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Substitute custom prefix scan with standard implementations #221

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sbaldu wants to merge 3 commits into from
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Substitute custom prefix scan with standard implementations #221

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dbd7909
Substitute custom prefix scan with standard implementations
sbaldu Oct 18, 2025
23b4708
Use new prefix scan for filling associators
sbaldu Oct 18, 2025
07bee6c
Add synchronization
sbaldu Oct 21, 2025
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44 changes: 6 additions & 38 deletions include/CLUEstering/data_structures/detail/AssociationMap.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -304,27 +304,11 @@ namespace clue {
bin_buffer.data(),
sizes_buffer.data(),
size);

auto block_counter = make_device_buffer<int32_t>(queue);
alpaka::memset(queue, block_counter, 0);
alpaka::wait(queue);

auto temp_offsets = make_device_buffer<int32_t[]>(queue, m_nbins + 1);
alpaka::memset(queue, temp_offsets, 0u, 1u);
const auto blocksize_multiblockscan = 1024;
auto gridsize_multiblockscan = divide_up_by(m_nbins, blocksize_multiblockscan);
const auto workdiv_multiblockscan =
make_workdiv<TAcc>(gridsize_multiblockscan, blocksize_multiblockscan);
const auto dev = alpaka::getDev(queue);
auto warp_size = alpaka::getPreferredWarpSize(dev);
alpaka::exec<TAcc>(queue,
workdiv_multiblockscan,
multiBlockPrefixScan<int32_t>{},
sizes_buffer.data(),
temp_offsets.data() + 1,
m_nbins,
gridsize_multiblockscan,
block_counter.data(),
warp_size);
internal::algorithm::inclusive_scan(
sizes_buffer.data(), sizes_buffer.data() + m_nbins, temp_offsets.data() + 1);

alpaka::memcpy(queue,
make_device_view(alpaka::getDev(queue), m_offsets.data(), m_nbins + 1),
Expand Down Expand Up @@ -381,27 +365,11 @@ namespace clue {
associations.data(),
sizes_buffer.data(),
size);

auto block_counter = make_device_buffer<int32_t>(queue);
alpaka::memset(queue, block_counter, 0);
alpaka::wait(queue);

auto temp_offsets = make_device_buffer<key_type[]>(queue, m_nbins + 1);
alpaka::memset(queue, temp_offsets, 0u, 1u);
const auto blocksize_multiblockscan = 1024;
auto gridsize_multiblockscan = divide_up_by(m_nbins, blocksize_multiblockscan);
const auto workdiv_multiblockscan =
make_workdiv<TAcc>(gridsize_multiblockscan, blocksize_multiblockscan);
const auto dev = alpaka::getDev(queue);
auto warp_size = alpaka::getPreferredWarpSize(dev);
alpaka::exec<TAcc>(queue,
workdiv_multiblockscan,
multiBlockPrefixScan<key_type>{},
sizes_buffer.data(),
temp_offsets.data() + 1,
m_nbins,
gridsize_multiblockscan,
block_counter.data(),
warp_size);
internal::algorithm::inclusive_scan(
sizes_buffer.data(), sizes_buffer.data() + m_nbins, temp_offsets.data() + 1);

alpaka::memcpy(queue,
make_device_view(alpaka::getDev(queue), m_offsets.data(), m_nbins + 1),
Expand Down
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