Cgroups

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Pacakges

cgroups functionality that was released in Linux Kernel version 2.6.24

Packages:

• cgroup-lite: cgroups-mount, cgroups-umount
• cgroup-tools: cgcreate, cgexec, lscgroup among others
• cgroupfs-mount

systemd-cgls
systemd-cgls memory
systemd-cgtop

Basic Commands

• Create a group : cgcreate -g memory:myGroup
• cgexec -g memory:myGroup YOUR_PROGRAM_TO_EXEC

• You can use cgget to view the current limits, usage, & high watermarks of the group:

sudo cgget -g memory:/myGroup|grep bytes 
memory.kmem.tcp.usage_in_bytes: 0
memory.soft_limit_in_bytes: 9223372036854771712
memory.kmem.tcp.max_usage_in_bytes: 0
memory.max_usage_in_bytes: 0
memory.limit_in_bytes: 9223372036854771712
memory.kmem.max_usage_in_bytes: 0
memory.usage_in_bytes: 0
memory.kmem.limit_in_bytes: 9223372036854771712
memory.kmem.usage_in_bytes: 0
memory.kmem.tcp.limit_in_bytes: 9223372036854771712

I/O control, more accurate cgroup I/O control with blk-iocost

Related terms

• ulimit

Activities

• Read https://wiki.archlinux.org/index.php/cgroups
• How to limit to CPU and Memory : cgcreate

See also

• systemd-cgtop, docker stats
• netdata cgroups plugin
• cgroups: cgcreate
• Containers, OCI: Docker (dockerd), containerd, runc, Podman, buildah, skopeo, lxd, Container Registry, Service mesh, Windows Server containers, Containerpilot, CoreOS
• iotop, iostat, sar -d, fio, nmon, vmstat -d, dd, nmon, stress
• Linux Kernel: namespaces, Cgroups, OOM, proc, Linux Kernel changelog, sysctl, Grub, ENOSPC, DKMS, syscall, Transparent huge pages, smatch

https://kernelnewbies.org/Linux_5.4#More_accurate_cgroup_I.2FO_control_with_blk-iocost

https://www.freedesktop.org/software/systemd/man/systemd-cgtop.html