New disk CPU load test available

[Roderick W. Smith]

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Hi all,

I've just written a new test (disk/disk_cpu_load_{name}; script name
disk_cpu_load). This test measures the CPU load during a read of data
(default: 4 MiB) from a disk device, and fails if that CPU load
exceeds a specified value (default: 30). We're deploying this as a
greylist test for server certification, and of course it's now
available for client use, too. The CPU load threshold, amount of data
read, and disk device are all adjustable via options to the script.

In preliminary testing, Jeff Lane and I have observed CPU loads
ranging from 6% to 27% on most systems -- x86-64 servers, ARM64
servers, and x86-64 and x86 desktop/laptop systems. The only system to
exceed 30% in our initial testing was an ancient x86 Mac Mini (it
produced 52% CPU load). The servers tended to produce lower CPU loads
(most were below 10%). Thus, I expect the 30% threshold should be OK
for client work, too, but you can test that yourselves, and if
necessary create a new job definition to adjust it.

- -- 
Rod Smith
Server and Cloud Certification Engineer
rod.smith at canonical.com
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