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Open-source network & system diagnostics

Performance engineering from the terminal.

Find network, CPU, disk and kernel bottlenecks with four open-source terminal tools. Start with netwatch to see what’s using your network.

$ brew install netwatch explore projects →

downloads across the tools120k+netwatch is packaged inHomebrew core, conda-forge, Scoop, nixpkgs, AUR Terminal TroveTool of the Week

Projects

The tools

netwatch is stable. The other three are previews. Versions are live from GitHub.

netwatchstable · v0.40.0

Real-time network diagnostics.

use when the network is slow or dropping

Investigate slow connections, packet loss and DNS delays. Basic visibility works unprivileged; packet capture needs capture permissions.

TUImacOSLinuxWindows

install ↓$ man netwatch — how to use →

Follow each connection. See processes, remote hosts and their network connections.

syswatchpreview · v0.14.5

CPU, memory and process diagnostics.

use when a machine feels slow

Find CPU, memory and process bottlenecks, then use the timeline to see what changed.

Spot CPU pressure. Compare individual cores and the processes using CPU.

TUImacOSLinux

$brew install syswatch

$ man syswatch — how to use →

diskwatchpreview · v0.7.1

Disk capacity, device health and slow I/O.

use when a disk is full or I/O is slow

Investigate full disks and slow I/O with capacity trends, device health and the files being written right now.

See disk activity. Follow read and write throughput over time.

TUImacOSLinuxWindows

$brew install diskwatch

$ man diskwatch — how to use →

kernwatchpreview · v0.5.1

Linux kernel observability.

use when the cause is in the Linux kernel

Trace scheduling delays, memory pressure and slow I/O on Linux. Optional eBPF probes add detail; recorded sessions replay offline.

Find tasks that need attention. See which tasks are blocked, waiting or starved of CPU.

TUILinuxeBPF

$cargo install kernwatch --locked

$ man kernwatch — how to use →

all repositories on github →

Install

Install netwatch

Install it, run it, and you’re looking at your machine’s network in real time. Packet capture needs extra permissions.

read-only: They inspect your machine without changing its configuration. Anything that changes the system needs an explicit action.
local: No account, no cloud service and no background daemon.
MIT, no telemetry: Read the source and use it in your own projects. The tools send no usage data.

~ zsh

$brew install netwatch

# Homebrew, Apple Silicon and Intel

# no tap required

$netwatch

Homebrew · other methods →