# Need help with NLopt AUGLAG termination criteria

**URL:** https://discourse.julialang.org/t/need-help-with-nlopt-auglag-termination-criteria/14189
**Category:** Optimization (Mathematical)
**Created:** [August 28, 2018, 12:57pm UTC](https://discourse.julialang.org/t/need-help-with-nlopt-auglag-termination-criteria/14189 "2018-08-28T12:57:49Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![ivborissov](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ivborissov/32/2841_2.png) [@ivborissov](https://discourse.julialang.org/u/ivborissov)
#### Post date: [August 28, 2018, 12:57pm UTC](https://discourse.julialang.org/t/need-help-with-nlopt-auglag-termination-criteria/14189/1 "2018-08-28T12:57:49Z")

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Hi,  
I have an optimization problem with equality constraints and I use `NLopt` `LN_AUGLAG` solver with derivative-free local solver like `LN_NELDERMEAD` or `LN_SBPLX`. However I don’t have a clear understanding how to choose tolerance for both local and `LN_AUGLAG` solvers. Is there any intuition how they should correlate?  
Ex, I want to find `min_x` of an objective function `f(x)` with constraints`g(x)=0.` And I know that there is a single solution to this problem.