# How to list all default parameters of optimizers

**URL:** <https://discourse.julialang.org/t/how-to-list-all-default-parameters-of-optimizers/82243>\
**Category:** Optimization (Mathematical)\
**Created:** [June 4, 2022, 7:12pm UTC](https://discourse.julialang.org/t/how-to-list-all-default-parameters-of-optimizers/82243 "2022-06-04T19:12:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tri](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tri/32/36918_2.png) [@Tri](https://discourse.julialang.org/u/Tri)\
**Post date:** [June 4, 2022, 7:12pm UTC](https://discourse.julialang.org/t/how-to-list-all-default-parameters-of-optimizers/82243/1 "2022-06-04T19:12:09Z")

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I know that I can change a parameter of optimizer by doing

> using JuMP  
> using Ipopt  
> model = Model(Ipopt.Optimizer)  
> set\_optimizer\_attribute(model, “print\_level”, 0)

How can I list all available parameters and their default values?

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<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [June 4, 2022, 9:02pm UTC](https://discourse.julialang.org/t/how-to-list-all-default-parameters-of-optimizers/82243/2 "2022-06-04T21:02:00Z")

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You can’t. You need to look at the documentation for each solver.

For example [Ipopt: Ipopt Options](https://coin-or.github.io/Ipopt/OPTIONS.html)