# Distributed arrays in for loop
**URL:** https://discourse.julialang.org/t/distributed-arrays-in-for-loop/118728
**Category:** General Usage
**Tags:** parallel
**Created:** [August 28, 2024, 5:48pm UTC](https://discourse.julialang.org/t/distributed-arrays-in-for-loop/118728 "2024-08-28T17:48:57Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@clempe](https://discourse.julialang.org/u/clempe)
#### Post date: [August 28, 2024, 5:48pm UTC](https://discourse.julialang.org/t/distributed-arrays-in-for-loop/118728/1 "2024-08-28T17:48:57Z")
Hi, I’m trying to get distributed arrays to work correctly for my distributed for loop. I’m getting this weird outcome where not all workers do their task always, even though I know they’ve been assigned correctly (using procs). Not sure what’s going on. Here a MWE:
```julia
using Distributed
addprocs(4)
@everywhere begin
using DistributedArrays
result_D = dzeros(Float64,(2,4), workers()[1:4],[1,4])
initq = [i*ones(2,1) for i in 1:4]
@sync @distributed for ele in initq
res_local = localpart(result_D)
res_local .= ele
end
end
result = convert(Array,result_D)
```
When I run this, the results are inconsistent: sometimes the whole array stays empty, sometimes one worker does a job, sometimes a few. What could be the issue?
---
### Author:  [@abraemer](https://discourse.julialang.org/u/abraemer)
#### Post date: [August 28, 2024, 8:54pm UTC](https://discourse.julialang.org/t/distributed-arrays-in-for-loop/118728/2 "2024-08-28T20:54:25Z")
I think you shouldn’t define the distributed array and run the `@distributed` loop inside the `@everywhere` block. This might cause the issues you see, since somehow every worker ends up allocating their own array and I am not sure which worker will then write where.
---
### Author:  [@clempe](https://discourse.julialang.org/u/clempe)
#### Post date: [August 28, 2024, 9:17pm UTC](https://discourse.julialang.org/t/distributed-arrays-in-for-loop/118728/3 "2024-08-28T21:17:15Z")
Thank you @abraemer ! This indeed did the trick. Here the working version:
```julia
using Distributed
addprocs(4)
@everywhere begin
using Distributed, DistributedArrays
initq = [i*ones(2,1) for i in 1:4]
end
result_D = dzeros(Float64,(2,8), workers()[1:4],[1,4])
@sync @distributed for ele in initq
res_local = localpart(result_D)
res_local .= ele
end
result = convert(Array,result_D)
```