bug#63986: Julia is very slow

[Cayetano Santos via Bug reports for GNU Guix]

Hi guix,

  I just noticed that the following line

    julia -e 'using Pkg; Pkg.add("BenchmarkTools"); using BenchmarkTools; N = 
1000; A = rand(N, N); B = rand(N, N); @btime $A*$B'

  gives around 530 ms in my laptop when using guix provided julia. Same
  behavior when running within a guix container.

  This very same code, using the binary one may download from the julia
  site gives 15 ms.

  I’m using here an up to date guix. As a reference, julia binary
  provided by archlinux takes also 15 ms.

Thanks,

Cayetano Santos