# \#ampls

**URL:** https://discuss.ampl.com/tag/ampls/51.md

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## [Maxtime option doesn't always work?](https://discuss.ampl.com/t/maxtime-option-doesnt-always-work/2068)

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**Author:** [@jerron](https://discuss.ampl.com/u/jerron)\
**Replies:** 9\
**Last updated:** [March 9, 2025, 7:08pm UTC](https://discuss.ampl.com/t/maxtime-option-doesnt-always-work/2068 "2025-03-09T19:08:28Z")

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In my code I put something like following. Most time they worked. The job did return at about the set time. But quite often they didn’t. They seem to hang in the server after 8 hours and got killed. And quite often resub…

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## [Suggestions to improve callback performance in amplpy (amplpy-cplex)](https://discuss.ampl.com/t/suggestions-to-improve-callback-performance-in-amplpy-amplpy-cplex/586)

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**Author:** [@Jonathan](https://discuss.ampl.com/u/Jonathan)\
**Replies:** 2\
**Last updated:** [June 8, 2023, 10:04pm UTC](https://discuss.ampl.com/t/suggestions-to-improve-callback-performance-in-amplpy-amplpy-cplex/586 "2023-06-08T22:04:38Z")

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Hi! I’ve implemented a callback in amplpy to change the gap after a given number of explored nodes, and I notice three things that I would like to discuss here: With the callback the parallel mode is not applied, and …