How do you gather information about high CPU load issues in Linux?

To gather information about high CPU load issues in Linux, you can use the following tools and commands:

• top or htop — for monitoring processes with the highest CPU usage in real-time.
• pidstat -u — for detailed analysis of CPU usage per process.
• ps -eo pid,ppid,cmd,%cpu --sort=-%cpu | head — displays the top processes by CPU load.
• perf — for profiling and analyzing hot spots in the code.
• strace -p <pid> — for tracing system calls of a process.
• mpstat — for monitoring CPU load per core.

Example sequence of actions:

# View processes with the highest load
top -b -n1 | head -20

# Analyze a specific process
pidstat -p <pid> 1 5

# Profile the process
perf top -p <pid>

It is also useful to check application logs and system logs (/var/log/syslog or journalctl) for errors that may cause increased load.