In virtualized environments, it is possible that CPU instruction set limit. In my opinion, the performance may have problems.
Which CPU instruction should necessarily be available to ensure a high-performance operation?
Is there any experience? What Instruction are activated at Atlassian Cloud? Or maybe even disabled?
I know that sometimes scale environments are complicated. However, bear in mind that it isn't only CPU you should concern about when thinking about performance. It will depend on many different factors, for example:
# The number of concurrent users that you will have;
# If your application will have a huge coefficient of Read/Write;
# If you will run it over SSL or not;
# How many other virtual machines will be running over its hypervisor (it could affect some I/O), etc...
To sum up, unfortunately, Atlassian doesn't have a complete documentation about the virtualized environments yet, because as I said, it depends on many different factors.
Also, if you need some especial assistance to set your environment up, you might want to contact an Atlassian Expert.
Do some load tests using JMETER.
Hope it helps.
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