btop vs runit

btop is a free resource monitor for Linux and macOS that displays processor, memory, disk, network, and process activity. Its game-inspired menus, mouse support, and responsive interface provide ways to navigate system views and process controls. Users can inspect process details, filter or sort the list, view it as a tree, send signals, or pause the process list. Network graphs scale automatically; other displays cover disk activity and speeds, plus a battery meter. Users can choose graph symbols, create presets, and use theme files shared with bpytop and bashtop or a custom themes directory. GPU monitoring is supported on Linux and on macOS with Apple Silicon GPUs when built with GPU support. NVIDIA monitoring needs the nvidia-ml library, AMD needs rocm_smi_lib, and Intel needs SYSFS read permission. The project documents Linux and macOS installation, package installation for FreeBSD and NetBSD, and Homebrew for macOS and Linux. It recommends a terminal with 24-bit truecolor and wide-character support, a UTF8 locale, and a font covering specified Unicode blocks. The repository lists the Apache-2.0 license.

runit is a free Unix init scheme that supervises services and can replace sysvinit or other init schemes. It runs on GNU/Linux, BSD systems, MacOSX and Solaris, and can be adapted to other Unix operating systems. As process 1, it manages boot, normal operation and shutdown in three stages. The runsv component launches a service's run program and restarts it if it exits; an optional finish program and log service can also be used. The sv utility reports status and provides controls to start, stop, restart, pause or signal supervised services. For logs, svlogd can filter messages and write automatically rotated logs. The chpst utility changes process state and sets limits for resources such as memory, open files, process count, output size, core size and CPU time. runsvdir can start and monitor runsv processes for up to 1,000 service subdirectories. runit can supervise services alongside an existing init scheme without replacing it. The maker provides source and installation instructions, including manual installation without root access. Its documentation warns that UDP logging is unreliable and should be confined to private networks.