查看服务的CPU利用率

01.获取服务的当前CPU份额（比如httpd）

# systemctl show -p CPUShares httpd.service

CPUShares=1024

注意：每个服务的默认值都为CPUShare = 1024.您可以增加/减少进程的CPU份额。

02.将服务的CPU份额（httpd.service）限制为2000 CPUShares /

# systemctl set-property httpd.service CPUShares=2000

# systemctl show -p CPUShares httpd.service

CPUShares=2000

注意：为服务设置CPUShare时，会创建一个名为service的目录（httpd.service.d），其中包含一个包含CPUShare Limit信息的文件90-CPUShares.conf。 您可以将文件视为：

# vi /etc/systemd/system/httpd.service.d/90-CPUShares.conf 

[Service]

CPUShares=2000 

03.检查服务的所有配置详细信息

# systemctl show httpd

Id=httpd.service

Names=httpd.service

Requires=basic.target

Wants=system.slice

WantedBy=multi-user.target

Conflicts=shutdown.target

Before=shutdown.target multi-user.target

After=network.target remote-fs.target nss-lookup.target systemd-journald.socket basic.target system.slice

Description=The Apache HTTP Server

LoadState=loaded

ActiveState=active

SubState=running

FragmentPath=/usr/lib/systemd/system/httpd.service

....

04.分析服务的关键链（httpd）

# systemd-analyze critical-chain httpd.service

The time after the unit is active or started is printed after the "@" character.

The time the unit takes to start is printed after the "+" character.

httpd.service +142ms

└─network.target @11.168s

└─network.service @9.456s +1.712s

└─NetworkManager.service @8.858s +596ms

└─firewalld.service @4.931s +3.926s

└─basic.target @4.916s

└─sockets.target @4.916s

└─dbus.socket @4.916s

└─sysinit.target @4.905s

└─systemd-update-utmp.service @4.864s +39ms

└─auditd.service @4.563s +301ms

└─systemd-tmpfiles-setup.service @4.485s +69ms

└─rhel-import-state.service @4.342s +142ms

└─local-fs.target @4.324s

└─boot.mount @4.286s +31ms

└─systemd-fsck@dev-disk-by/x2duuid-79f594ad/x2da332/x2d4730/x2dbb5f/x2d85d196080964.service @4.092s +149ms

└─dev-disk-by/x2duuid-79f594ad/x2da332/x2d4730/x2dbb5f/x2d85d196080964.device @4.092s

29.获取服务的依赖项列表（httpd）

# systemctl list-dependencies httpd.service

httpd.service

├─system.slice

└─basic.target

├─firewalld.service

├─microcode.service

├─rhel-autorelabel-mark.service

├─rhel-autorelabel.service

├─rhel-configure.service

├─rhel-dmesg.service

├─rhel-loadmodules.service

├─paths.target

├─slices.target

│ ├─-.slice

│ └─system.slice

├─sockets.target

│ ├─dbus.socket

....

05.按层次列出控制组

# systemd-cgls

├─1 /usr/lib/systemd/systemd --switched-root --system --deserialize 23

├─user.slice

│ └─user-0.slice

│ └─session-1.scope

│ ├─2498 sshd: root@pts/0 

│ ├─2500 -bash

│ ├─4521 systemd-cgls

│ └─4522 systemd-cgls

└─system.slice

├─httpd.service

│ ├─4440 /usr/sbin/httpd -DFOREGROUND

│ ├─4442 /usr/sbin/httpd -DFOREGROUND

│ ├─4443 /usr/sbin/httpd -DFOREGROUND

│ ├─4444 /usr/sbin/httpd -DFOREGROUND

│ ├─4445 /usr/sbin/httpd -DFOREGROUND

│ └─4446 /usr/sbin/httpd -DFOREGROUND

├─polkit.service

│ └─721 /usr/lib/polkit-1/polkitd --no-debug

....

06.根据CPU，内存，输入和输出列出控制组

# systemd-cgtop

Path Tasks %CPU Memory Input/s Output/s

/ 83 1.0 437.8M - -

/system.slice - 0.1 - - -

/system.slice/mariadb.service 2 0.1 - - -

/system.slice/tuned.service 1 0.0 - - -

/system.slice/httpd.service 6 0.0 - - -

/system.slice/NetworkManager.service 1 - - - -

/system.slice/atop.service 1 - - - -

/system.slice/atopacct.service 1 - - - -

/system.slice/auditd.service 1 - - - -

/system.slice/crond.service 1 - - - -

/system.slice/dbus.service 1 - - - -

/system.slice/firewalld.service 1 - - - -

/system.slice/lvm2-lvmetad.service 1 - - - -

/system.slice/polkit.service 1 - - - -

/system.slice/postfix.service 3 - - - -

/system.slice/rsyslog.service 1 - - - -

/system.slice/system-getty.slice/getty@tty1.service 1 - - - -

/system.slice/systemd-journald.service 1 - - - -

/system.slice/systemd-logind.service 1 - - - -

/system.slice/systemd-udevd.service 1 - - - -

/system.slice/webmin.service 1 - - - -

/user.slice/user-0.slice/session-1.scope 3 - - - -

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/59184.html