55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
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#include "universe.h"
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#include <tbb/task_scheduler_init.h>
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#include <tbb/flow_graph.h>
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#include <tbb/partitioner.h>
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#include <tbb/blocked_range.h>
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#include <tbb/parallel_for.h>
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struct UpdateStressBody {
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Universe & u_;
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UpdateStressBody(Universe & u):u_(u){}
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void operator()( const tbb::blocked_range<int>& range ) const {
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u_.UpdateStress(Universe::Rectangle(0, range.begin(), u_.UniverseWidth-1, range.size()));
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}
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};
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struct UpdateVelocityBody {
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Universe & u_;
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UpdateVelocityBody(Universe & u):u_(u){}
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void operator()( const tbb::blocked_range<int>& y_range ) const {
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u_.UpdateVelocity(Universe::Rectangle(1, y_range.begin(), u_.UniverseWidth-1, y_range.size()));
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}
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};
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// the wavefront computation
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void seismic_tbb(unsigned num_threads, unsigned num_frames, Universe& u) {
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using namespace tbb;
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using namespace tbb::flow;
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tbb::task_scheduler_init init(num_threads);
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static tbb::affinity_partitioner affinity;
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for(unsigned i=0u; i<num_frames; ++i ) {
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u.UpdatePulse();
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tbb::parallel_for(tbb::blocked_range<int>( 0, u.UniverseHeight-1 ), // Index space for loop
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UpdateStressBody(u), // Body of loop
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affinity); // Affinity hint
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tbb::parallel_for(tbb::blocked_range<int>( 1, u.UniverseHeight ), // Index space for loop
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UpdateVelocityBody(u), // Body of loop
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affinity); // Affinity hint
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}
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}
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std::chrono::microseconds measure_time_tbb(unsigned num_threads, unsigned num_frames, Universe& u) {
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auto beg = std::chrono::high_resolution_clock::now();
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seismic_tbb(num_threads, num_frames, u);
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auto end = std::chrono::high_resolution_clock::now();
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return std::chrono::duration_cast<std::chrono::microseconds>(end - beg);
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}
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