CPU usage 100 percent fix
When CPU hits 100%, the fastest path is to determine whether one process is pegged, whether the system is IO-bound, or whether scheduling overhead is distorting the picture.
Common symptoms
- System becomes laggy
- Request latency spikes
- Short bursts become sustained saturation
Likely causes
- Infinite loop or tight loop
- Heavy query or compute workload
- Disk or network waits creating backlog
Evidence to look for
One PID remains top CPU for multiple snapshots
Disk utilization and await times climb
Context switches spike abnormally
What it usually means
100% CPU can mean real compute saturation or hidden waiting pressure. The fix depends on which signal chain is present.
What to do next
- 1Inspect the top PID immediately
- 2Profile the process if it stays hot for 30+ seconds
- 3Check disk, swap, and lock contention before scaling blindly
See what's causing your CPU
cpum.ai turns CPU, process, disk, and memory signals into plain-English explanations with evidence.
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