Would somebody suggest what is the right to work in a parallel loop and write data to the same Dataframe?

[tkf]

You can use Transducers.jl for this (disclaimer: I’m the author):

@tkf

Transducers.jl now can be used to create various table types from DataFrames.jl, TypedTables.jl, StructArrays.jl, etc. See copy and its parallel versions tcopy and dcopy .