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

Stop ignoring the process I/O wait state

🧩 The Challenge

You look at top and the CPU usage is low, yet the system feels like it is stuck in molasses and everything is hanging. I have spent way too long staring at load averages only to realize some runaway process was thrashing the disk.

💡 The Fix

Start checking the process wait status to see exactly which PID is stuck waiting for I/O operations to complete. It saves you from guessing which application is choking your storage backend.

ps -eo pid,user,state,wait,cmd --sort=-wait | head -n 10

⚙️ Why It Works

Adding the wait column exposes the kernel wait channel for each process, showing you the exact kernel function where a thread is parked. It beats guessing whether a process is deadlocked or just waiting on a slow network share.

🚀 Pro-Tip: Alias this as psio so you don’t have to remember the column flags when the server is actually burning down.

Linux Tips & Tricks | © ngelinux.com | 10/2/2026