Troubleshooting of linux system performance problems

For troubleshooting of linux system performance problems, sar, top, and free are required. Check that sar-h is not installed. It is not troublesome to directly install sar in linux. top followed by load, % wa, % idle, etc. check cpu usage sar-u-o 20130724 cputest 60 5
As a result, the sar cpu usage parameter is recorded five times, and the interval is 60 seconds. The file name is 20130724cputest. Do not place the binary file under/home and put it in the tmp folder. when avgrp-sz is low, the system usage is low. When the value of % util is close to 1%, the bandwidth of the device is full. if you determine a CPU bottleneck, you can use sar-u to view memory bottlenecks, and use sar-B, sar-r, and sar-W to view I/O bottlenecks, can be viewed by sar-B and sar-d.