Document performance testing of cloud site

[gwarf]

We should provide guidance/example on how to assess the performance of a cloud site, it would be useful to understand what can be expected from a site and also to help diagnose/troubleshoot deployment problems.

Some pointers:

• https://github.com/GoogleCloudPlatform/PerfKitBenchmarker
• https://cloud.google.com/compute/docs/benchmarks-linux
• https://phoronix-test-suite.com/

Example:

# Using sysbench
sudo apt-get install sysbench
sysbench --test=cpu --cpu-max-prime=20000 run
# Using phoronix test suite
sudo apt-get install phoronix-test-suite
phoronix-test-suite list-available-suites
# Chose one, and run it.
phoronix-test-suite run pts/cpu 

[enolfc]

👍

But I think we should go beyond and aim to do regular benchmarking of the sites. We could start a VM periodically to execute the benchmark and get metrics that help us to understand the site performance