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-rw-r--r--lid_driven_cavity/cuda/CMakeLists.txt30
-rw-r--r--lid_driven_cavity/cuda/config.py15
-rwxr-xr-xlid_driven_cavity/cuda/generate.py43
-rw-r--r--lid_driven_cavity/cuda/ldc.cuda.SSS.mako221
4 files changed, 309 insertions, 0 deletions
diff --git a/lid_driven_cavity/cuda/CMakeLists.txt b/lid_driven_cavity/cuda/CMakeLists.txt
new file mode 100644
index 0000000..7c920f2
--- /dev/null
+++ b/lid_driven_cavity/cuda/CMakeLists.txt
@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.10)
+project(ldc LANGUAGES CXX)
+find_package(CUDA QUIET REQUIRED)
+
+if(NOT CMAKE_BUILD_TYPE)
+ set(CMAKE_BUILD_TYPE Release)
+endif()
+
+add_custom_command(
+ OUTPUT
+ kernel.h
+ ldc.cu
+ COMMAND
+ ${CMAKE_CURRENT_SOURCE_DIR}/generate.py --output ${CMAKE_CURRENT_BINARY_DIR}
+ WORKING_DIRECTORY
+ ${CMAKE_CURRENT_SOURCE_DIR}
+ DEPENDS
+ generate.py
+ config.py
+ ldc.cuda.SSS.mako
+)
+
+include_directories(
+ ${CMAKE_BINARY_DIR}
+)
+
+cuda_add_executable(
+ ldc
+ ${CMAKE_CURRENT_BINARY_DIR}/ldc.cu
+)
diff --git a/lid_driven_cavity/cuda/config.py b/lid_driven_cavity/cuda/config.py
new file mode 100644
index 0000000..27000e3
--- /dev/null
+++ b/lid_driven_cavity/cuda/config.py
@@ -0,0 +1,15 @@
+from boltzgen.lbm.lattice import *
+from boltzgen import Geometry
+
+descriptor = D2Q9
+geometry = Geometry(512, 512)
+tau = 0.52
+precision = 'single'
+streaming = 'SSS'
+
+## 3D LDC
+#descriptor = D3Q19
+#geometry = Geometry(64, 64, 64)
+#tau = 0.6
+#precision = 'single'
+#streaming = 'SSS'
diff --git a/lid_driven_cavity/cuda/generate.py b/lid_driven_cavity/cuda/generate.py
new file mode 100755
index 0000000..27ce511
--- /dev/null
+++ b/lid_driven_cavity/cuda/generate.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+import argparse
+
+from boltzgen import Generator, Geometry
+from boltzgen.lbm.model import BGK
+
+import config
+
+argparser = argparse.ArgumentParser(
+ description = 'Generate a CUDA implementation of a lid driven cavity simulation using LBM')
+argparser.add_argument(
+ '--output', required = False, help = 'Target directory for the generated sources')
+
+args = argparser.parse_args()
+
+generator = Generator(
+ model = BGK(config.descriptor, tau = config.tau),
+ target = 'cuda',
+ precision = config.precision,
+ streaming = config.streaming,
+ index = 'XYZ',
+ layout = 'SOA')
+
+if args.output is None:
+ args.output = '.'
+
+functions = ['collide_and_stream', 'equilibrilize', 'collect_moments', 'momenta_boundary']
+
+if config.streaming == 'SSS':
+ functions += ['update_sss_control_structure']
+
+extras = ['cell_list_dispatch']
+
+with open('%s/kernel.h' % args.output, 'w') as kernel:
+ kernel.write(generator.kernel(config.geometry, functions, extras))
+
+ldc_src = ''
+with open('ldc.cuda.%s.mako' % config.streaming, 'r') as template:
+ ldc_src = template.read()
+
+with open('%s/ldc.cu' % args.output, 'w') as app:
+ app.write(generator.custom(config.geometry, ldc_src))
diff --git a/lid_driven_cavity/cuda/ldc.cuda.SSS.mako b/lid_driven_cavity/cuda/ldc.cuda.SSS.mako
new file mode 100644
index 0000000..2a4aed0
--- /dev/null
+++ b/lid_driven_cavity/cuda/ldc.cuda.SSS.mako
@@ -0,0 +1,221 @@
+#include <cstdint>
+#include <memory>
+#include <vector>
+#include <chrono>
+#include <iostream>
+#include <fstream>
+
+#include "kernel.h"
+
+void write_moments_to_vtk(const std::string& path, ${float_type}* u) {
+ std::ofstream fout;
+ fout.open(path.c_str());
+
+ fout << "# vtk DataFile Version 3.0\n";
+ fout << "lbm_output\n";
+ fout << "ASCII\n";
+ fout << "DATASET RECTILINEAR_GRID\n";
+% if descriptor.d == 2:
+ fout << "DIMENSIONS " << ${geometry.size_x-2} << " " << ${geometry.size_y-2} << " 1" << "\n";
+% else:
+ fout << "DIMENSIONS " << ${geometry.size_x-2} << " " << ${geometry.size_y-2} << " " << ${geometry.size_z-2} << "\n";
+% endif
+
+ fout << "X_COORDINATES " << ${geometry.size_x-2} << " float\n";
+ for( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ fout << x << " ";
+ }
+
+ fout << "\nY_COORDINATES " << ${geometry.size_y-2} << " float\n";
+ for( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ fout << y << " ";
+ }
+
+% if descriptor.d == 2:
+ fout << "\nZ_COORDINATES " << 1 << " float\n";
+ fout << 0 << "\n";
+ fout << "POINT_DATA " << ${(geometry.size_x-2) * (geometry.size_y-2)} << "\n";
+% else:
+ fout << "\nZ_COORDINATES " << ${geometry.size_z-2} << " float\n";
+ for( std::size_t z = 1; z < ${geometry.size_z-1}; ++z ) {
+ fout << z << " ";
+ }
+ fout << "\nPOINT_DATA " << ${(geometry.size_x-2) * (geometry.size_y-2) * (geometry.size_z-2)} << "\n";
+% endif
+
+ fout << "VECTORS velocity float\n";
+% if descriptor.d == 2:
+ for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ const std::size_t gid = x*${geometry.size_y}+y;
+ fout << u[gid*${descriptor.d}+0] << " " << u[gid*${descriptor.d}+1] << " 0\n";
+ }
+ }
+% else:
+ for ( std::size_t z = 1; z < ${geometry.size_z-1}; ++z ) {
+ for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
+ for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
+ const std::size_t gid = x*${geometry.size_y*geometry.size_z}+y*${geometry.size_z}+z;
+ fout << u[gid*${descriptor.d}+0] << " " << u[gid*${descriptor.d}+1] << " " << u[gid*${descriptor.d}+2] << "\n";
+ }
+ }
+ }
+% endif
+
+ fout.close();
+}
+
+void simulate(std::size_t nStep)
+{
+<%
+ padding = (max(geometry.size_x,geometry.size_y,geometry.size_z)+1)**(descriptor.d-1)
+%>
+ ${float_type}* f_aa;
+ cudaMalloc(&f_aa, ${(geometry.volume+2*padding)*descriptor.q}*sizeof(${float_type}));
+
+ ${float_type}** f;
+ cudaMalloc(&f, ${descriptor.q}*sizeof(${float_type}*));
+
+ ${float_type}* device_moments_rho;
+ cudaMalloc(&device_moments_rho, ${geometry.volume} * sizeof(${float_type}));
+ ${float_type}* device_moments_u;
+ cudaMalloc(&device_moments_u, ${geometry.volume*descriptor.d} * sizeof(${float_type}));
+ std::vector<${float_type}> moments_u(${geometry.volume*descriptor.d});
+
+ init_sss_control_structure<<<1,1>>>(f_aa, f);
+ cudaDeviceSynchronize();
+
+ std::vector<std::size_t> ghost;
+ std::vector<std::size_t> bulk;
+ std::vector<std::size_t> lid_bc;
+ std::vector<std::size_t> box_bc;
+
+ for (int iX = 0; iX < ${geometry.size_x}; ++iX) {
+ for (int iY = 0; iY < ${geometry.size_y}; ++iY) {
+% if descriptor.d == 2:
+ const std::size_t iCell = iX*${geometry.size_y} + iY;
+ if (iX == 0 || iY == 0 || iX == ${geometry.size_x-1} || iY == ${geometry.size_y-1}) {
+ ghost.emplace_back(iCell);
+ } else if (iY == ${geometry.size_y-2}) {
+ lid_bc.emplace_back(iCell);
+ } else if (iX == 1 || iX == ${geometry.size_x-2} || iY == 1) {
+ box_bc.emplace_back(iCell);
+ } else {
+ bulk.emplace_back(iCell);
+ }
+% elif descriptor.d == 3:
+ for (int iZ = 0; iZ < ${geometry.size_z}; ++iZ) {
+ const std::size_t iCell = iX*${geometry.size_y*geometry.size_z} + iY*${geometry.size_z} + iZ;
+ if ( iX == 0 || iY == 0 || iZ == 0
+ || iX == ${geometry.size_x-1}
+ || iY == ${geometry.size_y-1}
+ || iZ == ${geometry.size_z-1}) {
+ ghost.emplace_back(iCell);
+ } else if (iZ == ${geometry.size_z-2}) {
+ lid_bc.emplace_back(iCell);
+ } else if ( iX == 1 || iX == ${geometry.size_x-2}
+ || iY == 1 || iY == ${geometry.size_y-2}
+ || iZ == 1) {
+ box_bc.emplace_back(iCell);
+ } else {
+ bulk.emplace_back(iCell);
+ }
+ }
+% endif
+ }
+ }
+
+ std::cout << "#ghost : " << ghost.size() << std::endl;
+ std::cout << "#bulk : " << bulk.size() << std::endl;
+ std::cout << "#lid : " << lid_bc.size() << std::endl;
+ std::cout << "#wall : " << box_bc.size() << std::endl;
+ std::cout << std::endl;
+
+ std::size_t* device_ghost_cells;
+ std::size_t* device_bulk_cells;
+ std::size_t* device_lid_bc_cells;
+ std::size_t* device_box_bc_cells;
+
+ cudaMalloc(&device_ghost_cells, ghost.size() * sizeof(std::size_t));
+ cudaMalloc(&device_bulk_cells, bulk.size() * sizeof(std::size_t));
+ cudaMalloc(&device_lid_bc_cells, lid_bc.size() * sizeof(std::size_t));
+ cudaMalloc(&device_box_bc_cells, box_bc.size() * sizeof(std::size_t));
+
+ cudaMemcpy(device_ghost_cells, ghost.data(), ghost.size() * sizeof(std::size_t), cudaMemcpyHostToDevice);
+ cudaMemcpy(device_bulk_cells, bulk.data(), bulk.size() * sizeof(std::size_t), cudaMemcpyHostToDevice);
+ cudaMemcpy(device_lid_bc_cells, lid_bc.data(), lid_bc.size()* sizeof(std::size_t), cudaMemcpyHostToDevice);
+ cudaMemcpy(device_box_bc_cells, box_bc.data(), box_bc.size()* sizeof(std::size_t), cudaMemcpyHostToDevice);
+
+ cudaDeviceSynchronize();
+
+ const std::size_t block_size = 32;
+ std::size_t block_count = 0;
+
+ block_count = (ghost.size() + block_size - 1) / block_size;
+ equilibrilize<<<block_count,block_size>>>(f, device_ghost_cells, ghost.size());
+
+ block_count = (bulk.size() + block_size - 1) / block_size;
+ equilibrilize<<<block_count,block_size>>>(f, device_bulk_cells, bulk.size());
+
+ block_count = (box_bc.size() + block_size - 1) / block_size;
+ equilibrilize<<<block_count,block_size>>>(f, device_box_bc_cells, box_bc.size());
+
+ block_count = (lid_bc.size() + block_size - 1) / block_size;
+ equilibrilize<<<block_count,block_size>>>(f, device_lid_bc_cells, lid_bc.size());
+
+ cudaDeviceSynchronize();
+
+ auto start = std::chrono::high_resolution_clock::now();
+
+ for (std::size_t iStep = 1; iStep <= nStep; ++iStep) {
+ block_count = (ghost.size() + block_size - 1) / block_size;
+ equilibrilize<<<block_count,block_size>>>(f, device_ghost_cells, ghost.size());
+
+ block_count = (bulk.size() + block_size - 1) / block_size;
+ collide_and_stream<<<block_count,block_size>>>(f, device_bulk_cells, bulk.size());
+
+ block_count = (box_bc.size() + block_size - 1) / block_size;
+% if descriptor.d == 2:
+ velocity_momenta_boundary<<<block_count,block_size>>>(f, device_box_bc_cells, box_bc.size(), 0.0, 0.0);
+% else:
+ velocity_momenta_boundary<<<block_count,block_size>>>(f, device_box_bc_cells, box_bc.size(), 0.0, 0.0, 0.0);
+% endif
+
+ block_count = (lid_bc.size() + block_size - 1) / block_size;
+% if descriptor.d == 2:
+ velocity_momenta_boundary<<<block_count,block_size>>>(f, device_lid_bc_cells, lid_bc.size(), 0.05, 0.0);
+% else:
+ velocity_momenta_boundary<<<block_count,block_size>>>(f, device_lid_bc_cells, lid_bc.size(), 0.05, 0.0, 0.0);
+% endif
+
+ cudaDeviceSynchronize();
+ update_sss_control_structure<<<1,1>>>(f);
+ cudaDeviceSynchronize();
+
+ if (iStep % 1000 == 0) {
+ auto duration = std::chrono::duration_cast<std::chrono::duration<float>>(
+ std::chrono::high_resolution_clock::now() - start);
+ std::cout << "iStep = " << iStep << "; ~" << 1000*${geometry.volume}/(1e6*duration.count()) << " MLUPS" << std::endl;
+
+ block_count = (bulk.size() + block_size - 1) / block_size;
+ collect_moments<<<block_count,block_size>>>(f, device_bulk_cells, bulk.size(), device_moments_rho, device_moments_u);
+ cudaMemcpy(moments_u.data(), device_moments_u, ${geometry.volume*descriptor.d}*sizeof(${float_type}), cudaMemcpyDeviceToHost);
+ write_moments_to_vtk("result/ldc_" + std::to_string(iStep) + ".vtk", moments_u.data());
+
+ start = std::chrono::high_resolution_clock::now();
+ }
+ }
+
+ cudaFree(device_ghost_cells);
+ cudaFree(device_bulk_cells);
+ cudaFree(device_lid_bc_cells);
+ cudaFree(device_box_bc_cells);
+ cudaFree(device_moments_rho);
+ cudaFree(device_moments_u);
+ cudaFree(f);
+ cudaFree(f_aa);
+}
+
+int main() {
+ simulate(20000);
+}