Logger

[RemDelaporteMathurin]

Description

Do not merge before #1060

Summary

Adds a default custom monitor to the SNES solver. It also adds a custom convergence test for more control.

7:32.096] [info] Requesting connectivity (1, 0) - (0, 0)
[2026-02-13 16:17:32.097] [info] SNES iter=0 ; rnorm=1.00312e+06 (atol=1e-05) ; relative_residual=inf (rtol=1e-10) ; stepsize_rel=inf (stol=1.49012e-10)
[2026-02-13 16:17:32.126] [info] SNES iter=1 ; rnorm=3.63856e-06 (atol=1e-05) ; relative_residual=3.62723e-12 (rtol=1e-10) ; stepsize_rel=4.05216e-02 (stol=1.49012e-10)
[2026-02-13 16:17:32.134] [info] Requesting connectivity (0, 0) - (1, 0)
[2026-02-13 16:17:32.134] [info] Requesting connectivity (1, 0) - (0, 0)
[2026-02-13 16:17:32.134] [info] Requesting connectivity (0, 0) - (1, 0)
[2026-02-13 16:17:32.134] [info] Requesting connectivity (1, 0) - (0, 0)
[2026-02-13 16:17:32.135] [info] SNES iter=0 ; rnorm=8.76546e+05 (atol=1e-05) ; relative_residual=inf (rtol=1e-10) ; stepsize_rel=inf (stol=1.49012e-10)
[2026-02-13 16:17:32.182] [info] SNES iter=1 ; rnorm=5.06478e-06 (atol=1e-05) ; relative_residual=5.77811e-12 (rtol=1e-10) ; stepsize_rel=3.46456e-02 (stol=1.49012e-10)
[2026-02-13 16:17:32.190] [info] Requesting connectivity (0, 0) - (1, 0)

Usage:

Simply set the log level to INFO/DEBUG

from dolfinx import log

log.set_log_level(log.LogLevel.INFO)

Related Issues

closing #1062

Motivation and Context

This gives users better understanding on the solver behaviour by logging norms and tolerances for the SNES iterations and KSP iterations

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🔨 Code refactoring (no functional changes, no API changes)
• 📝 Documentation update
• ✅ Test update (adding missing tests or correcting existing tests)
• 🔧 Build/CI configuration change

Testing

• All existing tests pass locally (pytest)
• I have added new tests that prove my fix is effective or that my feature works

Code Quality Checklist

• My code follows the code style of this project (Ruff formatted: ruff format .)
• My code passes linting checks (ruff check .)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

Documentation

• I have updated the documentation accordingly (if applicable)
• I have added docstrings to new functions/classes following the project conventions

Breaking Changes

Screenshots/Examples

Additional Notes

[codecov]

Codecov Report

❌ Patch coverage is 93.06931% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.82%. Comparing base (fcda1ad) to head (08f01a6).
⚠️ Report is 3 commits behind head on fenicsx.

Files with missing lines	Patch %	Lines
src/festim/hydrogen_transport_problem.py	91.66%	5 Missing ⚠️
src/festim/helpers.py	93.75%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           fenicsx    #1070      +/-   ##
===========================================
- Coverage    94.90%   94.82%   -0.09%     
===========================================
  Files           44       44              
  Lines         3102     3170      +68     
===========================================
+ Hits          2944     3006      +62     
- Misses         158      164       +6     

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[RemDelaporteMathurin]

In order to propagate the change to the mixed domain class I need #1060