Liangxu Linux

Apr 22, 2025 · Operations

How to Quickly Check Linux Memory Usage with Free, /proc/meminfo, vmstat, top, htop and More

This guide explains how to monitor memory usage on a Linux 7.9 system using a variety of commands and tools—including free, /proc/meminfo, vmstat, top, htop, sar, smem, glances and ps_mem—showing key metrics, options, example outputs and interpretation tips for both servers and desktops.