I couldn't find this info despite having looked at flight recorder documentation? I was basically looking to record all of the execution of my program and not even lose a single small function because of sampling.
Is flight recorder a sampling based or an instrumentation based profiler?
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From the docs:
(Emphasis added.)
Generally speaking, instrumentation is somewhat expensive, so if you see a tool that promises very low/no overhead, you can be pretty sure it's sampling.