Interesting series Part 2: Understanding Linux Load Average
Originally posted on The Dutch Prutser's Blog:
In part 1 we performed a series of experiments to explore the relation between CPU utilization and Linux load average. We came to the conclusion that CPU utilization clearly influences the load average. In part 2 we will continue our experiments and take a look if disk I/O also influences the Linux load average.
Disk I/O and load average
The first experiment is starting 2 processes performing disk I/O on an otherwise idle system to measure the amount I/O issued, the load average and CPU utilization using the
sar command. BTW: My
load-gen script uses the
dd command to generate disk I/O.