GPU and constant weight finite differences

Description

For constant weight finite differences, the weights are stored on the GPU once and not copied every application of the operator.

News snippet

Improved GPU performances

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.

changed milestone to %13.0

added GPU Optimization labels

requested review from @sohlmann

resolved all threads

The GPU tests seem to fail...

added 120 commits

• 4d2befd8...3c842c86 - 119 commits from branch main
• 20026544 - For constant weight finite differences, the weights are stored on the GPU once...

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added 2 commits

• d6185d3d - Fix the missing copy of the GU buffers for the nonlocal operator.
• 45b651d4 - Update the GPU buffer for the nl operators when modified.

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added 1 commit

• 2116f626 - Update the GPU buffer for the nl operators when modified.

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added 93 commits

• 2116f626...6196a45d - 90 commits from branch main
• 686416ef - For constant weight finite differences, the weights are stored on the GPU once...
• 602b1857 - Fix the missing copy of the GU buffers for the nonlocal operator.
• a523d858 - Update the GPU buffer for the nl operators when modified.

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added 8 commits

• a523d858...205812ce - 5 commits from branch main
• 9d3745fa - For constant weight finite differences, the weights are stored on the GPU once...
• bf41391e - Fix the missing copy of the GU buffers for the nonlocal operator.
• 1160ed25 - Update the GPU buffer for the nl operators when modified.

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resolved all threads

@sohlmann This seems to be ready for been merged. Would you mind reviewing it again?

added 49 commits

• 1160ed25...c2353193 - 46 commits from branch main
• 3aa95ca6 - For constant weight finite differences, the weights are stored on the GPU once...
• 03ccfbec - Fix the missing copy of the GU buffers for the nonlocal operator.
• 82d67062 - Update the GPU buffer for the nl operators when modified.

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resolved all threads

approved this merge request

enabled an automatic merge when the pipeline for 82d67062 succeeds

assigned to @nicolastd

merged