我最近得到了新硬件，但我遇到了mysql的问题。它比旧服务器上的速度慢。当我在新服务器上运行sysbench工具时，我得到了这个：
sysbench --test=oltp --oltp-table-size=1000000 --mysql-db=test --mysql-user=root --mysql-password= --max-time=60 --oltp-read-only=on --max-requests=0 --num-threads=8 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
No DB drivers specified, using mysql
Running the test with following options:
Number of threads: 8
Doing OLTP test.
Running mixed OLTP test
Doing read-only test
Using Special distribution (12 iterations, 1 pct of values are returned in 75 pct cases)
Using "BEGIN" for starting transactions
Using auto_inc on the id column
Threads started!
Time limit exceeded, exiting...
(last message repeated 7 times)
Done.
OLTP test statistics:
queries performed:
read: 365694
write: 0
other: 52242
total: 417936
transactions: 26121 (435.14 per sec.)
deadlocks: 0 (0.00 per sec.)
read/write requests: 365694 (6091.93 per sec.)
other operations: 52242 (870.28 per sec.)
Test execution summary:
total time: 60.0293s
total number of events: 26121
total time taken by event execution: 479.9747
per-request statistics:
min: 0.52ms
avg: 18.38ms
max: 117.91ms
approx. 95 percentile: 53.21ms
Threads fairness:
events (avg/stddev): 3265.1250/19.37
execution time (avg/stddev): 59.9968/0.01
旧服务器产生了这个：
sysbench --test=oltp --oltp-table-size=1000000 --mysql-db=test --mysql-user=root --mysql-password= --max-time=60 --oltp-read-only=on --max-requests=0 --num-threads=8 run
sysbench 0.4.12: multi-threaded system evaluation benchmark
No DB drivers specified, using mysql
Running the test with following options:
Number of threads: 8
Doing OLTP test.
Running mixed OLTP test
Doing read-only test
Using Special distribution (12 iterations, 1 pct of values are returned in 75 pct cases)
Using "BEGIN" for starting transactions
Using auto_inc on the id column
Threads started!
Time limit exceeded, exiting...
(last message repeated 7 times)
Done.
OLTP test statistics:
queries performed:
read: 952294
write: 0
other: 136042
total: 1088336
transactions: 68021 (1133.58 per sec.)
deadlocks: 0 (0.00 per sec.)
read/write requests: 952294 (15870.18 per sec.)
other operations: 136042 (2267.17 per sec.)
Test execution summary:
total time: 60.0052s
total number of events: 68021
total time taken by event execution: 479.5141
per-request statistics:
min: 3.27ms
avg: 7.05ms
max: 31.63ms
approx. 95 percentile: 8.60ms
Threads fairness:
events (avg/stddev): 8502.6250/11.10
execution time (avg/stddev): 59.9393/0.00
旧服务器有E3-1230 cpu和16GB内存。新服务器有E5-1660 v3和32GB内存。 OS两者都是debian wheezy，而mysql版本是5.5.43。 My.cnf在下面
#
# 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
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 = 256M
sort_buffer_size = 2M
read_rnd_buffer_size = 4M
innodb_buffer_pool_size = 1G
max_allowed_packet = 32M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
max_connections = 300
table_cache = 256M
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 200M
#
# * 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 log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#slow_query_log_file = /var/log/mysql/mysql-slow.log
#slow_query_log = 1
#long_query_time = 2
#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
[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/
有什么想法吗？
答案 0 :(得分：1)
query_cache_size = 200M
关闭查询缓存。即使您选择继续使用，也不要因为修剪成本而将尺寸设置为大于50M。
table_cache = 256M
哎哟！你不需要25亿桌！改为几百（没有后缀）。
在两台机器上执行此操作，然后区分输出：
SHOW VARIABLES LIKE 'innodb%';
有些默认值随时间而变化;这应该指出它们。
答案 1 :(得分：0)
同意Rick你的配置可能不是最佳的，但如果你真的在两台机器上运行相同的mysql配置，那么这并不能解释这种差异。所有可能的原因都需要很长时间才能列出。假设你在两个系统（冷缓存）上以相同的方式收集统计信息，那么最可能的原因是IO相关，你可以使用磁盘基准测试工具验证这一点 - 如果你还没有你知道的东西，我会推荐afio适合这项任务的井。 Fixing the problem是一个更复杂的问题。