Groups   55 of 99+      julia-users › How to import all symbols from a module with  everywhere? 5 posts by 2 authors      Ismael Venegas Castelló    9 26 15   Hello everyone!  I have been trying to do some parallel tests with a simple example using Images and Colors,  you can see here: http:  nbviewer.ipython.org gist Ismael-VC e18bcae78a49f68a0838 ERROR  unhandled task failure : On worker 15: UndefVarError: Gray not defined  The same on every worker.  It seems that the problem is the way I'm importing the modules? I do:  addprocs CPU_CORES    everywhere importall Images, Colors   everywhere function procesar_imagen imagen::AbstractString, σ 2      imagen₁   imread imagen      imagen₂   convert Image Gray , imagen₁      σ₁    σ, σ       un valor de σ por cada dimensión     imagen₃   imfilter_gaussian imagen₂, σ₁      imagen₄   reinterpret Float64, data imagen₃       return var imagen₄  end  y    time  parallel vcat for i   1:100     gc        llamar al recolector de basura     procesar_imagen  imagen.jpg   end  gc    y  Thanks in advance.  Cheers!     Nils Gudat    9 26 15   The way to do this is  addprocs CPU_CORES-1  import Images, Colors  everywhere using Images, Colors  I have to admit that I still don't understand the difference between import and using, but I think import doesn't make the exported functions available in the namespace of each worker, for that you'll need using.     Ismael Venegas Castelló    9 26 15   Thank you very much Nils, that solved my issue!     Ismael Venegas Castelló    9 26 15   This is the result:   http:  nbviewer.ipython.org gist Ismael-VC 3fa7fb19fff61b0c6eeb  530.838512 seconds  18.68 k allocations: 2.102 MB   What's the advantage of  addprocs CPU_CORES - 1  ?    This message has been deleted.