Add some additional information to LinearAlgebra.versioninfo()

[DilumAluthge]

Example output:

julia> LinearAlgebra.versioninfo()
BLAS: libblastrampoline (f2c_capable)
  --> /Users/dilum/.asdf/installs/julia/1.7.2/lib/julia/libopenblas64_.0.3.13.dylib (ILP64)
Threading:
  Threads.nthreads() = 1
  BLAS.get_num_threads() = 1
Relevant environment variables:
  JULIA_NUM_THREADS = 1
  MKL_NUM_THREADS = 1
  OPENBLAS_NUM_THREADS = 1

[DilumAluthge]

cc: @carstenbauer

[carstenbauer]

A first comment: I would probably strip the path and only show --> libopenblas64_.0.3.13.dylib (ILP64). Actually, why not align it with the BLAS.get_config() output and do something like this:

julia> LinearAlgebra.versioninfo()
BLAS Libraries (libblastrampoline):
 └ [ILP64] libopenblas64_.0.3.13.dylib
Threading:
 ├ Threads.nthreads() = 1
 └ BLAS.get_num_threads() = 1
Relevant environment variables:
 ├ JULIA_NUM_THREADS = 1
 ├ MKL_NUM_THREADS = 1
 └ OPENBLAS_NUM_THREADS = 1

(or without the lines)

julia> LinearAlgebra.versioninfo()
BLAS Libraries (libblastrampoline):
  [ILP64] libopenblas64_.0.3.13.dylib
Threading:
  Threads.nthreads() = 1
  BLAS.get_num_threads() = 1
Relevant environment variables:
  JULIA_NUM_THREADS = 1
  MKL_NUM_THREADS = 1
  OPENBLAS_NUM_THREADS = 1

[ViralBShah]

Perhaps good to show the full path, since it helps debug if someone has a weird setup and the wrong library is being picked up.

[DilumAluthge]

Yeah, currently LinearAlgebra.versioninfo() prints the full path, and I think we should keep that behavior.

[carstenbauer]

Alright then let's keep the path. But, in any case, multiple libraries can be loaded and the current output doesn't reflect this.

[DilumAluthge]

Doesn't this cover the case of multiple libraries?

julia/stdlib/LinearAlgebra/src/LinearAlgebra.jl

Lines 538 to 541 in 6e41879

	for lib in config.loaded_libs
	interface = uppercase(string(lib.interface))
	println(io, indent, "--> ", lib.libname, " (", interface, ")")
	end

[carstenbauer]

Oh, it does, my bad. Sorry for the noise.

[ViralBShah]

Would be nice to see if @staticfloat has any thoughts here. It's more verbose than this, but essentially along the same lines.

julia> BLAS.get_config()
LinearAlgebra.BLAS.LBTConfig
Libraries: 
└ [ILP64] libopenblas64_.0.3.17.dylib

Although, I did not know that LinearAlgebra.versioninfo() already existed.

[staticfloat]

Can't we just re-use the BLAS.get_config() output here?

[DilumAluthge]

BLAS.get_config() does not print the full path to the libraries.

[ViralBShah]

I still feel that this is a bit redundant. We should try to have one function to query all the relevant information for LinearAlgebra stuff in Julia.

For now this is fine, but would be nice to refactor and clean it all up into one reporting function.

[DilumAluthge]

We've talked (see e.g. #43834 (comment)) about having $(stdlib_name).__diagnostics__() functions that would return data in a structured form. And then InteractiveUtils.diagnostics() would pretty-print the data from all stdlibs.