[till]

Spamassassin is part of amavisd, so if you disable amavisd you disable all spam and antivirus scanning.

to disable amavisd, comment out the line:

content_filter = amavis:[127.0.0.1]:10024

in main.cf and then restart postfix.