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How to Troubleshoot High CPU Usage in Linux

  • Xernode
  • 1 min de lectura
  • 3 de abril de 2026
Monitoring monitoring linux troubleshooting cpu performance

Introduction

High CPU usage can slow down your server and affect website performance. This guide shows you how to identify and fix the most common causes of high CPU usage in Linux.

Step-by-step Guide

  1. Check current CPU usage
    • topn
      • o usa:
    • htop
    • (If not installed: sudo apt install htop)
  2. Identify the process consuming the most CPU
    • In top or htop, look at the “%CPU” column.
    • ote the PID (Process ID) of the top-consuming process.
  3. Get more info about the process
    • ps -p PID -o %cpu,%mem,cmdn
      • (Replace PID with the actual process ID)
  4. Kill or restart a problematic process (if needed)
    • sudo kill -9 PIDn
      • (Use with caution!)
  5. Check for cron jobs or scripts running in the background
    • crontab -l
  6. Check system logs for errors
    • sudo tail -n 100 /var/log/syslogn
      • o para CentOS/RHEL:
    • sudo tail -n 100 /var/log/messages
  7. Monitor CPU usage over time
    • sar -u 1 10n
      • (If not installed: sudo apt install sysstat)

Recommendations

  • Regularly monitor your server with htop or top.
  • Investigate any unknown or suspicious processes.
  • Optimize or update applications that use excessive CPU.
  • Consider upgrading your VPS if you consistently hit CPU limits.

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