Not being able to parallelize.

[martinmestre]

Hello,
thank you for this great package. I am using the :thread option and running the code as
julia --threads 8. The code keeps working serial.

Here is my code:

`"""Perform optimization for ϵ ∈ [56, 370] sequentially."""

using Pkg
Pkg.activate(".")
using PyCall
using Evolutionary
using DelimitedFiles
using CSV
using DataFrames, DataFramesMeta

pushfirst!(PyVector(pyimport("sys")."path"), "")
importLib = pyimport("importlib")
stream = pyimport("stream")
potentials = pyimport("potential_classes")
u = pyimport("astropy.units")
importLib.reload(stream)
importLib.reload(potentials)

"""Initial orbit conditions and output file."""

const ic_file = "param_fit_orbit_from_IbataPolysGaiaDR2-data_fixedpot.txt"
const ic = readdlm(ic_file)
const r☼ = 8.122

const sol_file = "param_optim_pot.txt"

println("threads=", Threads.nthreads())

"""Loop in ϵ."""

"""χ² wrap."""
function χ²Full(x)
θ = x[1]
ω = x[2]
β = x[3]/10^5
return stream.chi2_full(θ, ω, β, m, ic, r☼)
end

"""Main function."""
function main()
lb = [35, 37, 1.0]
ub = [25, 30, 1.5]
x₀ = [36., 27., 1.25]
res = Evolutionary.optimize(χ²Full, x₀, DE(populationSize=100),
Evolutionary.Options(iterations=100,
abstol=5.e-5,
reltol=5.e-5,
parallelization=:thread))
# open(sol_file,"a") do io
# println(io, "xmin = $(xmin)")
# end
return res
end

"""Running."""
m = 56.0
res = main()
display(res)`

I would really appreciate any help.
Besides I would like to know if it is possible to put some box in parameter space so that the solutions doesn't explore regions outside it.