- 展示层级结构
$ systemd-cgls
Control group /:
-.slice
├─845 bpfilter_umh
├─user.slice
│ └─user-1000.slice
│ ├─user@1000.service …
│ │ ├─gsd-xsettings.service
│ │ │ └─1521 /usr/libexec/gsd-xsettings
│ │ ├─gvfs-goa-volume-monitor.service
│ │ │ └─974 /usr/libexec/gvfs-goa-volume-monitor
│ │ ├─gsd-power.service
│ │ │ └─1497 /usr/libexec/gsd-power
│ │ ├─xdg-permission-store.service
│ │ │ └─1412 /usr/libexec/xdg-permission-store
│ │ ├─gsd-sound.service
│ │ │ └─1511 /usr/libexec/gsd-sound
...
│ └─23630 pager
├─init.scope
│ └─1 /sbin/init splash
└─system.slice
├─irqbalance.service
│ └─627 /usr/sbin/irqbalance --foreground
├─containerd.service …
│ ├─ 762 /usr/bin/containerd
│ ├─23451 /usr/bin/containerd-shim-runc-v2 -namespace default -id mybox1 -address /run/containerd/containerd.sock
│ └─23471 /bin/sh- 展示资源配置
Control Group Tasks %CPU Memory Input/s Output/s
user.slice 276 1.2 1.0G - -
/ 582 1.0 2.2G - -
system.slice 173 0.2 946.6M - -
system.slice/containerd.service 36 0.2 90.5M - -
system.slice/irqbalance.service 2 0.1 744.0K - -
default 1 - 1.7M - -
default/mybox1 1 - 260.0K - -
system.slice/ModemManager.service 3 - 7.0M - -
system.slice/NetworkManager.service 3 - 12.5M - -
system.slice/accounts-daemon.service 3 - 6.7M - -
system.slice/acpid.service 1 - 352.0K - -
system.slice/avahi-daemon.service 2 - 1.4M - -
system.slice/boot-efi.mount - - 24.0K - -
system.slice/colord.service 3 - 20.5M - -
system.slice/cron.service 1 - 492.0K - -
system.slice/cups-browsed.service 3 - 1.9M - -
system.slice/cups.service 1 - 1.9M - -
system.slice/dbus.service 1 - 4.5M - -
system.slice/dev-hugepages.mount - - 64.0K - -
system.slice/dev-mqueue.mount - - 4.0K - -
system.slice/docker.service 18 - 134.4M - -
system.slice/docker.socket - - 4.0K - -
system.slice/fwupd.service 5 - 5.1M - -
system.slice/gdm.service 3 - 6.0M - -
system.slice/kerneloops.service 2 - 1.2M - -
system.slice/libvirtd.service 19 - 30.6M - -
system.slice/libvirtd.socket - - 4.0K - -
system.slice/networkd-dispatcher.service 1 - 19.1M - -
system.slice/nmbd.service 1 - 11.2M - -
system.slice/polkit.service 3 - 6.6M - -
system.slice/rsyslog.service 4 - 2.9M - -
system.slice/rtkit-daemon.service 3 - 588.0K - -
system.slice/smbd.service 5 - 16.6M - -
system.slice/snap-bare-5.mount - - 160.0K - -
system.slice/snap-core18-2074.mount - - 12.0K - -
system.slice/snap-core18-2128.mount - - 176.0K - -
system.slice/snap-gnome\x2d3\x2d34\x2d1804-66.mount - - 8.0K - -
system.slice/snap-gnome\x2d3\x2d34\x2d1804-72.mount - - 8.0K - - #创建控制群组
$ cgcreate -g cpu:/g1
说明：这个命令会创建/sys/fs/cgroup/cpu/g1目录出来，在这个目录下有各种cgroup cpu的配置文件;
- #设置CPU限制参数
$ cgset -r cpu.cfs_quota_us=20000 g1
#查看是否设置成功
$ cgget -r cpu.cfs_quota_us g1
- #启动进程，通过top可以看到cpu占用100%，同时拿到进程pid：2231
$cat t1.sh
$ /bin/bash
x=0
while [ True ];do
x=$x+1
done;
$ sh /tmp/t1.sh &
- #将此进程加入控制群组g1
$ cgclassify -g cpu:/g1 2231
$ cat /sys/fs/cgroup/cpu/g1/tasks
- 通过top看，cpu消耗变成了20%
- 注意：最好将一个进程写在一个控制组内；将多个进程写在一个控制组会共享cpu限制；
- 如：在一个控制组内写入3个进程，cpu限制使用为20%，每个进程大概会占6%左右；