Use Multicore JIT for faster Bicep startup times

[stan-sz]

Is your feature request related to a problem? Please describe.
Bicep no longer accepts multiple files in a single command and requires to re-invoke the app in the shell multiple times (related to #1285).

Describe the solution you'd like
Bicep's startup times can potentially be improved by using https://docs.microsoft.com/en-us/dotnet/api/system.runtime.profileoptimization?view=net-5.0 (e.g. roslyn). This might also help the Bicep Lang server for VS code extension.

[anthony-c-martin]

Interesting, thanks for the info!

[majastrz]

Indeed. We should benchmark and see how much it helps.

[stan-sz]

Building the examples in the repo using this command and a locally-built Bicep in Release:

github\bicep\docs\examples [main ≡]> measure-command { gci -Recurse *.bicep | %{ ..\..\src\Bicep.Cli\bin\Release\net5.0\bicep.exe build $_  } }

I got these numbers for three consecutive runs:

With multicore JIT:

TotalSeconds : 97.9127821
TotalSeconds : 101.3656751
TotalSeconds : 97.3832298

Current main branch version:

TotalSeconds : 151.3699426
TotalSeconds : 154.0155866
TotalSeconds : 152.55113

[majastrz]

That's a nice improvement!