[Benjamin Went (MetBenjaminWent)]

There have been improvments to PSyclone which allow us to more easily 'Transmute' physics source.

The maximal parallel transformation created by STFC has already been added to the local script for the boundary layer, however some of the larger or complex files are relying their origonal OMP in source.
This PR updates those.

This changeset extends the PSyclone CPU coverage, with 3x exceptions still:

• excf_nl_9c - See Further Refactor of excf_nl_9c #571
• ex_coef - See ex_coef script #834
• kmkhz_9c - See kmkhz_9c script #835

Despite some changes in how the OMP is placed in the files by the Transformations (The number of parallel sections in bl_expl2 has gone up for example), the perfomance impact at both the alg and higher is negligable, meaning these scripts are sufficient automatic coverage of the source.

After/Before	Caliper	Min	Mean	Max
bl__after_3n_1T_run1.txt:	bl.implicit	5.06404	6.82949	7.96217
bl__after_3n_2T_run1.txt:	bl.implicit	5.76733	7.41323	8.42424
bl__after_3n_4T_run1.txt:	bl.implicit	7.1357	7.96703	8.90106
bl__before_3n_1T_run1.txt:	bl.implicit	4.97996	6.82163	8.03526
bl__before_3n_2T_run1.txt:	bl.implicit	5.6279	7.40948	8.56902
bl__before_3n_4T_run1.txt:	bl.implicit	6.94537	7.91051	8.66165

After/Before	Caliper	Min	Mean	Max
bl__after_3n_1T_run1.txt:	bl.implicit	5.06404	6.82949	7.96217
bl__after_3n_2T_run1.txt:	bl.implicit	5.76733	7.41323	8.42424
bl__after_3n_4T_run1.txt:	bl.implicit	7.1357	7.96703	8.90106
bl__before_3n_1T_run1.txt:	bl.implicit	4.97996	6.82163	8.03526
bl__before_3n_2T_run1.txt:	bl.implicit	5.6279	7.40948	8.56902
bl__before_3n_4T_run1.txt:	bl.implicit	6.94537	7.91051	8.66165

After/Before	Caliper	Min	Mean	Max
bl__after_3n_1T_run1.txt:	fast_physics	20.333	24.93297	27.5066
bl__after_3n_2T_run1.txt:	fast_physics	23.9748	27.31122	29.1418
bl__after_3n_4T_run1.txt:	fast_physics	27.4751	30.02124	31.5186
bl__before_3n_1T_run1.txt:	fast_physics	20.1735	24.87263	27.4821
bl__before_3n_2T_run1.txt:	fast_physics	23.9464	27.2097	29.0277
bl__before_3n_4T_run1.txt:	fast_physics	26.9461	29.99026	31.5474

After/Before	Caliper	Min	Mean	Max
bl__after_3n_1T_run1.txt:	slow_physics	55.217	57.60193	58.8954
bl__after_3n_2T_run1.txt:	slow_physics	55.6022	56.40347	56.6336
bl__after_3n_4T_run1.txt:	slow_physics	56.8093	56.95894	57.0687
bl__before_3n_1T_run1.txt:	slow_physics	54.919	56.27117	57.0295
bl__before_3n_2T_run1.txt:	slow_physics	55.4524	55.927	56.1519
bl__before_3n_4T_run1.txt:	slow_physics	56.8792	57.03376	57.1574

PR Summary

Sci/Tech Reviewer: Hacka Fett (@christophermaynard)
Code Reviewer:

Issue: #833
Umbrella Issue: #758
Top Umbrella: #106

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 - bdylyr_psyclone_further_1/run12

Suite Information

Test Suite Results - lfric_apps - bdylyr_psyclone_further_1/run13

Suite Information

Item	Value
Suite Name	bdylyr_psyclone_further_1/run13
Suite User	benjamin.went
Workflow Start	2026-09-30T09:33:08
Groups Run	all

Dependency	Reference	Main Like
casim	MetOffice/casim@2026.07.1	True
jules	MetOffice/jules@c22aeea	True
lfric_apps	MetBenjaminWent/lfric_apps@bdylyr_psyclone_further_1	False
lfric_core	MetOffice/lfric_core@220a00c	True
moci	MetOffice/moci@2026.07.1	True
SimSys_Scripts	MetOffice/SimSys_Scripts@77a5166	True
socrates	MetOffice/socrates@2026.07.1	True
socrates-spectral	MetOffice/socrates-spectral@2026.07.1	True
ukca	MetOffice/ukca@c372b36	True

Task Information

❌ failed tasks - 2

Task	State
run_gungho_model_robert-moist-smag-BiP100x8-10x10_azspice_gnu_fast-debug-64bit	failed
run_shallow_water_williamson5_vi-C24_azspice_gnu_fast-debug-64bit	failed

✅ succeeded tasks - 1605

Item	Value
Suite Name	bdylyr_psyclone_further_1/run12
Suite User	benjamin.went
Workflow Start	2026-09-30T09:31:48
Groups Run	ex1a_omp_developer

Dependency	Reference	Main Like
casim	MetOffice/casim@2026.07.1	True
jules	MetOffice/jules@c22aeea	True
lfric_apps	MetBenjaminWent/lfric_apps@bdylyr_psyclone_further_1	False
lfric_core	MetOffice/lfric_core@220a00c	True
moci	MetOffice/moci@2026.07.1	True
SimSys_Scripts	MetOffice/SimSys_Scripts@77a5166	True
socrates	MetOffice/socrates@2026.07.1	True
socrates-spectral	MetOffice/socrates-spectral@2026.07.1	True
ukca	MetOffice/ukca@c372b36	True

Task Information

✅ succeeded tasks - 51

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 HPC Optimisation 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

[Benjamin Went (MetBenjaminWent)]

ex_coef :

• Seems to trip the C12 KGO issues again, like in the origonal hand coded changes, see Remove j loop ex_coef #216. This was due to CCE opt, but could be PSyclone too. Needs further verification.
• We could wait until all bdounary layer changes go on and then update, see conv in Refactor BL use GH Copliot to remove the j index #742 for further context

kmkhz_9c:
Timing of kmkhz_9c as it takes a while running it in the VDI. PSyclone is now parallel in the build, so most of this should be hidden, however this may be disrptive on the build time.

touch time_kmkhz_9c_psy.sh
#!/bin/bash
printf 'Starting psyclone run\n'
/usr/bin/time -v psyclone -l all -s ../../../../applications/lfric_atm/optimisation/meto-ex1a/transmute/boundary_layer/local.py -o gen_kmkhz_9c.F90 kmkhz_9c.F90 > output.txt
printf '\nFinished psyclone run\n'

User time (seconds): 261.30
System time (seconds): 0.69
Percent of CPU this job got: 97%
Elapsed (wall clock) time (h:mm:ss or m:ss): 4:27.95

[Benjamin Went (MetBenjaminWent)]

Profiling: main...MetBenjaminWent:lfric_apps:vernier_production_run

[Matthew Hambley (MatthewHambley)]

Code owner (build system) review: Change just adds to an existing list in the fashion already established.