Mixed execution spaces

The IPPL types now forward variadic parameters to their internal views, allowing the user to choose the behavior of each component. It is also possible for users to disable particle IDs if these are not needed for the application.

This MR also makes IPPL dependent on C++20, so compilation for Gwendolen will not be possible after merging unless the machine is updated. The CMakeLists is updated to reflect this. Warnings about host functions are also suppressed for debug builds to remove warnings about assertions in device functions.

Some of the indicated changes are just formatting changes. These are also present in !176 (merged). Once this is merged, the number of changes reported for this MR should also decrease.

The Landau damping mini-app is updated to use standard library threading to achieve concurrent execution on CPUs and GPUs (data logging occurs on CPUs in parallel to GPU timestepping; requires an additional command line argument). Timer fences are controlled via command line parameter and are disabled by default if multiple accelerators are present in the build.

Closes #175 (closed).

added Enhancement Feature request labels

@vinciguerra_a Looks good in general, but there are a few helper functions that would benefit from some documentation.

added 2 commits

• 763ec5e7 - Use Kokkos math in kernel
• 9c1a1db3 - Add docstrings for type utilities

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added 2 commits

• 82f55ae8 - Remove fence for particle BCs
• 00cdca15 - Log Landau data at intervals

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added 2 commits

• 0848d059 - Scale timestep by logging period
• a282b4a2 - Rename logging period variable

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added 3 commits

• 45f6cce9 - Control timer fences at runtime
• e23862ea - Warn if timer fences not set
• a610025d - Can enable or disable timers

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marked this merge request as ready

changed the description

added 1 commit

• 24a2b8e3 - Fix logging period for other ALPINE apps

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added 1 commit

• 3c0a8800 - Use active enable for particle IDs

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added 3 commits

• d32bd3f4 - Check particle conservation every time step
• f4ed8343 - Add overload for Landau without mixed exec
• dcf36b65 - Create separate program for mixed exec Landau

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resolved all threads

approved this merge request

merged

mentioned in commit ffa9e9cc

mentioned in merge request !195 (merged)

mentioned in issue #189