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Introduction:
High CPU usage on a Linux server can degrade performance and slow down applications. This article covers advanced troubleshooting techniques to diagnose and resolve the issue.
Steps to Troubleshoot:
-
Use Top Command: Run the
topcommand to see which processes are consuming the most CPU. Look for any runaway processes or high resource consumers. -
Analyze Logs: Check
/var/log/syslogand other relevant logs for any unusual activity. Certain errors or repeated tasks could be contributing to high CPU usage. -
Optimize Processes: If a specific process is consuming too much CPU, determine if it can be optimized. For example, reduce the number of threads or prioritize other processes using
niceorrenicecommands. -
Check for Kernel Issues: High CPU usage can also be caused by kernel-level problems. Run
dmesgto check for kernel errors or resource conflicts. -
Check for Zombie Processes: Use
ps aux | grep 'Z'to find zombie processes (defunct processes) and kill them usingkill -9. -
Monitor Load with SAR: Use the
sarcommand to monitor system performance over time and spot CPU spikes. This can help identify patterns or peak usage times that need optimization.
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