# \#petsc

**URL:** https://community.geodynamics.org/tag/petsc/146.md

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## [Nonlinear solve did not converge with comments "Line search: Cubic step no good, shrinking lambda"](https://community.geodynamics.org/t/nonlinear-solve-did-not-converge-with-comments-line-search-cubic-step-no-good-shrinking-lambda/4316)

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**Author:** [@dian.k](https://community.geodynamics.org/u/dian.k)\
**Replies:** 2\
**Last updated:** [November 20, 2025, 2:32am UTC](https://community.geodynamics.org/t/nonlinear-solve-did-not-converge-with-comments-line-search-cubic-step-no-good-shrinking-lambda/4316 "2025-11-20T02:32:09Z")

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Dear Sir, I use Pylith 2.2.1 to model interseismic deformation (with displacement rate applied on the boundaries), with several faults embedded in the model. At first when I ran the model with six faults, the model ran…

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## [Problem running example](https://community.geodynamics.org/t/problem-running-example/3258)

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**Author:** [@chongjh11](https://community.geodynamics.org/u/chongjh11)\
**Replies:** 6\
**Last updated:** [February 5, 2024, 4:28pm UTC](https://community.geodynamics.org/t/problem-running-example/3258 "2024-02-05T16:28:12Z")

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Hello! I’m new to Pylith and I recently downloaded Pylith 4.0. I was going through the instructions in the document to run “box-2d” but I’m having problems running step01 with an error related to perhaps, petsc. I have …