# Julia workers: why so many processes? what is --bind-to doing?

**URL:** <https://discourse.julialang.org/t/julia-workers-why-so-many-processes-what-is-bind-to-doing/3200>\
**Category:** General Usage\
**Tags:** question\
**Created:** [April 13, 2017, 10:58am UTC](https://discourse.julialang.org/t/julia-workers-why-so-many-processes-what-is-bind-to-doing/3200 "2017-04-13T10:58:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![floswald](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/floswald/32/195_2.png) [@floswald](https://discourse.julialang.org/u/floswald)\
**Post date:** [April 13, 2017, 10:58am UTC](https://discourse.julialang.org/t/julia-workers-why-so-many-processes-what-is-bind-to-doing/3200/1 "2017-04-13T10:58:48Z")

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I just looked at my `htop` output after doing `addprocs(3)`. I was surprised by couple of things:

1. why are there so many julia processes?
2. What are all the options at the worker processes? I did `julia --help` but the `--bind-to` and `--worker` options don’t show up. What do they mean?

here is htop:

[](https://dl.dropboxusercontent.com/s/rde5eqkzylfmju4/Screenshot%202017-04-13%2012.55.15.png?dl=0)

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**Author:** ![vchuravy](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/vchuravy/32/8_2.png) [@vchuravy](https://discourse.julialang.org/u/vchuravy)\
**Post date:** [April 13, 2017, 9:43pm UTC](https://discourse.julialang.org/t/julia-workers-why-so-many-processes-what-is-bind-to-doing/3200/2 "2017-04-13T21:43:10Z")

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If you switch into tree view you can see that a number of displayed processes are dependent processes/childs (in my case 4, but that might vary according to the number of CPUs your system has) these workers go away when I set `OPENBLAS_NUM_THREADS=1` and `UV_THREADPOOL_SIZE=1`.