This results
in having more "manoeuvre room" in case of temporary peak loads. However,
adding more safety margin increases costs. Although this is intuitive, the cost
increase is linear, whereas the QoS improvement is exponential. In our experiments,
we showed that increasing costs around 23% makes the system reduce
QoS violations by over 10 times. Multiple tests with dierent cost parameters
yield to similar results, leading to conclude the incremental more costs versus
exponential better quality" trend.
Therefore, the allocation method that explores domain specic information
for better resource consumption predictions yields signicantly better quality
without compromising the cost-eectiveness of the solution. We nd this result
relevant and it serves as an incentive for educational institutions and Cloud
providers to collaborate and understand better the schools demand in order to
optimise the resource allocation strategies.