Optim.jl timing, memory allocation issue https://github.com/JuliaOpt/Optim.jl/issues/292

optim_time_memalloc_issue.jl

using Optim
## try commenting out the log in this line, Optim src/problems/univariate.jl:
## p18(x) = x <= 3.0 ? (x-2.0)^2 : 2.0###*log(x-2.0)+1.0

function frunmap(nmap::Int64, nmat::Int64)
    M = randn(nmat, nmat)
    
    # closure to parallel-apply
    function fmaploc(vi)
        # not doing anything here
        return 1.0
    end
    
    return pmap(fmaploc, collect(1:nmap))
end

Ntimes = 10
Nmatsize = 1_000

@time println(frunmap(Ntimes, Nmatsize))
@time frunmap(Ntimes, Nmatsize)

# repeat more times than CPU cores
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)
@time frunmap(Ntimes, Nmatsize)