[Draft] Reduce Particles: Speedup #1104
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Introduce methods to control which parameters (moments, min/max, covariances, etc.) to reduce in particle reduced beam characteristics/moments. Speed up usage, to avoid that recording the history of beam moments can dominate simple simulation runs.
ax3l
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5 tasks
WeiqunZhang
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to AMReX-Codes/amrex
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Aug 19, 2025
## Summary
In C++ it is not allowed to make a zero-sized array type like `int[0]`
so a more verbose way using `amrex::TypeArray<int, 0>` needs to be used.
Additionally, `std::declval` is now used instead of `Types{}`.
## Additional background
Zero-variants in BLAST-ImpactX/impactx#1104
## Checklist
The proposed changes:
- [x] fix a bug or incorrect behavior in AMReX
- [ ] add new capabilities to AMReX
- [ ] changes answers in the test suite to more than roundoff level
- [ ] are likely to significantly affect the results of downstream AMReX
users
- [ ] include documentation in the code and/or rst files, if appropriate
Observed: - too explicit - split min/max out separately, seldomly needed - make the other options "stack"
WeiqunZhang
added a commit
to AMReX-Codes/amrex
that referenced
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Sep 11, 2025
## Summary Sometimes one needs the underlying (u)int value of an `enum class`, e.g., when building bitmasks. This adds a helper function to `AMREX_ENUM`. ## Additional background BLAST-ImpactX/impactx#1104 --------- Co-authored-by: Weiqun Zhang <[email protected]>
ax3l
commented
Sep 11, 2025
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| constexpr MomentSelection operator| (MomentSelection lhs, MomentSelection rhs) noexcept | ||
| { | ||
| return static_cast<MomentSelection>(static_cast<std::underlying_type_t<MomentSelection>>(lhs) | static_cast<std::underlying_type_t<MomentSelection>>(rhs)); |
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Introduce methods to control which parameters (moments, min/max, covariances, etc.) to reduce in particle reduced beam characteristics/moments. Speed up usage, to avoid that recording the history of beam moments can dominate simple simulation runs.
Fix #1102
To Do