Add OpenACC collapse clause to a nested loop

What is the new feature

Improve minval_2d performance.

How is it implemented

Add COLLAPSE(2) to a nested loop in minval_2d to improve performance.

Mandatory steps before review

• Gitlab CI passes (Hint: use make format for linting)
• New feature is covered by additional unit tests
• Mark the merge request as ready by removing Draft:

Mandatory steps before merge

• Test coverage does not decrease
• Reviewed by a maintainer
• Incorporate review suggestions
• Prior to merging, please remove any boilerplate from the MR description, retaining only the Please describe your feature in a couple of words and describe important implementation details of the feature section to maintain
• Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)

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approved this merge request

Hi @b382258, Is this the MR related to the LUMI performance? Can you apply our MR template for the description? I will try to merge it today.

changed the description

resolved all threads

marked the checklist item Gitlab CI passes (Hint: use make format for linting) as completed

marked the checklist item New feature is covered by additional unit tests as completed

marked the checklist item Mark the merge request as ready by removing Draft: as completed

marked the checklist item Test coverage does not decrease as completed

marked the checklist item Reviewed by a maintainer as completed

merged

mentioned in commit 2cdb6a96

assigned to @b382258

requested review from @b382190