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Use double buffering in particle storage #266

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merged 3 commits into from
Nov 6, 2023
Merged

Use double buffering in particle storage #266

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872ea81
Use double buffering in particle storage
hidmic Nov 5, 2023
2813781
Add regression test
hidmic Nov 5, 2023
db5eb79
Merge branch 'main' into hidmic/particle-double-buffering
hidmic Nov 6, 2023
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23 changes: 12 additions & 11 deletions beluga/include/beluga/storage.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -179,10 +179,11 @@ class StoragePolicy : public Mixin {
void initialize_particles(Range&& input) {
static_assert(std::is_same_v<particle_type, ranges::range_value_t<Range>>, "Invalid value type");
const std::size_t size = this->self().max_samples();
particles_.resize(size);
const auto first = std::begin(views::all(particles_));
particles_[1].resize(size);
const auto first = std::begin(views::all(particles_[1]));
const auto last = ranges::copy(input | ranges::views::take(size), first).out;
particles_.resize(static_cast<std::size_t>(std::distance(first, last)));
particles_[1].resize(static_cast<std::size_t>(std::distance(first, last)));
std::swap(particles_[0], particles_[1]);
}

/// \copydoc StorageInterface::initialize_states()
Expand All @@ -191,7 +192,7 @@ class StoragePolicy : public Mixin {
}

/// \copydoc StorageInterface::particle_count()
[[nodiscard]] std::size_t particle_count() const final { return particles_.size(); }
[[nodiscard]] std::size_t particle_count() const final { return particles_[0].size(); }

/// \copydoc StorageInterface::states_view()
[[nodiscard]] output_view_type states_view() const final { return this->states(); }
Expand All @@ -200,22 +201,22 @@ class StoragePolicy : public Mixin {
[[nodiscard]] weights_view_type weights_view() const final { return this->weights(); }

/// Returns a view of the particles container.
[[nodiscard]] auto particles() { return views::all(particles_); }
[[nodiscard]] auto particles() { return views::all(particles_[0]); }
/// Returns a const view of the particles container.
[[nodiscard]] auto particles() const { return views::all(particles_) | ranges::views::const_; }
[[nodiscard]] auto particles() const { return views::all(particles_[0]) | ranges::views::const_; }

/// Returns a view of the particles states.
[[nodiscard]] auto states() { return views::states(particles_); }
[[nodiscard]] auto states() { return views::states(particles_[0]); }
/// Returns a const view of the particles states.
[[nodiscard]] auto states() const { return views::states(particles_) | ranges::views::const_; }
[[nodiscard]] auto states() const { return views::states(particles_[0]) | ranges::views::const_; }

/// Returns a view of the particles weight.
[[nodiscard]] auto weights() { return views::weights(particles_); }
[[nodiscard]] auto weights() { return views::weights(particles_[0]); }
/// Returns a const view of the particles weight.
[[nodiscard]] auto weights() const { return views::weights(particles_) | ranges::views::const_; }
[[nodiscard]] auto weights() const { return views::weights(particles_[0]) | ranges::views::const_; }

private:
Container particles_;
Container particles_[2];
};

/// A storage policy that implements a structure of arrays layout.
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