System Monitor

A Silo extension that keeps CPU, memory, and per-terminal process activity visible at a glance — without leaving your editor. Works on macOS, Linux, and Windows.

What you get

• Side panel — a dedicated SYSTEM tab with a memory donut chart, a scrolling CPU history graph (User vs System split), and a live Processes list for the current workspace
• Status bar readouts — compact live counters at the bottom of the window that stay visible even when the panel is closed
• Configurable — choose which metrics appear, on which surfaces, and in what order via Settings or the in-panel gear icon
• Persistent settings — your choices are saved across restarts and apply to all workspaces automatically

Processes

The Processes section shows one row per terminal in the active workspace — its foreground program, live CPU/memory (rolled up across its child processes, so a busy build running under a shell doesn't read as idle), and idle/busy state. Expand a row to see the full process tree; click a title to jump to that terminal; hover a row for a one-click kill (with a confirmation) that terminates the process group but leaves the shell itself running.

CPU/memory stats are opt-in and only sampled while the panel is visible and the section is enabled — closing the panel or disabling it in Settings stops the extra polling. Process trees (the expand/kill affordances) require ps and aren't available on Windows; the panel still shows each terminal's foreground program there.

Cross-platform

The extension is a reference implementation for writing platform-aware Silo extensions. It asks the host which OS it's running on via ctx.system.getInfo() and selects a matching collector (src/collectors/) — each one a small, unit-tested module with a pure parser:

The CPU User/System split is preserved on all three platforms. Memory categories differ per OS, so the donut renders whatever segments the active collector reports rather than a fixed list. Adding a platform means adding one collector and a case in selectCollector — the union type from the SDK makes a missing case a compile error.

Permissions

Declared in package.json under silo.permissions:

• process — run iostat / vm_stat / PowerShell on macOS and Windows.
• fs:read — read /proc/stat and /proc/meminfo on Linux (these live outside the workspace). Reading /proc rather than shelling out also avoids subprocess-spawn restrictions under sandboxed Linux packaging.

Installing

From a GitHub Release

1. Go to Releases.
2. Right-click the .tgz asset → Copy link address.
3. In Silo: Settings → Extensions, paste the URL and click Install.

From source

git clone https://github.com/silo-code/silo-extensions
cd silo-extensions/system-monitor
npm install
npm run build

Then in Silo: Settings → Extensions → Install from folder, point at this directory.

Building

npm install
npm run build        # one-shot
npm run build:watch  # watch mode
npm test             # unit tests