These should be present in all Linux kernels. | 10 | quest_nice | Time spent running niced guest |įirst we will be interpreting only fields 1, 2, 3, and 4. | 9 | quest | Time spent running a virtual CPU for guest OS | | 8 | steal | Time spent in other OSes when in virtualized env | | 7 | softirq | Time servicing softirqs | | 5 | iowait | Time waiting for I/O to complete | | 3 | system | Time spent in system mode | | 2 | nice | Time spent in user mode with low priority | The kernel I am running has 10 fields which have the following interpretations. They have specific interpretations as described in the manual. If you open the file you will see that some integers follows the cpu field. We are interested in the file /proc/stat and within it we are interested in the field cpu. For details about the /proc file system check man 5 proc. What fields the file will contain varies with the architecture and the kernel version. This file contains some stats about the kernel, like the number of processes created since boot, number or processes in runnable/blocked states, number of context switches in the system till now, number of swaps or page in page outs, and information about usage of CPU cycles. The file which is required to get the CPU usage is /proc/stat. Instead of going into procfs I will redirect you to wikipedia. There is no disk inodes and thus storage related to the files. No files in procfs exists actually in the disk. The proc filesystem or the Procfs is a special filesystem which gives you a view into the kernel data. As you might have expected this will simply access the CPU time information from /proc pseudo-filesystem and report the results. Today I will post about how to monitor CPU usage by processor in Linux.
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