Learn the theory behind Linux CPU usage metrics, how the kernel’s jiffies and /proc/stat values are interpreted, the formula for calculating utilization over intervals, and practical commands like top, ps, and pidstat to observe real‑time CPU performance on servers and desktops.
This article explains the Linux /proc virtual file system and its /proc/self shortcut, detailing how to read process information such as command line, working directory, executable path, environment variables, memory maps, and memory image using simple shell commands.
This guide explains the Linux /proc virtual file system, details the special role of /proc/self for accessing the current process's data, and provides command examples for retrieving cmdline, cwd, exe, environ, maps, and mem information.
This article explains the Linux /proc virtual filesystem, detailing its role as an in‑memory pseudo‑filesystem that provides comprehensive system and process information such as CPU, memory, uptime, process details, hardware, and filesystem data.
This guide explains how a file deleted on a Linux system can still be recovered when a running process holds an open file descriptor, detailing the use of tail, lsof, the /proc filesystem, and simple copy commands to restore the data.
This article presents a comprehensive list of twelve Linux commands and graphical tools—including /proc/meminfo, atop, free, GNOME System Monitor, htop, KDE System Monitor, memstat, nmon, ps, smem, top, and vmstat—that allow you to view and analyze memory consumption in real time, with usage examples and screenshots.
This article examines three Linux user‑kernel communication methods—ioctl, proc, and Netlink—by describing their principles, presenting experimental setups and code, measuring nanosecond‑level call latency, and offering guidance on selecting the most suitable mechanism for a project.
This article explains the difference between CPU load and CPU usage, then shows step‑by‑step how to calculate CPU utilization on Linux using vmstat, parsing /proc/stat, and extracting idle percentages from top, with ready‑to‑run command examples for both single‑core and multi‑core systems.
This guide walks Linux administrators through six practical commands—free, vmstat, /proc/meminfo, top, htop, and per‑process memory checks—detailing their syntax, useful options, example outputs, and how to interpret key metrics for effective memory troubleshooting and performance tuning.
This guide walks you through Linux process fundamentals and equips you with practical commands—ps, strace, pstack, pstree, gdb, and /proc file inspection—to diagnose, trace, and debug running programs step by step.
