# Help in using Callbacks

**URL:** <https://discourse.julialang.org/t/help-in-using-callbacks/60482>\
**Category:** Optimization (Mathematical)\
**Tags:** question\
**Created:** [May 3, 2021, 7:16pm UTC](https://discourse.julialang.org/t/help-in-using-callbacks/60482 "2021-05-03T19:16:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![RaquelSantos](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/raquelsantos/32/3668_2.png) [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Post date:** [May 3, 2021, 7:16pm UTC](https://discourse.julialang.org/t/help-in-using-callbacks/60482/1 "2021-05-03T19:16:30Z")

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Could someone please give me readings or small examples on how GLPK solver callbacks work?  
I would like to test on the model I’m building but I don’t know where to start.

Thanks!

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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:** [May 3, 2021, 7:19pm UTC](https://discourse.julialang.org/t/help-in-using-callbacks/60482/2 "2021-05-03T19:19:07Z")

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[https://jump.dev/JuMP.jl/stable/manual/callbacks/](https://jump.dev/JuMP.jl/stable/manual/callbacks/)  
[https://jump.dev/JuMP.jl/stable/tutorials/Mixed-integer%20linear%20programs/callbacks/](https://jump.dev/JuMP.jl/stable/tutorials/Mixed-integer%20linear%20programs/callbacks/)