[julia-users] Result changes if I change the number of workers

[Eduardo Lenz]

Hi.

I came across a very weird behaviour when using a very simple @parallel 
loop. The block is quite large and complex, but the idea is the following:


A = zeros(some_dimension)
A = convert(SharedArray,A)
@sync @parallel for i=1:some_dimension
   
    Lots of code, but with no function calls
       
    A[i]  += block_result

end

some computation with sdata(A).

If I use 4 processes, I get one result. With 8 processes, a diferent 
result. Without parallel processing, another one.

I am probably losing something, but I think this is not the intended 
behaviour. 

I am using jula 4.11, fedora 23 - 64 bits.

Thanks for your help.