zoio Marcelo Duarte Trevisani

Use this command to install zoio:

winget install --id=marcelotrevisani.zoio -e

zoio lets you pick running processes via a checkbox list or match them with regex patterns, then watches their CPU, memory, disk I/O, and network I/O in real time. All matched subprocesses are followed automatically. Metrics are drawn as four live plots (one per resource) that can be viewed per-process, combined, or grouped. When you stop the session, the full capture is exported to CSV.

zoio

Cross-platform (macOS / Linux / Windows) process resource monitor written in Rust.

zoio lets you pick running processes via a checkbox list or match them with regex patterns, then watches their CPU, memory, disk I/O, and network I/O in real time. All matched subprocesses are followed automatically. Metrics are drawn as four live plots (one per resource) that can be viewed per-process, combined, or grouped. When you stop the session, the full capture is exported to CSV.

Features

Process discovery — live checkbox list of every running process (searchable by name or pid).
Regex filters — add one or more patterns; any matching process (and optionally its child tree) is tracked.
Per-process metrics — CPU %, resident memory, disk I/O rate, network I/O rate, sampled independently.
Real-time plots — four separate plots (CPU / Memory / Disk / Network) rendered with egui_plot.
View modes — Individual (one line per process), Combined (aggregate of all), Grouped (aggregate per user group).
Groups — bundle the currently-selected PIDs into a named group and plot it as one aggregated series.
Start / Stop — explicit session control; stopping preserves the captured data for inspection and export.
CSV export — flat table with timestamp_ms, elapsed_secs, pid, name, parent_pid, cpu_percent, memory_bytes, disk_bytes_per_sec, net_bytes_per_sec.

Build & run

cargo run --release

Tests

# unit tests + integration tests + property tests
cargo test

# unit tests only (no child process spawning)
cargo test --lib

The integration suite under tests/ spawns real child processes (sleep on unix, cmd on Windows) and verifies that zoio can discover them, sample their metrics, and round-trip them through CSV.

Architecture

src/
├── lib.rs              # public API re-exports
├── main.rs             # eframe window bootstrap
├── app.rs              # AppState + ZoioApp (egui rendering)
├── process_monitor.rs  # sysinfo-backed discovery + sampling
├── process_filter.rs   # regex FilterSet
├── metrics.rs          # MetricKind, MetricSample, ProcessHistory
└── csv_export.rs       # CSV writer
tests/
├── monitor_flow.rs     # end-to-end: spawn → monitor → CSV
└── csv_properties.rs   # property-based CSV invariants

The core pipeline (AppState) has no egui dependency and is fully headlessly testable. The ZoioApp type wraps it with the eframe rendering layer.

Platform notes

Per-process network counters are not uniformly exposed by sysinfo across platforms. On platforms where they are unavailable, the network series reports 0.0. Disk, CPU, and memory work everywhere sysinfo does.
On Windows, accurate CPU sampling requires at least two refreshes; the first reported value is 0.0.