Compiler flags when profiling a build

[Per Nordlöw]

On Sunday, 25 October 2020 at 14:34:54 UTC, Guillaume Piolat 
wrote:
> dub -b release-debug   # optimizations AND debug information

Why not use dmd's own `-profile` flag? Is too intrusive on 
performance? I've noticed a massive slow-down with about a 
magnitude.

> The AMD profiler is a very nice alternative to Intel Amplifier.

I'm sitting on Linux. What is the preferred open alternative 
there? What are the pros and cons of the choices oprofile, gprof, 
sysprof, ...? Does anybody have a good comparison chart?

I want to profile an application that parser files into ASTs and 
generates text from those AST. Current bottleneck is currently 
AST-node allocations.