The sar command in Linux is a valuable tool for collecting and analyzing system activity information. It reports various aspects of system performance, such as CPU usage, memory utilization, disk activity, network traffic, and more. When troubleshooting performance issues, sar enables you to review historical data and identify the causes of high load on specific system components.
When the CPU utilization is close to 100 percent, it indicates that the processing workload primarily demands the CPU. This information helps determine if the system is experiencing a CPU-bound situation.
By default, sar saves its log files in the /var/log/sa/sadd directory, where "dd" represents the current day. These log files are valuable for retrospective analysis and tracking system activity over time.