In BSD, sa(8) provides functionality similar to the Linux sar(1) command, which is part of the ssystat suite. sa(8) can provide detailed statistics such as
• The average number of I/O operations per execution
• Per command statistics including number of calls, elapsed time, total CPU, and average number of I/O operations
• Per user statistics including number of commands invoked, total CPU time, and total number of I/O operations
These statistics can be used to determine a system's baseline and to watch for anomalies in behavior.
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