Dev Tools · 1h ago
Building ratatop: Why `free -h` Lies About Memory Usage
A developer building a Rust system monitor discovers that Linux's `MemFree` value is misleading, as unused RAM is intentionally filled with cache. The true metric is `MemAvailable`, which estimates reclaimable memory. The project, ratatop, uses ratatui to display accurate memory stats, avoiding common pitfalls in `/proc/meminfo` parsing.
Meridian48 take
This deep dive into Linux memory accounting is a useful reminder that even seasoned developers can misinterpret system metrics, but the story is niche and unlikely to resonate beyond a small audience of Rust and Linux enthusiasts.
linux-memoryrust-monitoring