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Multi forum server optimization ?
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Multi forum server optimization ?
Hi,
I have got a server which is using as a free forum hosting server. My server has got only 320 MB ram (512 at the end of this week). I have got many database, one for each forum.
There is lstat graph:
System

Memory

CPU

You can also see status from phpmyadmin:
Status forum phpmyadmin
This is my.cnf:
# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#
# You can copy this file to
# /etc/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is /var/lib/mysql) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.
# The following options will be passed to all MySQL clients
[client]
#password = your_password
port = 3306
socket = /var/run/mysql/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3306
socket = /var/run/mysql/mysql.sock
skip-locking
key_buffer = 224M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 4M
net_buffer_length = 8K
read_buffer_size = 1M
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking
# Replication Master Server (default)
# binary logging is required for replication
log-bin
# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id = 1
# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
# the syntax is:
#
# CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
# MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
# where you replace <host>, <user>, <password> by quoted strings and
# <port> by the master's port number (3306 by default).
#
# Example:
#
# CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
# MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
# start replication for the first time (even unsuccessfully, for example
# if you mistyped the password in master-password and the slave fails to
# connect), the slave will create a master.info file, and any later
# change in this file to the variables' values below will be ignored and
# overridden by the content of the master.info file, unless you shutdown
# the slave server, delete master.info and restart the slaver server.
# For that reason, you may want to leave the lines below untouched
# (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id = 2
#
# The replication master for this slave - required
#master-host = <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user = <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password = <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port = <port>
#
# binary logging - not required for slaves, but recommended
#log-bin
# Point the following paths to different dedicated disks
#tmpdir = /tmp/
#log-update = /path-to-dedicated-directory/hostname
# Uncomment the following if you are using BDB tables
#bdb_cache_size = 4M
#bdb_max_lock = 10000
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql/
#innodb_log_arch_dir = /var/lib/mysql/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
I will be grateful for a help.
08-14-2006 09:21 PM
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Posts: 222
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Joined: May 2006
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RE: Multi forum server optimization ?
Please provide the output of "top" and "free -m" commands from ssh and I'll be able to better help with your optimizations.
If your httpd (apache) is on the same server, then please do let me know key settings such as TimeOut, KeepAlive, KeepAliveTimeout, MaxClients, Minspareservers and maxspareservers (from httpd.conf file).
08-15-2006 06:57 AM
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RE: Multi forum server optimization ?
TOP
top - 09:51:50 up 10 days, 19:58, 1 user, load average: 0.66, 1.02, 1.02
Tasks: 84 total, 1 running, 83 sleeping, 0 stopped, 0 zombie
Cpu(s): 5.2% user, 7.0% system, 0.0% nice, 87.8% idle
Mem: 320968k total, 316128k used, 4840k free, 22888k buffers
Swap: 248968k total, 56228k used, 192740k free, 43648k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14837 root 14 0 1084 1084 840 R 6.8 0.3 0:00.92 top
1434 nobody 11 0 7900 7884 5108 S 2.5 2.5 1:51.16 httpd
14842 mysql 10 0 138m 90m 2708 S 0.9 28.8 0:00.03 mysqld
1435 nobody 9 0 7924 7908 5112 S 0.6 2.5 1:31.25 httpd
8455 nobody 9 0 6744 6724 5144 S 0.6 2.1 0:25.96 httpd
1 root 8 0 72 64 44 S 0.0 0.0 0:03.58 init
2 root 9 0 0 0 0 S 0.0 0.0 0:00.02 keventd
3 root 19 19 0 0 0 S 0.0 0.0 0:00.61 ksoftirqd_CPU0
4 root 9 0 0 0 0 S 0.0 0.0 2:56.38 kswapd
5 root 9 0 0 0 0 S 0.0 0.0 0:00.00 bdflush
6 root 9 0 0 0 0 S 0.0 0.0 11:18.39 kupdated
7 root 9 0 0 0 0 S 0.0 0.0 0:00.00 ahc_dv_0
8 root 9 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_0
9 root 9 0 0 0 0 S 0.0 0.0 0:03.12 kreiserfsd
62 root 9 0 312 292 232 S 0.0 0.1 0:07.23 syslogd
65 root 9 0 196 184 184 S 0.0 0.1 0:00.03 klogd
221 root 8 0 156 132 100 S 0.0 0.0 0:00.40 inetd
225 root 9 0 756 600 512 S 0.0 0.2 0:17.38 sshd
233 root 8 0 376 352 292 S 0.0 0.1 0:00.53 crond
236 root 8 0 1256 744 580 S 0.0 0.2 0:05.63 sendmail
239 smmsp 8 0 776 360 252 S 0.0 0.1 0:00.05 sendmail
290 root 8 0 4804 4784 4744 S 0.0 1.5 0:29.60 httpd
301 root 8 0 4136 1536 716 S 0.0 0.5 0:33.64 lstatd
305 root 9 0 156 108 108 S 0.0 0.0 0:00.00 agetty
306 root 9 0 52 4 4 S 0.0 0.0 0:00.00 agetty
307 root 9 0 52 4 4 S 0.0 0.0 0:00.00 agetty
308 root 9 0 52 4 4 S 0.0 0.0 0:00.01 agetty
309 root 9 0 52 4 4 S 0.0 0.0 0:00.00 agetty
343 root 9 0 52 4 4 S 0.0 0.0 0:00.00 agetty
29413 nobody 9 0 612 484 460 S 0.0 0.2 0:00.00 in.identd
29415 nobody 8 0 612 484 460 S 0.0 0.2 0:00.09 in.identd
29416 nobody 9 0 612 484 460 S 0.0 0.2 0:00.20 in.identd
29417 nobody 9 0 612 484 460 S 0.0 0.2 0:00.14 in.identd
29418 nobody 9 0 612 484 460 S 0.0 0.2 0:00.14 in.identd
29419 nobody 9 0 612 484 460 S 0.0 0.2 0:00.08 in.identd
29420 nobody 9 0 612 484 460 S 0.0 0.2 0:00.00 in.identd
8051 root 9 0 3700 1552 960 S 0.0 0.5 0:02.06 miniserv.pl
free -m
total used free shared buffers cached
Mem: 313 306 7 0 15 35
-/+ buffers/cache: 255 57
Swap: 243 54 188
Apache 1.3.33
Timeout 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15
MaxClients 150
MinSpareServers 5
MaxSpareServers 10
08-15-2006 08:05 AM
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Posts: 222
Group: Administrators
Joined: May 2006
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RE: Multi forum server optimization ?
Make the following changes in your httpd.conf:
Timeout 30
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 4
MaxClients 150
MinSpareServers 5
MaxSpareServers 10
and the following in your my.cnf file:
# The following options will be passed to all MySQL clients
[client]
#password = your_password
port = 3306
socket = /var/run/mysql/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port = 3306
socket = /var/run/mysql/mysql.sock
skip-locking
key_buffer = 64M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 1M
join_buffer_size = 1M
net_buffer_length = 8K
read_buffer_size = 512K
read_rnd_buffer_size = 1M
myisam_sort_buffer_size = 8M
#log-bin
server-id = 1
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
Make sure to restart your apache and mysqld after making the changes.
08-15-2006 08:16 AM
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RE: Multi forum server optimization ?
Thx. I hope that key_buffer=64MB is enough 
Can you write me what that server-id = 1 means ?
And one more question: can I delete log files like ib_logfile0, ibdata1 ext. ?
08-15-2006 08:35 AM
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RE: Multi forum server optimization ?
64MB keybuffer should be enough. Since you're running low on ram, you can try to lower it even more and it will switch to disk writing instead of ram writing.
You need not worry about server-id and you can remove it if you want. It is used in mysql replication.
You may delete those log files if really needed.
08-15-2006 12:20 PM
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RE: Multi forum server optimization ?
One more question. What would you change if I have 512 MB ram ?
08-15-2006 12:27 PM
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Posts: 222
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RE: Multi forum server optimization ?
I don't think 512mb is a very big change. I would be give larger buffers for key_buffer, table_cache, read_rnd_buffer_size, sort_buffer_size and myisam_buffer_size if it was an upgrade to 1gb. Otherwise, if you wish, you can try increasing the value of these settings a bit. All they can offer is "more speed" as long as your system has enough memory to support the high value or else they will rather slow down your system.
08-15-2006 09:29 PM
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RE: Multi forum server optimization ?
How about using query_cache_size ? Should I use it ?
08-16-2006 07:21 AM
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Posts: 222
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RE: Multi forum server optimization ?
You cannot use it when you have so less ram and then again query cache isn't really very helpful on the dynamic environment of forums.
08-16-2006 01:09 PM
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