# Discarding pmap’s results (pforeach?)
**URL:** https://discourse.julialang.org/t/discarding-pmap-s-results-pforeach/101452
**Category:** General Usage
**Tags:** pmap
**Created:** [July 10, 2023, 8:37pm UTC](https://discourse.julialang.org/t/discarding-pmap-s-results-pforeach/101452 "2023-07-10T20:37:59Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@lmtzx9h4qqnt](https://discourse.julialang.org/u/lmtzx9h4qqnt)
#### Post date: [July 10, 2023, 8:37pm UTC](https://discourse.julialang.org/t/discarding-pmap-s-results-pforeach/101452/1 "2023-07-10T20:37:59Z")
I was wondering what the best way to use `pmap` (or something equivalent) is when I just want to do some operations in parallel without collecting any results in memory. Silly example:
```julia
julia> pmap(x -> println(x), 1:10)
1
2
3
4
5
6
7
8
9
10
10-element Vector{Nothing}:
nothing
nothing
nothing
nothing
nothing
nothing
nothing
nothing
nothing
nothing
```
Here, I get a `Vector{Nothing}` that I’m not actually interested in. It seems like this doesn’t actually use extra memory, even when it has a lot of elements. Is it true that a `Vector{Nothing}` uses constant memory independent of its length?
---
### Author:  [@tbeason](https://discourse.julialang.org/u/tbeason)
#### Post date: [July 10, 2023, 8:45pm UTC](https://discourse.julialang.org/t/discarding-pmap-s-results-pforeach/101452/2 "2023-07-10T20:45:45Z")
See also `Threads.foreach`
---
### Author:  [@lmtzx9h4qqnt](https://discourse.julialang.org/u/lmtzx9h4qqnt)
#### Post date: [July 10, 2023, 8:56pm UTC](https://discourse.julialang.org/t/discarding-pmap-s-results-pforeach/101452/3 "2023-07-10T20:56:46Z")
Yeah, something like that. But `Threads.foreach` is (presumably) only within a single process. So I suppose I’m looking for a `pforeach`?