Monitor CPU and disk usage with iostat
Would you like to know how your hard disks behave? Or how well does your CPU churn? iostat is a utility that reports statistics for CPU and I/O devices on your system. It can help you identify bottlenecks and mis-tuned kernel parameters, allowing you to boost the performance of your machine.
On some systems, the utility will be installed by default. Ubuntu 9.04, for example, requires that you install sysstatpackage, which, by the way, contains several more goodies that we will soon review:
Then, we can start monitoring the performance. I will not go into details what each little bit of displayed information means, but I will focus on one item: the first output reported by the utility is the average statistics since the last reboot.
Here’s a sample run of iostat:
iostat -x 10 10
The utility runs 10 times, every 10 seconds, reporting extended (-x) statistics. Here’s what the sample output to terminal looks like:
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