我有一个wordpress新闻门户和easyengine+wp+redis，来了几天的性能问题，我的mysql是消耗大量的cpu使用我有超过500k的帖子有人帮我解决这个问题？
打印cpuhttps://prnt.sc/jgkpwy
服务器详细信息ubuntu 16.04-最小-raid1硬盘256 gb ssd 2.5“硬盘256 gb ssd 2.5”ram 32 gb cpu intel xeon e3-1225v3
mysql配置my.cnf

# MariaDB database server configuration file.

# 

# You can copy this file 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
lc_messages	= en_US
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

# 

max_connections		= 300
connect_timeout		= 5
wait_timeout		= 600
max_allowed_packet	= 16M
thread_cache_size       = 500
sort_buffer_size	= 4M
bulk_insert_buffer_size	= 16M
tmp_table_size		= 32M
max_heap_table_size	= 32M

# 

# * MyISAM

# 

# This replaces the startup script and checks MyISAM tables if needed

# the first time they are touched. On error, make copy and try a repair.

myisam_recover_options = BACKUP
key_buffer_size		= 128M

# open-files-limit	= 2000

table_open_cache	= 600
myisam_sort_buffer_size	= 512M
concurrent_insert	= 2
read_buffer_size	= 2M
read_rnd_buffer_size	= 1M

# 

# * Query Cache Configuration

# 

# Cache only tiny result sets, so we can fit more in the query cache.

query_cache_limit		= 2M
query_cache_size		= 256M
query_cache_strip_comments =1

# for more write intensive setups, set to DEMAND or OFF

query_cache_type		= 1

# 

# * 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             = 1

# 

# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.

# 

# we do want to know about network errors and such

log_warnings		= 2

# 

# Enable the slow query log to see queries with especially long duration

# slow_query_log[={0|1}]

slow_query_log_file	= /var/log/mysql/mariadb-slow.log
long_query_time = 10

# log_slow_rate_limit	= 1000

log_slow_verbosity	= query_plan

# log-queries-not-using-indexes

# log_slow_admin_statements

# 

# 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

# report_host		= master1

# auto_increment_increment = 2

# auto_increment_offset	= 1

# log_bin			= /var/log/mysql/mariadb-bin

# log_bin_index		= /var/log/mysql/mariadb-bin.index

# not fab for performance, but safer

# sync_binlog		= 1

# expire_logs_days	= 10

# max_binlog_size         = 100M

# slaves

# relay_log		= /var/log/mysql/relay-bin

# relay_log_index	= /var/log/mysql/relay-bin.index

# relay_log_info_file	= /var/log/mysql/relay-bin.info

# log_slave_updates

# read_only

# 

# If applications support it, this stricter sql_mode prevents some

# mistakes like inserting invalid dates etc.

# sql_mode		= NO_ENGINE_SUBSTITUTION,TRADITIONAL

# 

# * 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!

default_storage_engine	= InnoDB

# you can't just change log file size, requires special procedure

# innodb_log_file_size	= 50M

innodb_buffer_pool_size	= 15G
innodb_log_buffer_size	= 16M
innodb_file_per_table	= 1
innodb_open_files	= 400
innodb_io_capacity	= 400
innodb_flush_method	= O_DIRECT
innodb_buffer_pool_instances	= 15

# 

# * 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

# 

# * Galera-related settings

# 

[galera]

# Mandatory settings

# wsrep_on=ON

# wsrep_provider=

# wsrep_cluster_address=

# binlog_format=row

# default_storage_engine=InnoDB

# innodb_autoinc_lock_mode=2

# 

# Allow server to accept connections on all interfaces.

# 

# bind-address=0.0.0.0

# 

# Optional setting

# wsrep_slave_threads=1

# innodb_flush_log_at_trx_commit=0

[mysqldump]
quick
quote-names
max_allowed_packet	= 16M

[mysql]

# no-auto-rehash	# faster start of mysql but no tab completion

[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/