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Align capacity to 256 bytes in ParticleTileRT #5335

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Align capacity to 256 bytes in ParticleTileRT #5335

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16 changes: 14 additions & 2 deletions Src/Particle/AMReX_ParticleTileRT.H
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Original file line number Diff line number Diff line change
Expand Up @@ -639,6 +639,7 @@ struct ParticleTileRT
if (m_capacity < new_size) {
size_type new_grown_capacity =
grow_podvector_capacity(strategy, new_size, m_capacity, sizeof(RType));
new_grown_capacity = align_capacity(new_grown_capacity);
realloc_and_move(new_size, new_grown_capacity, m_n_real, m_n_int);
} else {
m_size = new_size;
Expand All @@ -652,6 +653,7 @@ struct ParticleTileRT
if (m_capacity < new_capacity) {
size_type new_grown_capacity =
grow_podvector_capacity(strategy, new_capacity, m_capacity, sizeof(RType));
new_grown_capacity = align_capacity(new_grown_capacity);
realloc_and_move(m_size, new_grown_capacity, m_n_real, m_n_int);
}
}
Expand Down Expand Up @@ -737,8 +739,9 @@ struct ParticleTileRT
{
AMREX_ALWAYS_ASSERT(m_defined);

if (m_size != m_capacity) {
realloc_and_move(m_size, m_size, m_n_real, m_n_int);
size_type aligned_size = align_capacity(m_size);
if (aligned_size < m_capacity) {
realloc_and_move(m_size, aligned_size, m_n_real, m_n_int);
}
}

Expand Down Expand Up @@ -805,6 +808,15 @@ private:
return static_cast<int>(std::distance(name_list->begin(), pos));
}

static size_type align_capacity (size_type capacity) {
const auto aligment_in_bytes = Arena::align_size;
const auto aligment_in_elements = aligment_in_bytes / std::gcd(
std::gcd(aligment_in_bytes, sizeof(uint64_t)),
std::gcd(sizeof(RType), sizeof(IType))
);
return (capacity + aligment_in_elements - 1) / aligment_in_elements * aligment_in_elements;
}

bool m_defined = false;

Arena* m_arena = nullptr;
Expand Down
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