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Whenever the sar command uses the -f option to specify a file, that file is generated using the sadc 1 1 command. The sadc command polls the system counters at a one-second interval, and writes the information that it receives to a file. The sar command, then reads this file.
CPU
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| Metric | Explanation |
| % Usr | The amount of time that the CPU spends in user mode. |
| % Sys | The amount of time that the kernel spends processing system calls. |
| % WIO | The amount of waiting time that a runnable process for a device takes to perform an I/O operation. |
| Multi CPU Usage | Whether or not a system wity with multiple CPUs is effectively balancing tasks between CPUs, or if processes are being forced off CPUs in certain circumstances. |
| Run Queue Length | The percentage of time that one or more services or processes are waiting to be served by the CPU. |
| Run Queue Occupancy | The percentage of time that one or more services or processes are waiting to be served by the CPU. |
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df -kto gather file system capacity statistics, for the file system.sar -d -fto output disk statistics (e.g. %busy, Read/Write/s) per disk, and compare those statisitics statistics between polling intervals.
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The up.time agent uses the ps -eo command to collect, process metrics from an AIX system. By default, the agent only gathers the top 20 processes and sorts them by the highest CPU usage.
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Workload statistics are sorted within up.time's core. However, the core uses the same 20 processes that were gathered from the Process method. The following data are also gathered with the processes: the names of users, groups and processes along with their invividual individual statistics (e.g. memory and CPU usage). up.time's core will then sort the statistics based on the graph you want to generate (e.g. user, group or process name).
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