below
A Linux resource monitor that records system, cgroup and process statistics and replays them later.
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About below
below is an interactive terminal tool for viewing and recording historical system data on Linux. Along with live views of hardware resource use, it shows the cgroup hierarchy with cgroup and process information, and it can record this data so you can go back and see what the machine was doing at an earlier time.
It suits administrators investigating a past slowdown or memory problem on a server, particularly on systems that make heavy use of cgroups and containers.
Strengths
- Records data so past events can be replayed
- Shows the cgroup hierarchy alongside process details
- Interactive terminal interface
Limitations
- Linux only
- Aimed at servers rather than casual desktop use
Details
- Pricing
- FreeFree and open source.
- License
- Apache-2.0
- Developer
- Meta
- Platforms
- Linux, Command line
- How it runs
- Downloadable app
- Account
- Not required
- Works offline
- Yes
- Best suited for
- Investigating what happened on a Linux server after the fact
- Categories
- System monitoring, CLI tools
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to below
Compare allSoftware that can replace below for an important use case, and what changes if you switch.
atop
A full-screen Linux performance monitor that reports and logs system and per-process resource usage.
atop also logs system and per-process usage for later review and includes exited processes, but lacks below's cgroup hierarchy view and is not open source.
sysstat
Collection of Linux command-line performance tools including sar, iostat, mpstat and pidstat.
sysstat records history with sar and covers CPU, disk, per-process and network statistics, with text output instead of below's interactive replay interface.
Performance Co-Pilot
A toolkit for collecting, archiving and analysing performance metrics across many systems.
Performance Co-Pilot archives metrics across many hosts and operating systems for live and historical analysis, suiting fleets better but with a steeper learning curve.
nmon
A terminal performance monitor for Linux and AIX showing CPU, memory, disks, network and processes.
nmon records performance to CSV for later analysis and runs on Linux and AIX, but has no cgroup view or built-in replay like below.
htop
Interactive process viewer for the terminal.
htop gives an interactive live process view on Linux and macOS, but records nothing, so it cannot show what happened after the fact.
btop++
A terminal resource monitor that looks good enough to leave open, with processes, CPU, memory, disks, network and GPUs.
btop++ shows live processes, CPU, memory, disks, network and GPUs in one screen, but has no historical logging or replay.
below as an alternative
Listings that name below as an alternative.
dool
A Linux command-line tool that reports CPU, memory, network, disk and load statistics in real time.
below records system, cgroup and process statistics on Linux so past events can be replayed in an interactive terminal interface.
Similar software
Related functionality, not necessarily a direct replacement.
cAdvisor
A daemon that collects and analyzes resource usage and performance data for running containers.
Netdata
Per-second metrics for a machine with no configuration, and charts that appear the moment you install it.
bpftrace
A high-level tracing language and command-line tool for observing the Linux kernel and processes with eBPF.
sysdig
A Linux command-line tool for exploring and troubleshooting systems by capturing system calls, with container support.
iotop-c
A top-like Linux terminal tool that shows disk read and write activity for each process.
