How can I prevent the memory distributed in Julia?

[lungben]

@Lyupinpin

ins_force = zeros(N,3,5000);
Force = zeros(N,3,5000,3);
Threads.@threads for i = 1:3
    start = time()
    file = readdlm(string("Force",5000*(i-1),".txt"))
    index = 1;
    idx = 1;
    while idx < size(file,1)
        ins_force[:,:,index] = file[idx+1:idx+N,:];

This code is not thread-safe: ins_force is defnied outside of the multithreaded part, but used inside without accounting for the thread-loop index i.
Note that the Matlab version does not have this issue, there Force_temp is defined inside the parfor loop.
Furthermore, this code should be wrapped in a function to avoid usage of global variables, which are type-unstable.