Как понять, почему mysql ест очень много CPU? Здравствуйте.
Недавно переехали на новый сервер, сервис начал рости и при относительно небольшом увеличении количества онлайна сервис начал заметно подтормаживать. Загрузка страницы занимает 20-30 секунд, что не есть хорошо.
top показывает, что mysql ест больше всего памяти, практически всю. Использовал mysqltuner, всё стало хорошо, но спустя 2-3 дня снова начались проблемы.
Прикладываю конфиг my.cnf, графики munin'a и советы mysqltuner'a.
Mysql: Ver 8.42 Distrib 5.5.44, for debian-linux-gnu on x86_64
Дополню вопрос любыми сведениями, которые необходимы.
Надеюсь на помощь и развёрнутый ответ, дабы знать что и как следует делать правильно.
Munin: socpult.ru/_munin/Munin.html
Конфиг: # The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
wait_timeout = 30
interactive_timeout = 30
tmp_table-size = 200M
max_heap_table_size = 200M
#skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 256M
key_buffer_size = 10M
max_allowed_packet = 8M
thread_stack = 192K
thread_cache_size = 16
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
max_connections = 1200
open_files_limit = 4000
character-set-server = utf8
table_cache = 2048
read_buffer_size = 64K
read_rnd_buffer_size = 2M
sort_buffer_size = 8M
thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 400M
query_cache_size = 300M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
general_log_file = /var/log/mysql/mysql.log
general_log = 8
#
# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.
#
# Here you can see queries with especially long duration
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 1
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
innodb_buffer_pool_size = 50GB
innodb_additional_mem_pool_size = 20485760
innodb_thread_concurrency = 6
innodb_flush_log_at_trx_commit = 0
innodb_flush_method = O_DIRECT
innodb_log_file_size = 64M
innodb_log_buffer_size = 32M
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
[mysqldump]
quick
quote-names
max_allowed_packet = 16M

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