System Activity Report, also known as sar, is one of the most important utility for Linux system administrators when it comes to performance monitoring of a Linux system. sar provides an overview of the Linux system with various crucial metrics which include Processor, Memory, I/O Devices and Network related information. With sar, one can gather and store the information whenever there is an issue with the Linux server, and then use this data in order to deal with similar issue in future by comparing these system statistics with the ones at that point of time. In brief, historical analysis can be made a lot easier, when sar is used.
With sar, one can get information regarding following metrics:
- Overall CPU Utilization
- Individual CPU Utilization
- Memory Utilization
- Swap Utilization
- Block Device Statistics
- I/O Related Details
- System Buffer and Context Switch Related Information
- Network Related Statistics
- Memory Allocation
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