cgexec

run a command in a control group

TLDR

Run a command in a cpu cgroup

$ cgexec -g cpu:mygroup [command]

Run with multiple controllers in a single cgroup

$ cgexec -g cpu,memory:mygroup [command]

Run with separate cgroups for different controllers

$ cgexec -g cpu:mygroup -g memory:memgroup [command]

Run with sticky flag to prevent reclassification by cgred

$ cgexec --sticky -g cpu:mygroup [command]

SYNOPSIS

cgexec [OPTIONS] -g controller:cgroup command [args]

cgexec executes a process within a specified control group (cgroup). Unlike cgclassify, which moves already-running processes, cgexec starts a new process directly inside the target cgroup from the beginning.Cgroups allow limiting, measuring, and controlling resource usage by processes for CPU, memory, I/O, and other resources. By launching a process with cgexec, all resource constraints defined for that cgroup apply immediately from process startup, including any child processes it spawns.cgexec is part of the libcgroup-tools package and works with cgroups v1. For cgroups v2 systems, systemd-run provides similar functionality.

PARAMETERS

-g controllers:path

Specify the controller(s) and cgroup path. Multiple controllers can be comma-separated. Can be used multiple times.

--sticky

Prevent cgrulesengd (cgred) from reclassifying the process or its children.

-b

Ignore the default systemd delegated hierarchy path and construct the cgroup path relative to the root hierarchy.

-h

Display help information.

Controllers include:

cpu - CPU time allocation

memory - Memory usage limits

blkio - Block I/O limits

cpuset - CPU and memory node assignment

devices - Device access control

CAVEATS

The cgroup must exist before using cgexec (create with cgcreate). Multiple controllers can be comma-separated in a single -g option or specified with multiple -g options. Requires appropriate permissions or root access. If -g is not specified, cgexec assigns the task based on /etc/cgrules.conf.

HISTORY

cgexec is part of libcgroup, providing cgroup management utilities for resource control on Linux.