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authorAdrian Kummerlaender2019-10-30 19:45:39 +0100
committerAdrian Kummerlaender2019-10-30 19:45:39 +0100
commitd540b701836dbcdef727947f52a0ca01430968a6 (patch)
treedc193069a4213d1b2c0778380bbf5d2fa63dec70 /ldc_2d/cpp
parentfc58dab96f27624435a1c08480234a7c03071e27 (diff)
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Rename folder, add basic README.md
Diffstat (limited to 'ldc_2d/cpp')
-rw-r--r--ldc_2d/cpp/CMakeLists.txt44
-rw-r--r--ldc_2d/cpp/README.md18
-rw-r--r--ldc_2d/cpp/config.py13
-rwxr-xr-xldc_2d/cpp/generate.py40
-rw-r--r--ldc_2d/cpp/ldc.cpp.mako176
5 files changed, 0 insertions, 291 deletions
diff --git a/ldc_2d/cpp/CMakeLists.txt b/ldc_2d/cpp/CMakeLists.txt
deleted file mode 100644
index 5b5fb90..0000000
--- a/ldc_2d/cpp/CMakeLists.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-cmake_minimum_required(VERSION 3.10)
-project(ldc LANGUAGES CXX)
-
-if(NOT CMAKE_BUILD_TYPE)
- set(CMAKE_BUILD_TYPE Release)
-endif()
-
-set(CMAKE_CXX_FLAGS_RELEASE "-O3")
-
-add_custom_command(
- OUTPUT
- kernel.h
- ldc.cpp
- COMMAND
- ${CMAKE_CURRENT_SOURCE_DIR}/generate.py --output ${CMAKE_CURRENT_BINARY_DIR}
- WORKING_DIRECTORY
- ${CMAKE_CURRENT_SOURCE_DIR}
- DEPENDS
- generate.py config.py ldc.cpp.mako
-)
-
-include_directories(
- ${CMAKE_BINARY_DIR}
-)
-
-add_executable(
- ldc
- ${CMAKE_CURRENT_BINARY_DIR}/ldc.cpp
-)
-
-target_compile_features(
- ldc
- PUBLIC
- cxx_std_17
-)
-
-find_package(OpenMP)
-if(OpenMP_CXX_FOUND)
- target_link_libraries(
- ldc
- PUBLIC
- OpenMP::OpenMP_CXX
- )
-endif()
diff --git a/ldc_2d/cpp/README.md b/ldc_2d/cpp/README.md
deleted file mode 100644
index 8e84c83..0000000
--- a/ldc_2d/cpp/README.md
+++ /dev/null
@@ -1,18 +0,0 @@
-# Lid driven cavity
-
-This example models the common lid driven cavity example.
-Note that the actual optimized C++ implementation is generated using the _boltzgen_ library.
-
-See `config.py` for various configuration options. Both 2D and 3D are supported.
-
-## Build instructions
-
-```
-mkdir build
-cd build
-cmake ..
-make
-./ldc
-```
-
-This should result in some summarizing CLI output in addition to a `test.vtk` file for visualization in Paraview.
diff --git a/ldc_2d/cpp/config.py b/ldc_2d/cpp/config.py
deleted file mode 100644
index 3ed8bd5..0000000
--- a/ldc_2d/cpp/config.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from boltzgen.lbm.model import *
-from boltzgen import Geometry
-
-descriptor = D2Q9
-geometry = Geometry(512, 512)
-tau = 0.52
-precision = 'single'
-
-## 3D LDC
-#descriptor = D3Q19
-#geometry = Geometry(64, 64, 64)
-#tau = 0.52
-#precision = 'single'
diff --git a/ldc_2d/cpp/generate.py b/ldc_2d/cpp/generate.py
deleted file mode 100755
index 4222e98..0000000
--- a/ldc_2d/cpp/generate.py
+++ /dev/null
@@ -1,40 +0,0 @@
-#!/usr/bin/env python
-
-import argparse
-
-from boltzgen import LBM, Generator, Geometry
-from boltzgen.lbm.model import D2Q9
-
-import config
-
-argparser = argparse.ArgumentParser(
- description = 'Generate a C++ 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()
-
-lbm = LBM(config.descriptor)
-generator = Generator(
- descriptor = config.descriptor,
- moments = lbm.moments(),
- collision = lbm.bgk(f_eq = lbm.equilibrium(), tau = config.tau),
- target = 'cpp',
- precision = config.precision,
- index = 'XYZ',
- layout = 'AOS')
-
-if args.output is None:
- args.output = '.'
-
-functions = ['collide_and_stream', 'equilibrilize', 'collect_moments', 'momenta_boundary']
-
-with open('%s/kernel.h' % args.output, 'w') as kernel:
- kernel.write(generator.kernel(config.geometry, functions))
-
-ldc_src = ''
-with open('ldc.cpp.mako', 'r') as template:
- ldc_src = template.read()
-
-with open('%s/ldc.cpp' % args.output, 'w') as app:
- app.write(generator.custom(config.geometry, ldc_src))
diff --git a/ldc_2d/cpp/ldc.cpp.mako b/ldc_2d/cpp/ldc.cpp.mako
deleted file mode 100644
index 5d480de..0000000
--- a/ldc_2d/cpp/ldc.cpp.mako
+++ /dev/null
@@ -1,176 +0,0 @@
-#include <cstdint>
-#include <memory>
-#include <vector>
-#include <chrono>
-#include <iostream>
-#include <fstream>
-
-#include "kernel.h"
-
-void collect_moments_to_vtk(const std::string& path, ${float_type}* f) {
- 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
-
- ${float_type} rho;
- ${float_type} u[${descriptor.d}];
-
- 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 < ${geometry.size_x-1}; ++x ) {
- collect_moments(f, x*${geometry.size_y}+y, rho, u);
- fout << u[0] << " " << u[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 < ${geometry.size_x-1}; ++x ) {
- collect_moments(f, x*${geometry.size_y*geometry.size_z}+y*${geometry.size_z}+z, rho, u);
- fout << u[0] << " " << u[1] << " " << u[2] << "\n";
- }
- }
- }
-% endif
-
- fout << "SCALARS density float 1\n";
- fout << "LOOKUP_TABLE default\n";
-% if descriptor.d == 2:
- for ( std::size_t y = 1; y < ${geometry.size_y-1}; ++y ) {
- for ( std::size_t x = 1; x < ${geometry.size_x-1}; ++x ) {
- collect_moments(f, x*${geometry.size_y}+y, rho, u);
- fout << rho << "\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 < ${geometry.size_x-1}; ++x ) {
- collect_moments(f, x*${geometry.size_y*geometry.size_z}+y*${geometry.size_z}+z, rho, u);
- fout << rho << "\n";
- }
- }
- }
-% endif
-
- fout.close();
-}
-
-void simulate(std::size_t nStep)
-{
- auto f_a = std::make_unique<${float_type}[]>(${geometry.volume*descriptor.q});
- auto f_b = std::make_unique<${float_type}[]>(${geometry.volume*descriptor.q});
-
- ${float_type}* f_prev = f_a.get();
- ${float_type}* f_next = f_b.get();
-
- std::vector<std::size_t> bulk;
- std::vector<std::size_t> lid_bc;
- std::vector<std::size_t> box_bc;
-
- for (int iX = 1; iX < ${geometry.size_x-1}; ++iX) {
- for (int iY = 1; iY < ${geometry.size_y-1}; ++iY) {
-% if descriptor.d == 2:
- const std::size_t iCell = iX*${geometry.size_y} + iY;
- 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 (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 << "#bulk : " << bulk.size() << std::endl;
- std::cout << "#lid : " << lid_bc.size() << std::endl;
- std::cout << "#wall : " << box_bc.size() << std::endl;
- std::cout << "#steps : " << nStep << std::endl;
- std::cout << std::endl;
-
- for (std::size_t iCell = 0; iCell < ${geometry.volume}; ++iCell) {
- equilibrilize(f_prev, f_next, iCell);
- }
-
- const auto start = std::chrono::high_resolution_clock::now();
-
- for (std::size_t iStep = 0; iStep < nStep; ++iStep) {
- if (iStep % 2 == 0) {
- f_next = f_a.get();
- f_prev = f_b.get();
- } else {
- f_next = f_b.get();
- f_prev = f_a.get();
- }
-
-#pragma omp parallel for
- for (std::size_t i = 0; i < bulk.size(); ++i) {
- collide_and_stream(f_next, f_prev, bulk[i]);
- }
- ${float_type} u[${descriptor.d}] { 0. };
-#pragma omp parallel for
- for (std::size_t i = 0; i < box_bc.size(); ++i) {
- velocity_momenta_boundary(f_next, f_prev, box_bc[i], u);
- }
- u[0] = 0.05;
-#pragma omp parallel for
- for (std::size_t i = 0; i < lid_bc.size(); ++i) {
- velocity_momenta_boundary(f_next, f_prev, lid_bc[i], u);
- }
- }
-
- auto duration = std::chrono::duration_cast<std::chrono::duration<double>>(
- std::chrono::high_resolution_clock::now() - start);
-
- std::cout << "MLUPS : " << nStep*${geometry.volume}/(1e6*duration.count()) << std::endl;
-
- collect_moments_to_vtk("test.vtk", f_next);
-}
-
-int main() {
- simulate(10000);
-}