Mesh stretching - Linked PR for lfric core

[cjohnson-pi]

PR Summary

Sci/Tech Reviewer: @jameskent-metoffice
Code Reviewer: @mo-rickywong

linked MetOffice/lfric_core#270

Code Quality Checklist

• I have performed a self-review of my own code
• My code follows the project's style guidelines
• Comments have been included that aid understanding and enhance the readability of the code
• My changes generate no new warnings
• All automated checks in the CI pipeline have completed successfully

Testing

• I have tested this change locally, using the LFRic Apps rose-stem suite
• If any tests fail (rose-stem or CI) the reason is understood and acceptable (e.g. kgo changes)
• I have added tests to cover new functionality as appropriate (e.g. system tests, unit tests, etc.)
• Any new tests have been assigned an appropriate amount of compute resource and have been allocated to an appropriate testing group (i.e. the developer tests are for jobs which use a small amount of compute resource and complete in a matter of minutes)

trac.log

Test Suite Results - lfric_apps - test_stretch/run1

Suite Information

Item	Value
Suite Name	test_stretch/run1
Suite User	christine.johnson
Workflow Start	2026-03-13T14:53:08
Groups Run	suite_default

Dependency	Reference	Main Like
casim	MetOffice/[email protected]	True
jules	MetOffice/[email protected]	True
lfric_apps	cjohnson-pi/lfric_apps@stretching	False
lfric_core	cjohnson-pi/lfric_core@stretching	True
moci	MetOffice/[email protected]	True
SimSys_Scripts	MetOffice/[email protected]	True
socrates	MetOffice/[email protected]	True
socrates-spectral	MetOffice/[email protected]	True
ukca	MetOffice/[email protected]	True

Task Information

❌ failed tasks - 47

Task	State
check_gravity_wave_limited_300x4-BiP300x4-1000x2000_azspice_gnu_fast-debug-64bit	failed
check_gravity_wave_limited_300x4-BiP300x4-1000x2000_ex1a_gnu_fast-debug-64bit	failed
check_gravity_wave_limited_spherical_50x50_LAM50x50-2x2_azspice_gnu_fast-debug-64bit	failed
check_gravity_wave_limited_spherical_50x50_LAM50x50-2x2_ex1a_gnu_fast-debug-64bit	failed
check_gravity_wave_p1_75x4-BiP75x4-4000x2000_azspice_gnu_fast-debug-64bit	failed
check_gravity_wave_p1_75x4-BiP75x4-4000x2000_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_agnesi_hyd_cart-BiP120x8-2000x2000_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_agnesi_hyd_cart-BiP120x8-2000x2000_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_bryan_fritsch-dry-BiP200x10-100x100_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_bryan_fritsch-dry-BiP200x10-100x100_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_robert-moist-lam-BiP100x8-10x10_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_robert-moist-lam-BiP100x8-10x10_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_robert-moist-smag-BiP100x8-10x10_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_robert-moist-smag-BiP100x8-10x10_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_sbr_lam-n96_MG_lam_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_sbr_lam-n96_MG_lam_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_sbr_lam-n96_MG_lam_rotate_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_sbr_lam-n96_MG_lam_rotate_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_schar_cart-BiP200x8-500x500_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_schar_cart-BiP200x8-500x500_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_schar_cart-alt2-BiP100x4-1000x1000_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_schar_cart-alt2-BiP100x4-1000x1000_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_p0-BiP300x8-1000x2000_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_p0-BiP300x8-1000x2000_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_p1-BiP75x4-4000x2000_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_p1-BiP75x4-4000x2000_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_ph0pv1-BiP75x4-4000x2000_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_ph0pv1-BiP75x4-4000x2000_ex1a_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_ph1pv0-BiP75x4-4000x2000_azspice_gnu_fast-debug-64bit	failed
check_gungho_model_skamarock_klemp_gw_ph1pv0-BiP75x4-4000x2000_ex1a_gnu_fast-debug-64bit	failed
check_lfric2lfric_oasis_clim_gal9_C12-ral_seuk_C16_lam-lbc_azspice_gnu_fast-debug-64bit	failed
check_lfric2lfric_oasis_clim_gal9_C12-ral_seuk_C16_lam-lbc_ex1a_cce_fast-debug-64bit	failed
check_lfric2lfric_oasis_clim_gal9_C12-ral_seuk_C16_lam_azspice_gnu_fast-debug-64bit	failed
check_lfric2lfric_oasis_clim_gal9_C12-ral_seuk_C16_lam_ex1a_cce_fast-debug-64bit	failed
check_lfric2lfric_oasis_ral_seuk-C32_lam_MG_azspice_gnu_fast-debug-64bit	failed
check_lfric2lfric_oasis_ral_seuk-C32_lam_MG_ex1a_cce_fast-debug-64bit	failed
check_lfric2lfric_ral3-seuk_azspice_gnu_fast-debug-64bit	failed
check_lfric2lfric_ral3-seuk_ex1a_cce_fast-debug-64bit	failed
check_lfric2lfric_ral_seuk-C32_lam_MG_azspice_gnu_fast-debug-64bit	failed
check_lfric2lfric_ral_seuk-C32_lam_MG_ex1a_cce_fast-debug-64bit	failed
check_name_transport_sbr_hori_lam-n96_lam_azspice_gnu_fast-debug-64bit	failed
check_name_transport_sbr_hori_lam-n96_lam_ex1a_gnu_fast-debug-64bit	failed
check_transport_cylinder_xz_ffsl-BiP100x10-20x20_azspice_gnu_fast-debug-64bit	failed
check_transport_cylinder_xz_ffsl-BiP100x10-20x20_azspice_gnu_full-debug-64bit	failed
check_transport_cylinder_xz_ffsl-BiP100x10-20x20_ex1a_cce_fast-debug-64bit	failed
kgo_groups_checker	failed
validate_rose_meta	failed

✅ succeeded tasks - 1116

⌛ waiting tasks - 2

Task	State
housekeep_azspice	waiting
housekeep_ex1a	waiting

validate_rose_meta error message is regarding extra optional configurations that are not committed to this branch (i.e. left over from a git switch. Apologies).

Security Considerations

• I have reviewed my changes for potential security issues
• Sensitive data is properly handled (if applicable)
• Authentication and authorisation are properly implemented (if applicable)

Performance Impact

• Performance of the code has been considered and, if applicable, suitable performance measurements have been conducted

AI Assistance and Attribution

• Some of the content of this change has been produced with the assistance of Generative AI tool name (e.g., Met Office Github Copilot Enterprise, Github Copilot Personal, ChatGPT GPT-4, etc) and I have followed the Simulation Systems AI policy (including attribution labels)

Documentation

• Where appropriate I have updated documentation related to this change and confirmed that it builds correctly

PSyclone Approval

• If you have edited any PSyclone-related code (e.g. PSyKAl-lite, Kernel interface, optimisation scripts, LFRic data structure code) then please contact the TCD Team

Sci/Tech Review

• I understand this area of code and the changes being added
• The proposed changes correspond to the pull request description
• Documentation is sufficient (do documentation papers need updating)
• Sufficient testing has been completed

(Please alert the code reviewer via a tag when you have approved the SR)

Code Review

• All dependencies have been resolved
• Related Issues have been properly linked and addressed
• CLA compliance has been confirmed
• Code quality standards have been met
• Tests are adequate and have passed
• Documentation is complete and accurate
• Security considerations have been addressed
• Performance impact is acceptable

[thomasmelvin]

I'm happy with these changes from a code owner view point