![]() On multiprocessor systems, CPU statistics are calculated system-wide as averages among all processors. The report consists of a CPU header row followed by a row of CPU statistics. All statistics are reported each time the iostat command is run. ![]() Each subsequent report covers the time since the previous report. The first report generated by the iostat command provides statistics concerning the time since the system was booted. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks. The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command reports Central Processing Unit (CPU) statistics and input/output statistics for devices, partitions and network filesystems (NFS). Alternatively, you could simply use the traditional interrupt key (‘^C’) when you’re done. When operating top, the two most important keys are the help (‘h’ or ‘?’) key and quit (‘q’) key. It can sort the tasks by CPU usage, memory usage and runtime. ![]() It can display system summary information as well as a list of processes or threads currently being managed by the Linux Kernel. ![]() It displays a listing of the most CPU-intensive tasks on the system, and can provide an interactive interface for manipulating processes. top provides an ongoing look at processor activity in real time. Top commands displays Linux processes in real-time.
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