Process & Resource Monitoring (Top/Htop/Ps/Systemd)

Find out who is actually hogging your IO without waiting for iostat to lie to you

🧩 The Challenge

Dealing with a server that suddenly turns into a brick is the worst, especially when top shows the CPU is mostly idle. I spent three hours last week chasing a ghost load before I realized a rogue logging process was slamming the disks into oblivion.

💡 The Fix

Use iotop in non-interactive mode to grab a quick snapshot of the actual disk offenders. It’s way better than guessing which process has the file descriptors stuck open.

sudo iotop -oPa -n 5

⚙️ Why It Works

Setting the -o flag filters out everything except processes actually doing IO, while the -a flag shows the accumulated total since the command started. You get a clean list of the top culprits instead of a screen full of noise.

🚀 Pro-Tip: Alias this to something like ‘topio’ and stop wasting time staring at standard process monitors.

Linux Tips & Tricks | © ngelinux.com | 11/11/2026