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Generalise support for netcdf load+save of "special" attributes #6566

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@pp-mo pp-mo commented Jul 16, 2025

Closes SciTools/iris-grib#596 and SciTools/iris-grib#674

Ties together the handling of STASH, GRIB_PARAM and "ukmo__process_flags" attributes,
which all require special handling on netcdf load+save.

By design, should preserve existing behaviour.
But I have tried to generalise the handling,
( and also rationalise behaviour a wee bit, at least for "ukmo__process_flags" -- though that one is quite obscure ).

TODO:

  • ?probably? ditch the @staticmethod + use self more
  • make sure all types also support the "plain" string formats (as found in the files) inside Iris, as well as the 'convenience' forms
    • e.g. in place of a STASH object, can have just the string like "m01s02i123" (str form) or "STASH(model=...)" (repr form) .
    • ... and similar for the other 2 types
  • testing (TBD) ...

(but first, just let's see if it breaks anything I haven't already tried)

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codecov bot commented Jul 16, 2025

Codecov Report

Attention: Patch coverage is 51.61290% with 75 lines in your changes missing coverage. Please review.

Project coverage is 89.66%. Comparing base (f8030d0) to head (79b8814).
Report is 6 commits behind head on main.

Files with missing lines Patch % Lines
lib/iris/fileformats/netcdf/_attribute_handlers.py 50.67% 71 Missing and 2 partials ⚠️
lib/iris/fileformats/netcdf/saver.py 71.42% 2 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #6566      +/-   ##
==========================================
- Coverage   89.90%   89.66%   -0.24%     
==========================================
  Files          90       91       +1     
  Lines       24153    24310     +157     
  Branches     4496     4504       +8     
==========================================
+ Hits        21714    21798      +84     
- Misses       1679     1751      +72     
- Partials      760      761       +1     

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@pp-mo pp-mo added the benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts label Jul 16, 2025
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⏱️ Performance Benchmark Report: 71c7bc4

Performance shifts

Full benchmark results

Benchmarks that have stayed the same:

| Change   | Before [13e3d9f3]    | After [71c7bc41]    |   Ratio | Benchmark (Parameter)                                                                       |
|----------|----------------------|---------------------|---------|---------------------------------------------------------------------------------------------|
|          | 20.8±0.2ms           | 21.0±0.3ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(False)                              |
|          | 52.7±0.5ms           | 52.4±0.9ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_COUNT(True)                               |
|          | 35.3±0.6ms           | 35.0±0.5ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(False)                    |
|          | 170±3ms              | 167±1ms             |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_FAST_PERCENTILE(True)                     |
|          | 22.8±0.3ms           | 22.9±0.3ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(False)                              |
|          | 31.9±0.3ms           | 32.0±0.5ms          |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_GMEAN(True)                               |
|          | 23.2±0.3ms           | 23.0±0.4ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(False)                              |
|          | 31.8±0.2ms           | 31.9±0.2ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_HMEAN(True)                               |
|          | 20.8±0.3ms           | 20.7±0.4ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MAX(False)                                |
|          | 44.7±0.9ms           | 44.7±0.6ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MAX(True)                                 |
|          | 126±1ms              | 125±0.8ms           |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(False)                            |
|          | 127±2ms              | 127±2ms             |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MAX_RUN(True)                             |
|          | 22.0±0.3ms           | 21.9±0.3ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(False)                               |
|          | 48.8±0.8ms           | 47.9±0.7ms          |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_MEAN(True)                                |
|          | 23.5±0.2ms           | 23.0±0.2ms          |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(False)                             |
|          | 58.6±1ms             | 57.6±0.7ms          |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_MEDIAN(True)                              |
|          | 21.2±0.2ms           | 20.6±0.1ms          |    0.97 | aggregate_collapse.Aggregation.time_aggregated_by_MIN(False)                                |
|          | 44.7±0.8ms           | 44.9±0.5ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_MIN(True)                                 |
|          | 1.07±0.01s           | 1.07±0.01s          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(False)                               |
|          | 1.06±0.01s           | 1.06±0.01s          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_PEAK(True)                                |
|          | 209±2ms              | 206±3ms             |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(False)                         |
|          | 341±6ms              | 340±8ms             |    1    | aggregate_collapse.Aggregation.time_aggregated_by_PERCENTILE(True)                          |
|          | 22.2±0.1ms           | 21.8±0.3ms          |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(False)                         |
|          | 30.4±0.4ms           | 30.2±0.4ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_PROPORTION(True)                          |
|          | 22.6±0.1ms           | 22.2±0.2ms          |    0.98 | aggregate_collapse.Aggregation.time_aggregated_by_RMS(False)                                |
|          | 59.5±1ms             | 59.6±1ms            |    1    | aggregate_collapse.Aggregation.time_aggregated_by_RMS(True)                                 |
|          | 22.9±0.2ms           | 22.7±0.3ms          |    1    | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(False)                            |
|          | 61.7±0.7ms           | 61.8±1ms            |    1    | aggregate_collapse.Aggregation.time_aggregated_by_STD_DEV(True)                             |
|          | 23.0±0.2ms           | 22.7±0.2ms          |    0.99 | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(False)                           |
|          | 57.8±1ms             | 58.1±1ms            |    1.01 | aggregate_collapse.Aggregation.time_aggregated_by_VARIANCE(True)                            |
|          | 7.88±0.07ms          | 7.80±0.07ms         |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(False)                               |
|          | 22.0±0.7ms           | 22.1±0.6ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_COUNT(True)                                |
|          | 19.9±0.2ms           | 20.2±0.2ms          |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(False)                     |
|          | 124±2ms              | 126±1ms             |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_FAST_PERCENTILE(True)                      |
|          | 8.26±0.1ms           | 8.21±0.1ms          |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(False)                               |
|          | 20.4±0.7ms           | 19.9±0.6ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_GMEAN(True)                                |
|          | 8.29±0.09ms          | 8.26±0.08ms         |    1    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(False)                               |
|          | 20.7±0.6ms           | 20.7±0.6ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_HMEAN(True)                                |
|          | 7.76±0.1ms           | 7.73±0.09ms         |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MAX(False)                                 |
|          | 20.7±0.6ms           | 20.9±0.6ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MAX(True)                                  |
|          | 24.3±0.3ms           | 24.4±0.3ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(False)                             |
|          | 34.6±0.5ms           | 34.8±0.6ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MAX_RUN(True)                              |
|          | 8.16±0.2ms           | 8.07±0.2ms          |    0.99 | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(False)                                |
|          | 21.0±0.6ms           | 21.3±0.5ms          |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_MEAN(True)                                 |
|          | 9.22±0.07ms          | 9.06±0.1ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(False)                              |
|          | 23.1±0.5ms           | 23.5±0.7ms          |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_MEDIAN(True)                               |
|          | 7.70±0.06ms          | 7.74±0.08ms         |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_MIN(False)                                 |
|          | 20.4±0.6ms           | 20.9±0.4ms          |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_MIN(True)                                  |
|          | 532±2ms              | 531±4ms             |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(False)                                |
|          | 545±5ms              | 543±3ms             |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PEAK(True)                                 |
|          | 45.4±0.5ms           | 44.6±0.5ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(False)                          |
|          | 133±0.9ms            | 133±0.6ms           |    1    | aggregate_collapse.Aggregation.time_collapsed_by_PERCENTILE(True)                           |
|          | 8.03±0.1ms           | 8.21±0.07ms         |    1.02 | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(False)                          |
|          | 20.2±0.4ms           | 19.8±0.7ms          |    0.98 | aggregate_collapse.Aggregation.time_collapsed_by_PROPORTION(True)                           |
|          | 8.11±0.08ms          | 8.15±0.08ms         |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_RMS(False)                                 |
|          | 22.5±0.6ms           | 22.6±0.7ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_RMS(True)                                  |
|          | 8.30±0.05ms          | 8.27±0.1ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(False)                             |
|          | 22.2±0.6ms           | 22.4±0.6ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_STD_DEV(True)                              |
|          | 8.37±0.06ms          | 8.38±0.1ms          |    1    | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(False)                            |
|          | 21.8±0.6ms           | 22.0±0.4ms          |    1.01 | aggregate_collapse.Aggregation.time_collapsed_by_VARIANCE(True)                             |
|          | 22.7±0.3ms           | 22.8±0.2ms          |    1    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(False)                     |
|          | 82.2±1ms             | 82.3±0.8ms          |    1    | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_MEAN(True)                      |
|          | 22.5±0.2ms           | 22.3±0.3ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(False)                      |
|          | 95.8±1ms             | 93.5±1ms            |    0.98 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_RMS(True)                       |
|          | 21.4±0.2ms           | 21.2±0.3ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(False)                      |
|          | 55.9±0.8ms           | 55.4±0.6ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_aggregated_by_SUM(True)                       |
|          | 8.42±0.2ms           | 8.45±0.1ms          |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(False)                      |
|          | 27.4±0.6ms           | 27.1±0.8ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_MEAN(True)                       |
|          | 8.26±0.1ms           | 8.22±0.1ms          |    0.99 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(False)                       |
|          | 28.6±0.7ms           | 29.3±0.8ms          |    1.02 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_RMS(True)                        |
|          | 8.05±0.1ms           | 8.07±0.09ms         |    1    | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(False)                       |
|          | 23.1±0.8ms           | 22.6±0.7ms          |    0.98 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_SUM(True)                        |
|          | 220±3ms              | 217±2ms             |    0.98 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(False)               |
|          | 276±3ms              | 278±3ms             |    1.01 | aggregate_collapse.WeightedAggregation.time_w_collapsed_by_WPERCENTILE(True)                |
|          | 1.14±0.02ms          | 1.14±0.01ms         |    1    | cube.CubeCreation.time_create(False, 'construct')                                           |
|          | 398±9μs              | 394±3μs             |    0.99 | cube.CubeCreation.time_create(False, 'instantiate')                                         |
|          | 1.97±0.03ms          | 1.94±0.02ms         |    0.99 | cube.CubeCreation.time_create(True, 'construct')                                            |
|          | 1.36±0.01ms          | 1.37±0.01ms         |    1.01 | cube.CubeCreation.time_create(True, 'instantiate')                                          |
|          | 91.1±1ms             | 92.6±0.9ms          |    1.02 | cube.CubeEquality.time_equality(False, False, 'all_equal')                                  |
|          | 25.0±1ms             | 24.6±2ms            |    0.98 | cube.CubeEquality.time_equality(False, False, 'coord_inequality')                           |
|          | 106±2ms              | 105±1ms             |    0.99 | cube.CubeEquality.time_equality(False, False, 'data_inequality')                            |
|          | 17.5±0.2μs           | 17.3±0.2μs          |    0.99 | cube.CubeEquality.time_equality(False, False, 'metadata_inequality')                        |
|          | 97.1±0.8ms           | 95.0±0.9ms          |    0.98 | cube.CubeEquality.time_equality(False, True, 'all_equal')                                   |
|          | 27.8±0.5ms           | 27.5±0.3ms          |    0.99 | cube.CubeEquality.time_equality(False, True, 'coord_inequality')                            |
|          | 109±2ms              | 108±1ms             |    0.99 | cube.CubeEquality.time_equality(False, True, 'data_inequality')                             |
|          | 17.5±0.3μs           | 17.5±0.2μs          |    1    | cube.CubeEquality.time_equality(False, True, 'metadata_inequality')                         |
|          | 178±1ms              | 176±2ms             |    0.99 | cube.CubeEquality.time_equality(True, False, 'all_equal')                                   |
|          | 66.5±1ms             | 66.5±0.9ms          |    1    | cube.CubeEquality.time_equality(True, False, 'coord_inequality')                            |
|          | 206±1ms              | 207±2ms             |    1.01 | cube.CubeEquality.time_equality(True, False, 'data_inequality')                             |
|          | 52.1±0.2μs           | 52.1±0.5μs          |    1    | cube.CubeEquality.time_equality(True, False, 'metadata_inequality')                         |
|          | 254±5ms              | 253±3ms             |    0.99 | cube.CubeEquality.time_equality(True, True, 'all_equal')                                    |
|          | 142±3ms              | 140±2ms             |    0.98 | cube.CubeEquality.time_equality(True, True, 'coord_inequality')                             |
|          | 285±2ms              | 283±4ms             |    0.99 | cube.CubeEquality.time_equality(True, True, 'data_inequality')                              |
|          | 361±4μs              | 366±3μs             |    1.01 | cube.CubeEquality.time_equality(True, True, 'metadata_inequality')                          |
|          | 782±20μs             | 776±4μs             |    0.99 | import_iris.Iris.time__concatenate                                                          |
|          | 181±3μs              | 183±2μs             |    1.01 | import_iris.Iris.time__constraints                                                          |
|          | 114±4μs              | 115±1μs             |    1    | import_iris.Iris.time__data_manager                                                         |
|          | 91.0±0.8μs           | 92.1±0.4μs          |    1.01 | import_iris.Iris.time__deprecation                                                          |
|          | 165±2μs              | 161±2μs             |    0.98 | import_iris.Iris.time__lazy_data                                                            |
|          | 881±6μs              | 881±20μs            |    1    | import_iris.Iris.time__merge                                                                |
|          | 74.6±0.4μs           | 74.3±2μs            |    1    | import_iris.Iris.time__representation                                                       |
|          | 606±7μs              | 609±6μs             |    1    | import_iris.Iris.time_analysis                                                              |
|          | 139±0.7μs            | 140±2μs             |    1.01 | import_iris.Iris.time_analysis__area_weighted                                               |
|          | 107±2μs              | 106±1μs             |    0.99 | import_iris.Iris.time_analysis__grid_angles                                                 |
|          | 247±3μs              | 246±3μs             |    1    | import_iris.Iris.time_analysis__interpolation                                               |
|          | 190±5μs              | 190±1μs             |    1    | import_iris.Iris.time_analysis__regrid                                                      |
|          | 110±2μs              | 111±2μs             |    1.01 | import_iris.Iris.time_analysis__scipy_interpolate                                           |
|          | 136±2μs              | 134±2μs             |    0.99 | import_iris.Iris.time_analysis_calculus                                                     |
|          | 322±1μs              | 319±4μs             |    0.99 | import_iris.Iris.time_analysis_cartography                                                  |
|          | 89.9±1μs             | 92.1±0.7μs          |    1.02 | import_iris.Iris.time_analysis_geomerty                                                     |
|          | 209±2μs              | 210±1μs             |    1    | import_iris.Iris.time_analysis_maths                                                        |
|          | 92.6±0.9μs           | 94.2±2μs            |    1.02 | import_iris.Iris.time_analysis_stats                                                        |
|          | 172±2μs              | 171±0.9μs           |    1    | import_iris.Iris.time_analysis_trajectory                                                   |
|          | 313±3μs              | 314±2μs             |    1    | import_iris.Iris.time_aux_factory                                                           |
|          | 79.9±2μs             | 80.7±1μs            |    1.01 | import_iris.Iris.time_common                                                                |
|          | 165±2μs              | 161±2μs             |    0.98 | import_iris.Iris.time_common_lenient                                                        |
|          | 1.33±0.02ms          | 1.34±0.01ms         |    1.01 | import_iris.Iris.time_common_metadata                                                       |
|          | 168±2μs              | 168±1μs             |    1    | import_iris.Iris.time_common_mixin                                                          |
|          | 1.15±0ms             | 1.15±0.02ms         |    1.01 | import_iris.Iris.time_common_resolve                                                        |
|          | 196±2μs              | 197±0.8μs           |    1.01 | import_iris.Iris.time_config                                                                |
|          | 125±1μs              | 127±0.9μs           |    1.02 | import_iris.Iris.time_coord_categorisation                                                  |
|          | 373±2μs              | 374±7μs             |    1    | import_iris.Iris.time_coord_systems                                                         |
|          | 746±4μs              | 750±3μs             |    1.01 | import_iris.Iris.time_coords                                                                |
|          | 674±4μs              | 676±5μs             |    1    | import_iris.Iris.time_cube                                                                  |
|          | 235±1μs              | 237±2μs             |    1.01 | import_iris.Iris.time_exceptions                                                            |
|          | 74.9±0.8μs           | 74.7±1μs            |    1    | import_iris.Iris.time_experimental                                                          |
|          | 181±1μs              | 181±2μs             |    1    | import_iris.Iris.time_fileformats                                                           |
|          | 251±3μs              | 253±3μs             |    1.01 | import_iris.Iris.time_fileformats__ff                                                       |
|          | 2.56±0.03ms          | 2.58±0.04ms         |    1.01 | import_iris.Iris.time_fileformats__ff_cross_references                                      |
|          | 75.1±0.8μs           | 75.3±2μs            |    1    | import_iris.Iris.time_fileformats__pp_lbproc_pairs                                          |
|          | 112±1μs              | 112±1μs             |    1.01 | import_iris.Iris.time_fileformats_abf                                                       |
|          | 424±5μs              | 423±4μs             |    1    | import_iris.Iris.time_fileformats_cf                                                        |
|          | 4.68±0.03ms          | 4.71±0.04ms         |    1.01 | import_iris.Iris.time_fileformats_dot                                                       |
|          | 71.3±0.2μs           | 71.2±0.7μs          |    1    | import_iris.Iris.time_fileformats_name                                                      |
|          | 248±2μs              | 247±1μs             |    0.99 | import_iris.Iris.time_fileformats_name_loaders                                              |
|          | 114±1μs              | 114±0.8μs           |    1    | import_iris.Iris.time_fileformats_netcdf                                                    |
|          | 119±0.6μs            | 121±0.7μs           |    1.01 | import_iris.Iris.time_fileformats_nimrod                                                    |
|          | 209±1μs              | 209±2μs             |    1    | import_iris.Iris.time_fileformats_nimrod_load_rules                                         |
|          | 804±10μs             | 779±4μs             |    0.97 | import_iris.Iris.time_fileformats_pp                                                        |
|          | 174±2μs              | 177±3μs             |    1.01 | import_iris.Iris.time_fileformats_pp_load_rules                                             |
|          | 136±2μs              | 136±0.6μs           |    1    | import_iris.Iris.time_fileformats_pp_save_rules                                             |
|          | 534±5μs              | 540±8μs             |    1.01 | import_iris.Iris.time_fileformats_rules                                                     |
|          | 221±5μs              | 221±4μs             |    1    | import_iris.Iris.time_fileformats_structured_array_identification                           |
|          | 79.8±0.1μs           | 81.9±0.3μs          |    1.03 | import_iris.Iris.time_fileformats_um                                                        |
|          | 154±3μs              | 155±5μs             |    1    | import_iris.Iris.time_fileformats_um__fast_load                                             |
|          | 139±3μs              | 136±2μs             |    0.98 | import_iris.Iris.time_fileformats_um__fast_load_structured_fields                           |
|          | 71.7±0.7μs           | 73.5±1μs            |    1.03 | import_iris.Iris.time_fileformats_um__ff_replacement                                        |
|          | 77.5±0.3μs           | 78.2±2μs            |    1.01 | import_iris.Iris.time_fileformats_um__optimal_array_structuring                             |
|          | 941±9μs              | 940±5μs             |    1    | import_iris.Iris.time_fileformats_um_cf_map                                                 |
|          | 135±1μs              | 138±2μs             |    1.02 | import_iris.Iris.time_io                                                                    |
|          | 173±2μs              | 172±3μs             |    0.99 | import_iris.Iris.time_io_format_picker                                                      |
|          | 209±2μs              | 209±2μs             |    1    | import_iris.Iris.time_iris                                                                  |
|          | 125±0.7μs            | 126±0.4μs           |    1    | import_iris.Iris.time_iterate                                                               |
|          | 8.02±0.07ms          | 7.99±0.06ms         |    1    | import_iris.Iris.time_palette                                                               |
|          | 1.74±0.02ms          | 1.75±0.01ms         |    1.01 | import_iris.Iris.time_plot                                                                  |
|          | 217±1μs              | 216±1μs             |    1    | import_iris.Iris.time_quickplot                                                             |
|          | 2.09±0.05ms          | 2.13±0.03ms         |    1.02 | import_iris.Iris.time_std_names                                                             |
|          | 1.80±0.01ms          | 1.81±0.01ms         |    1    | import_iris.Iris.time_symbols                                                               |
|          | 261±9ms              | 262±9ms             |    1.01 | import_iris.Iris.time_tests                                                                 |
|          | 249±1μs              | 251±4μs             |    1.01 | import_iris.Iris.time_third_party_cartopy                                                   |
|          | 5.08±0.05ms          | 5.03±0.02ms         |    0.99 | import_iris.Iris.time_third_party_cf_units                                                  |
|          | 118±1μs              | 117±1μs             |    1    | import_iris.Iris.time_third_party_cftime                                                    |
|          | 2.71±0.01ms          | 2.71±0.01ms         |    1    | import_iris.Iris.time_third_party_matplotlib                                                |
|          | 1.30±0ms             | 1.30±0.01ms         |    1    | import_iris.Iris.time_third_party_numpy                                                     |
|          | 168±2μs              | 167±2μs             |    1    | import_iris.Iris.time_third_party_scipy                                                     |
|          | 98.8±0.7μs           | 98.6±0.5μs          |    1    | import_iris.Iris.time_time                                                                  |
|          | 345±8μs              | 347±2μs             |    1    | import_iris.Iris.time_util                                                                  |
|          | 71.9±1μs             | 71.4±0.9μs          |    0.99 | iterate.IZip.time_izip                                                                      |
|          | 9.92±0.03ms          | 10.0±0.06ms         |    1.01 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'FF')                                  |
|          | 16.2±0.8ms           | 16.0±0.2ms          |    0.99 | load.LoadAndRealise.time_load((1280, 960, 5), False, 'NetCDF')                              |
|          | 9.94±0.06ms          | 9.94±0.04ms         |    1    | load.LoadAndRealise.time_load((1280, 960, 5), False, 'PP')                                  |
|          | 9.85±0.04ms          | 9.93±0.05ms         |    1.01 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'FF')                                   |
|          | 13.4±0.2ms           | 13.3±0.1ms          |    0.99 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'NetCDF')                               |
|          | 9.89±0.06ms          | 9.96±0.06ms         |    1.01 | load.LoadAndRealise.time_load((1280, 960, 5), True, 'PP')                                   |
|          | 1.49±0.01s           | 1.48±0.01s          |    0.99 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'FF')                                    |
|          | 12.2±0.1ms           | 12.3±0.1ms          |    1.01 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'NetCDF')                                |
|          | 1.52±0.01s           | 1.51±0.01s          |    0.99 | load.LoadAndRealise.time_load((2, 2, 1000), False, 'PP')                                    |
|          | 1.51±0.01s           | 1.49±0.01s          |    0.99 | load.LoadAndRealise.time_load((2, 2, 1000), True, 'FF')                                     |
|          | 12.2±0.08ms          | 12.1±0.1ms          |    1    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'NetCDF')                                 |
|          | 1.51±0s              | 1.51±0.01s          |    1    | load.LoadAndRealise.time_load((2, 2, 1000), True, 'PP')                                     |
|          | 5.26±0.02ms          | 5.32±0.03ms         |    1.01 | load.LoadAndRealise.time_load((50, 50, 2), False, 'FF')                                     |
|          | 12.0±0.07ms          | 11.9±0.09ms         |    0.99 | load.LoadAndRealise.time_load((50, 50, 2), False, 'NetCDF')                                 |
|          | 5.25±0.02ms          | 5.33±0.04ms         |    1.01 | load.LoadAndRealise.time_load((50, 50, 2), False, 'PP')                                     |
|          | 5.32±0.04ms          | 5.27±0.02ms         |    0.99 | load.LoadAndRealise.time_load((50, 50, 2), True, 'FF')                                      |
|          | 12.0±0.1ms           | 12.0±0.08ms         |    1    | load.LoadAndRealise.time_load((50, 50, 2), True, 'NetCDF')                                  |
|          | 5.26±0.08ms          | 5.42±0.1ms          |    1.03 | load.LoadAndRealise.time_load((50, 50, 2), True, 'PP')                                      |
|          | 22.8±2ms             | 22.9±1ms            |    1.01 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'FF')                               |
|          | 23.6±0.5ms           | 23.9±0.5ms          |    1.01 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'NetCDF')                           |
|          | 12.1±1ms             | 11.3±1ms            |    0.93 | load.LoadAndRealise.time_realise((1280, 960, 5), False, 'PP')                               |
|          | 28.4±1ms             | 28.5±1ms            |    1    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'FF')                                |
|          | 83.1±0.8ms           | 83.0±0.5ms          |    1    | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'NetCDF')                            |
|          | 28.0±1ms             | 27.8±1ms            |    0.99 | load.LoadAndRealise.time_realise((1280, 960, 5), True, 'PP')                                |
|          | 598±2ms              | 603±4ms             |    1.01 | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'FF')                                 |
|          | 3.27±0.07ms          | 3.38±0.09ms         |    1.03 | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'NetCDF')                             |
|          | 602±3ms              | 603±3ms             |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), False, 'PP')                                 |
|          | 608±2ms              | 611±2ms             |    1    | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'FF')                                  |
|          | 3.34±0.08ms          | 3.48±0.1ms          |    1.04 | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'NetCDF')                              |
|          | 603±2ms              | 610±2ms             |    1.01 | load.LoadAndRealise.time_realise((2, 2, 1000), True, 'PP')                                  |
|          | 2.11±0.03ms          | 2.04±0.04ms         |    0.96 | load.LoadAndRealise.time_realise((50, 50, 2), False, 'FF')                                  |
|          | 3.37±0.1ms           | 3.40±0.09ms         |    1.01 | load.LoadAndRealise.time_realise((50, 50, 2), False, 'NetCDF')                              |
|          | 2.01±0.07ms          | 2.01±0.08ms         |    1    | load.LoadAndRealise.time_realise((50, 50, 2), False, 'PP')                                  |
|          | 2.08±0.07ms          | 2.02±0.03ms         |    0.97 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'FF')                                   |
|          | 3.40±0.1ms           | 3.41±0.1ms          |    1    | load.LoadAndRealise.time_realise((50, 50, 2), True, 'NetCDF')                               |
|          | 2.00±0.06ms          | 2.03±0.07ms         |    1.01 | load.LoadAndRealise.time_realise((50, 50, 2), True, 'PP')                                   |
|          | 337±2ms              | 337±1ms             |    1    | load.ManyCubes.time_many_cube_load                                                          |
|          | 89.4±1ms             | 88.9±1ms            |    0.99 | load.ManyVars.time_many_var_load                                                            |
|          | 9.97±0.02ms          | 10.0±0.04ms         |    1    | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'FF')                            |
|          | 10.0±0.06ms          | 10.1±0.08ms         |    1.01 | load.STASHConstraint.time_stash_constraint((1280, 960, 5), 'PP')                            |
|          | 1.51±0.01s           | 1.51±0.01s          |    1    | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'FF')                              |
|          | 1.52±0.01s           | 1.52±0.01s          |    1    | load.STASHConstraint.time_stash_constraint((2, 2, 1000), 'PP')                              |
|          | 5.33±0.02ms          | 5.35±0.02ms         |    1    | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'FF')                                 |
|          | 5.32±0.06ms          | 5.32±0.03ms         |    1    | load.STASHConstraint.time_stash_constraint((2, 2, 2), 'PP')                                 |
|          | 8.95±0.02ms          | 8.95±0.1ms          |    1    | load.StructuredFF.time_structured_load((1280, 960, 5), False)                               |
|          | 5.58±0.03ms          | 5.59±0.02ms         |    1    | load.StructuredFF.time_structured_load((1280, 960, 5), True)                                |
|          | 1.47±0.01s           | 1.48±0.01s          |    1.01 | load.StructuredFF.time_structured_load((2, 2, 1000), False)                                 |
|          | 415±3ms              | 415±3ms             |    1    | load.StructuredFF.time_structured_load((2, 2, 1000), True)                                  |
|          | 4.36±0.07ms          | 4.39±0.06ms         |    1.01 | load.StructuredFF.time_structured_load((2, 2, 2), False)                                    |
|          | 4.21±0.02ms          | 4.24±0.05ms         |    1.01 | load.StructuredFF.time_structured_load((2, 2, 2), True)                                     |
|          | 163±1ms              | 168±2ms             |    1.03 | load.TimeConstraint.time_time_constraint(20, 'FF')                                          |
|          | 15.1±0.2ms           | 15.4±0.2ms          |    1.02 | load.TimeConstraint.time_time_constraint(20, 'NetCDF')                                      |
|          | 165±0.5ms            | 165±1ms             |    1    | load.TimeConstraint.time_time_constraint(20, 'PP')                                          |
|          | 32.8±0.1ms           | 32.7±0.3ms          |    1    | load.TimeConstraint.time_time_constraint(3, 'FF')                                           |
|          | 14.8±0.1ms           | 15.1±0.1ms          |    1.02 | load.TimeConstraint.time_time_constraint(3, 'NetCDF')                                       |
|          | 32.8±0.2ms           | 32.7±0.6ms          |    1    | load.TimeConstraint.time_time_constraint(3, 'PP')                                           |
|          | 18.9±0.4ms           | 18.2±0.2ms          |    0.96 | load.ugrid.BasicLoading.time_load_file(1)                                                   |
|          | 48.5±0.5ms           | 48.2±0.7ms          |    0.99 | load.ugrid.BasicLoading.time_load_file(200000)                                              |
|          | 8.91±0.1ms           | 8.89±0.2ms          |    1    | load.ugrid.BasicLoading.time_load_mesh(1)                                                   |
|          | 16.8±0.4ms           | 16.5±0.4ms          |    0.98 | load.ugrid.BasicLoading.time_load_mesh(200000)                                              |
|          | 18.6±0.5ms           | 18.9±0.3ms          |    1.02 | load.ugrid.BasicLoadingTime.time_load_file(1)                                               |
|          | 19.2±0.6ms           | 19.0±0.4ms          |    0.99 | load.ugrid.BasicLoadingTime.time_load_file(200000)                                          |
|          | 8.74±0.1ms           | 8.83±0.3ms          |    1.01 | load.ugrid.BasicLoadingTime.time_load_mesh(1)                                               |
|          | 11.5±0.2ms           | 11.5±0.3ms          |    1    | load.ugrid.BasicLoadingTime.time_load_mesh(200000)                                          |
|          | 20.6±0.2ms           | 20.9±0.2ms          |    1.02 | load.ugrid.Callback.time_load_file_callback(1)                                              |
|          | 59.7±0.3ms           | 60.3±0.4ms          |    1.01 | load.ugrid.Callback.time_load_file_callback(200000)                                         |
|          | 20.3±0.5ms           | 20.7±0.3ms          |    1.02 | load.ugrid.CallbackTime.time_load_file_callback(1)                                          |
|          | 22.1±0.2ms           | 22.1±0.4ms          |    1    | load.ugrid.CallbackTime.time_load_file_callback(200000)                                     |
|          | 3.52±0.1ms           | 3.48±0.1ms          |    0.99 | load.ugrid.DataRealisation.time_realise_data(10000)                                         |
|          | 6.63±0.2ms           | 6.40±0.1ms          |    0.96 | load.ugrid.DataRealisation.time_realise_data(200000)                                        |
|          | 39.6±2ms             | 37.0±0.9ms          |    0.93 | load.ugrid.DataRealisationTime.time_realise_data(10000)                                     |
|          | 761±9ms              | 763±5ms             |    1    | load.ugrid.DataRealisationTime.time_realise_data(200000)                                    |
|          | 1.39±0.02s           | 1.37±0.03s          |    0.98 | merge_concat.Concatenate.time_concatenate(False)                                            |
|          | 427±10ms             | 422±7ms             |    0.99 | merge_concat.Concatenate.time_concatenate(True)                                             |
|          | 2.42±0G              | 2.42±0G             |    1    | merge_concat.Concatenate.tracemalloc_concatenate(False)                                     |
|          | 110±2M               | 110±5M              |    1    | merge_concat.Concatenate.tracemalloc_concatenate(True)                                      |
|          | 39.2±3ms             | 39.4±2ms            |    1    | merge_concat.Merge.time_merge                                                               |
|          | 126±0.03M            | 126±0.03M           |    1    | merge_concat.Merge.tracemalloc_merge                                                        |
|          | 366±4ns              | 369±1ns             |    1.01 | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(50)              |
|          | 194±1ms              | 195±1ms             |    1.01 | mesh.utils.regions_combine.CombineRegionsComputeRealData.time_compute_data(500)             |
|          | 771±0.5k             | 771±0.4k            |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(50)       |
|          | 60.2±0M              | 60.2±0M             |    1    | mesh.utils.regions_combine.CombineRegionsComputeRealData.tracemalloc_compute_data(500)      |
|          | 18.4±0.2ms           | 18.9±0.2ms          |    1.03 | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(50)           |
|          | 21.8±0.5ms           | 21.7±0.3ms          |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.time_create_combined_cube(500)          |
|          | 1.27±0.04M           | 1.27±0.04M          |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(50)    |
|          | 25±0.04M             | 25±0.04M            |    1    | mesh.utils.regions_combine.CombineRegionsCreateCube.tracemalloc_create_combined_cube(500)   |
|          | 119±0.7ms            | 118±1ms             |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(50)         |
|          | 577±7ms              | 578±3ms             |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.time_stream_file2file(500)        |
|          | 1.46±0.03M           | 1.48±0.02M          |    1.01 | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(50)  |
|          | 96.5±0.02M           | 96.5±0.03M          |    1    | mesh.utils.regions_combine.CombineRegionsFileStreamedCalc.tracemalloc_stream_file2file(500) |
|          | 78.4±0.7ms           | 77.1±0.5ms          |    0.98 | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(50)                             |
|          | 534±3ms              | 534±2ms             |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.time_save(500)                            |
|          | 1.41±0.04M           | 1.41±0.02M          |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(50)                      |
|          | 96.4±0.03M           | 96.5±0.02M          |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.tracemalloc_save(500)                     |
|          | 2.1752849999999997   | 2.1752849999999997  |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(50)                  |
|          | 216.01528499999998   | 216.01528499999998  |    1    | mesh.utils.regions_combine.CombineRegionsSaveData.track_filesize_saved(500)                 |
|          | 6.67±0.03ms          | 6.84±0.1ms          |    1.03 | plot.AuxSort.time_aux_sort                                                                  |
|          | 79.0±1ms             | 77.1±4ms            |    0.98 | regridding.CurvilinearRegridding.time_regrid_pic                                            |
|          | 136±3M               | 136±3M              |    1    | regridding.CurvilinearRegridding.tracemalloc_regrid_pic                                     |
|          | 105±6ms              | 104±6ms             |    0.99 | regridding.HorizontalChunkedRegridding.time_regrid_area_w                                   |
|          | 62.9±5ms             | 63.3±1ms            |    1.01 | regridding.HorizontalChunkedRegridding.time_regrid_area_w_new_grid                          |
|          | 107±0.08M            | 107±0.09M           |    1    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w                            |
|          | 147±0.04M            | 147±0.04M           |    1    | regridding.HorizontalChunkedRegridding.tracemalloc_regrid_area_w_new_grid                   |
|          | 4.65±0.03ms          | 4.62±0.08ms         |    0.99 | save.NetcdfSave.time_netcdf_save_cube(50, False)                                            |
|          | 83.9±1ms             | 84.3±0.5ms          |    1    | save.NetcdfSave.time_netcdf_save_cube(50, True)                                             |
|          | 41.1±0.5ms           | 41.2±0.3ms          |    1    | save.NetcdfSave.time_netcdf_save_cube(600, False)                                           |
|          | 473±4ms              | 477±3ms             |    1.01 | save.NetcdfSave.time_netcdf_save_cube(600, True)                                            |
|          | 86.3±0.9ns           | 86.4±0.8ns          |    1    | save.NetcdfSave.time_netcdf_save_mesh(50, False)                                            |
|          | 64.0±1ms             | 63.9±0.9ms          |    1    | save.NetcdfSave.time_netcdf_save_mesh(50, True)                                             |
|          | 87.7±0.7ns           | 88.3±1ns            |    1.01 | save.NetcdfSave.time_netcdf_save_mesh(600, False)                                           |
|          | 414±3ms              | 415±3ms             |    1    | save.NetcdfSave.time_netcdf_save_mesh(600, True)                                            |
|          | 31.7±0.3k            | 31.8±0.4k           |    1    | save.NetcdfSave.tracemalloc_netcdf_save(50, False)                                          |
|          | 1.86±0.2M            | 1.9±0.2M            |    1.02 | save.NetcdfSave.tracemalloc_netcdf_save(50, True)                                           |
|          | 31.6±0.3k            | 31.8±0.3k           |    1.01 | save.NetcdfSave.tracemalloc_netcdf_save(600, False)                                         |
|          | 225±20M              | 208±20M             |    0.92 | save.NetcdfSave.tracemalloc_netcdf_save(600, True)                                          |
|          | 38.9±0.2ms           | 38.8±0.4ms          |    1    | stats.PearsonR.time_lazy                                                                    |
|          | 9.33±0.1ms           | 9.26±0.2ms          |    0.99 | stats.PearsonR.time_real                                                                    |
|          | 29.4±0.8M            | 29.4±1M             |    1    | stats.PearsonR.tracemalloc_lazy                                                             |
|          | 18.3±0.01M           | 18.3±0.01M          |    1    | stats.PearsonR.tracemalloc_real                                                             |
|          | 25.1±0.3ms           | 25.2±0.5ms          |    1    | trajectory.TrajectoryInterpolation.time_trajectory_linear                                   |
|          | 61.0±0.5ms           | 61.6±0.3ms          |    1.01 | trajectory.TrajectoryInterpolation.time_trajectory_nearest                                  |
|          | 17.6±0.02M           | 17.6±0.02M          |    1    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_linear                            |
|          | 7.75±0.02M           | 7.75±0.02M          |    1    | trajectory.TrajectoryInterpolation.tracemalloc_trajectory_nearest                           |

Generated by GHA run 16323043207

@pp-mo pp-mo force-pushed the nc_attribute_handlers branch from ad34c83 to dc0c441 Compare July 17, 2025 18:37
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benchmark_this Request that this pull request be benchmarked to check if it introduces performance shifts
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"GRIB_PARAM" attributes are not saving to netcdf
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