# Optimization level when running files with include() in the REPL
**URL:** https://discourse.julialang.org/t/optimization-level-when-running-files-with-include-in-the-repl/30566
**Category:** General Usage
**Created:** [October 31, 2019, 11:20pm UTC](https://discourse.julialang.org/t/optimization-level-when-running-files-with-include-in-the-repl/30566 "2019-10-31T23:20:20Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@aortizb](https://discourse.julialang.org/u/aortizb)
#### Post date: [October 31, 2019, 11:20pm UTC](https://discourse.julialang.org/t/optimization-level-when-running-files-with-include-in-the-repl/30566/1 "2019-10-31T23:20:21Z")
I know from the user manual that:
```julia
julia -O -- file.jl
```
has a default optimization level of 3.
I have few questions regarding the optimization level:
If “file.jl” is run in the REPL using:
```julia
include("file.jl")
```
1. what is the optimization level used?
2. regarding 1), can this optimization level be changed so that include(“file.jl”) is run with a specified optimization level?
Thanks!
---
### Author:  [@ffevotte](https://discourse.julialang.org/u/ffevotte)
#### Post date: [November 2, 2019, 12:30am UTC](https://discourse.julialang.org/t/optimization-level-when-running-files-with-include-in-the-repl/30566/2 "2019-11-02T00:30:15Z")
As far as i know, the optimization level is attached to the julia process, not the source file.
If you run `julia -O3 file.jl`, then all the code in `file.jl` will be compiled with the `-O3` optimization level.
Likewise, if you run `julia -O3`, and then in the REPL:
```julia
include("file.jl")
```
the code in `file.jl` will also be compiled with the `-O3` optimization level.
I do not know of any way to dynamically or temporarily change the optimization level of a running Julia process / REPL.