我已经从 Scalr 的 AMI 启动了一个服务器。Top 一直显示 ~1.4。我预计它会像我之前使用的所有服务器一样为 0。该服务器在 ubuntu-10-04 上运行 mysql 5.1
您可以在下面找到 TOP 输出。
服务器出了什么问题？如何找出导致 CPU 消耗大的原因？
编辑：流程如下：
57 testuser 85.45.44.74:37833 cbar 睡眠 1299
63 testuser 85.45.44.74:40814 cbar 睡眠 81
64 testuser 85.45.44.74:40815 cbar 查询 0 显示完整进程列表
以下是最消耗记忆力的
509 mysql 20 0 482m 370m 4084 S 0 21.3 17:25.74 mysqld
537 root 20 0 38060 12m 2096 S 0 0.7 0:00.20 scalarizr
471 root 20 0 57432 11m 2964 S 0 0.7 0:00.32 scalarizr
514 root 20 0 8776 3008 2340 S 0 0.2 0:00.14 sshd
585 root 20 0 20940 2916 1832 S 0 0.2 0:00.02 console-kit-dae
1744 root 20 0 4588 1912 1524 S 0 0.1 0:00.02 bash
1 root 20 0 2808 1392 1108 S 0 0.1 0:00.14 init
395 syslog 20 0 34672 1204 932 S 0 0.1 0:00.03 rsyslogd
1985 root 20 0 2540 1188 940 R 0 0.1 0:00.00 top
476 root 20 0 2400 924 732 S 0 0.1 0:00.00 cron
419 root 20 0 5572 852 532 S 0 0.0 0:00.00 sshd
-
Jtop - 15:32:19 up 3:33, 1 user, load average: 1.28, 1.28, 1.22
Tasks: 76 total, 1 running, 75 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.0%us, 0.4%sy, 0.0%ni, 93.0%id, 2.1%wa, 0.0%hi, 0.0%si, 0.4%st
Mem: 1781976k total, 1715924k used, 66052k free, 13300k buffers
Swap: 917496k total, 1696k used, 915800k free, 1233484k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 2808 1392 1108 S 0 0.1 0:00.14 init
2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0
4 root 20 0 0 0 0 S 0 0.0 0:00.00 ksoftirqd/0
5 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0
6 root 20 0 0 0 0 S 0 0.0 0:00.01 events/0
7 root 20 0 0 0 0 S 0 0.0 0:00.00 cpuset
8 root 20 0 0 0 0 S 0 0.0 0:00.00 khelper
9 root 20 0 0 0 0 S 0 0.0 0:00.00 netns
10 root 20 0 0 0 0 S 0 0.0 0:00.00 async/mgr
11 root 20 0 0 0 0 S 0 0.0 0:00.00 xenwatch
12 root 20 0 0 0 0 S 0 0.0 0:00.00 xenbus
14 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/1
15 root 20 0 0 0 0 S 0 0.0 0:00.00 ksoftirqd/1
16 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/1
17 root 20 0 0 0 0 S 0 0.0 0:00.00 events/1
18 root 20 0 0 0 0 S 0 0.0 0:00.00 sync_supers
19 root 20 0 0 0 0 S 0 0.0 0:00.00 bdi-default
20 root 20 0 0 0 0 S 0 0.0 0:00.00 kintegrityd/0
21 root 20 0 0 0 0 S 0 0.0 0:00.00 kintegrityd/1
22 root 20 0 0 0 0 S 0 0.0 0:00.00 kblockd/0
23 root 20 0 0 0 0 S 0 0.0 0:00.00 kblockd/1
24 root 20 0 0 0 0 S 0 0.0 0:00.00 kseriod
27 root 20 0 0 0 0 S 0 0.0 0:00.00 khungtaskd
29 root 20 0 0 0 0 S 0 0.0 0:00.95 kswapd0
30 root 20 0 0 0 0 S 0 0.0 0:00.00 aio/0
31 root 20 0 0 0 0 S 0 0.0 0:00.00 aio/1
32 root 20 0 0 0 0 S 0 0.0 0:00.00 jfsIO
33 root 20 0 0 0 0 S 0 0.0 0:00.00 jfsCommit
34 root 20 0 0 0 0 S 0 0.0 0:00.00 jfsCommit
35 root 20 0 0 0 0 S 0 0.0 0:00.00 jfsSync
36 root 20 0 0 0 0 S 0 0.0 0:00.00 xfs_mru_cache
37 root 20 0 0 0 0 S 0 0.0 0:00.00 xfslogd/0
38 root 20 0 0 0 0 S 0 0.0 0:00.00 xfslogd/1
39 root 20 0 0 0 0 S 0 0.0 0:00.00 xfsdatad/0
40 root 20 0 0 0 0 S 0 0.0 0:00.00 xfsdatad/1
41 root 20 0 0 0 0 S 0 0.0 0:00.00 xfsconvertd/0
42 root 20 0 0 0 0 S 0 0.0 0:00.00 xfsconvertd/1
43 root 20 0 0 0 0 S 0 0.0 0:00.00 glock_workqueue
44 root 20 0 0 0 0 S 0 0.0 0:00.00 glock_workqueue
45 root 20 0 0 0 0 S 0 0.0 0:00.00 delete_workqueu
46 root 20 0 0 0 0 S 0 0.0 0:00.00 delete_workqueu
47 root 15 -5 0 0 0 S 0 0.0 0:00.00 kslowd000
48 root 15 -5 0 0 0 S 0 0.0 0:00.00 kslowd001
49 root 20 0 0 0 0 S 0 0.0 0:00.00 crypto/0
50 root 20 0 0 0 0 S 0 0.0 0:00.00 crypto/1
53 root 20 0 0 0 0 S 0 0.0 0:00.00 net_accel/0
54 root 20 0 0 0 0 S 0 0.0 0:00.00 net_accel/1
55 root 20 0 0 0 0 S 0 0.0 0:00.00 sfc_netfront/0
56 root 20 0 0 0 0 S 0 0.0 0:00.00 sfc_netfront/1
57 root 20 0 0 0 0 S 0 0.0 0:00.00 kstriped
58 root 20 0 0 0 0 S 0 0.0 0:00.01 kjournald
86 root 20 0 2340 628 624 S 0 0.0 0:00.05 upstart-udev-br
88 root 16 -4 2340 344 340 S 0 0.0 0:00.03 udevd
172 root 18 -2 2336 392 368 S 0 0.0 0:00.00 udevd
173 root 18 -2 2336 308 304 S 0 0.0 0:00.00 udevd
310 root 20 0 0 0 0 S 0 0.0 0:00.10 flush-8:1
324 root 20 0 2256 140 136 S 0 0.0 0:00.00 dhclient3
365 root 20 0 0 0 0 S 0 0.0 0:00.00 kjournald
368 root 20 0 0 0 0 S 0 0.0 0:00.03 kjournald
395 syslog 20 0 34672 1204 932 S 0 0.1 0:00.03 rsyslogd
411 messageb 20 0 2688 776 644 S 0 0.0 0:00.00 dbus-daemon
419 root 20 0 5572 852 532 S 0 0.0 0:00.00 sshd
471 root 20 0 57432 11m 2964 S 0 0.7 0:00.28 scalarizr
476 root 20 0 2400 924 732 S 0 0.1 0:00.00 cron
477 daemon 20 0 2272 444 304 S 0 0.0 0:00.00 atd
493 root 0 -20 0 0 0 S 0 0.0 0:00.00 loop0
499 root 20 0 0 0 0 S 0 0.0 0:00.00 kjournald
509 mysql 20 0 481m 368m 3760 S 0 21.2 17:24.94 mysqld
514 root 20 0 8776 3008 2340 S 0 0.2 0:00.10 sshd
537 root 20 0 38060 12m 2096 S 0 0.7 0:00.18 scalarizr
585 root 20 0 20940 2916 1832 S 0 0.2 0:00.02 console-kit-dae
763 root 20 0 1812 544 468 S 0 0.0 0:00.00 getty
804 root 20 0 2024 660 544 S 0 0.0 0:00.00 sftp-server
#
# 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]
log_bin = /mnt/dbstorage/mysql-misc/binlog.log
#
# * Basic Settings
#
#
# * IMPORTANT
# If you make changes to these settings and your system uses apparmor, you may
# also need to also adjust /etc/apparmor.d/usr.sbin.mysqld.
#
user = mysql
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /mnt/dbstorage/mysql-data/
tmpdir = /tmp
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 = 300M
max_allowed_packet = 16M
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 = 200
max_heap_table_size = 50000000
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * 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
log_error = /var/log/mysql/error.log
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#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/
!include /etc/mysql/farm-replication.cnf
答案1
根据上面的评论，MySQL 似乎正在消耗内存。显示上面的完整进程列表，看看它是否正在执行任何操作，如果没有，只需重新启动 MySQL 即可解决问题。如果仍然没有帮助，my.cnf 的内容将帮助我们进一步诊断。
答案2
由于这是一台服务器，是否有其他机器正在向其发出请求？也许几分钟前有一连串的外部调用。这可能解释了 mysql 的使用情况，但没有显示其他进程正在使用 CPU。
既然您关心的是 top 在这台机器上显示的内容与其他机器上的差异，那么这里的差异是什么：这是一台单处理器机器还是磁盘速度比其他机器慢？或者这是不同版本的 Ubuntu？提供两台机器的 cpuinfo 和系统版本信息可以解决这些问题。