Linux is typically packaged as a Linux distribution. This script has been tested on the following Linux and Unix platforms: RHEL 4, RHEL 5, RHEL 6, CentOS 4. Check CPU utilization using mpstat The mpstat tool is a part of the sysstat package. We can't use a timed cronjob to run periodically because cron only has minute precision, which isn't helpful since you could launch top/htop yourself within a minute. Nagios plugin to check CPU performance statistics. To check the CPU and memory utilization in Linux, you can use the ‘top’ command. In an idle router, you can see that only one CPU is. While top is running, press '1' on your keyboard, it will then show CPU usage per core. The general rule is that 70 utilization is healthy anything higher should prompt software developers to plan for future growth or optimization. If a system has four processors and all cores are running at full capacity, for example, a total utilization rate of 4.0 would be seen. The script would look something like this: watch -n 1 bash -c $'top -n 1 | head -n 3 | tail -n 1 | awk \'\' > ~/cpu-usage.csv' If you press the 1 key while watching top it toggles the top display to show both CPUs on the output. A Linux system’s CPU usage is determined by its number of CPUs. Might not be the optimal solution, but you could try doing a cronjob on reboot to log the CPU usage to a file every second?
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