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

Stop guessing what that mystery process is doing with your disk I/O

🧩 The Challenge

You know that feeling when the load average is through the roof but your CPU usage looks perfectly fine? I spent three hours last week chasing a ghost process that was slamming the disk and making the entire app stack crawl while the logs stayed silent.

💡 The Fix

Use iotop to pinpoint the exact process eating your drive throughput so you can actually kill the right thing instead of just rebooting and praying. It shows you the real-time read and write speeds for every running process, which is way more useful than just watching top.

sudo iotop -o -P

⚙️ Why It Works

By adding those flags, you filter the output to show only processes actually doing I/O and aggregate the stats by the parent process, so you stop getting distracted by every individual thread that’s just idling. It effectively cuts through the noise and puts the culprit front and center.

🚀 Pro-Tip: Pipe it into grep if you know which user owns the runaway script.

Linux Tips & Tricks | © ngelinux.com | 8/24/2026