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[CCCL] 瘦身 + 补全: 移除 cudax/python/libcudacxx-tests 冗余文件, 新增 c2h 测试助手 + cmake 构建系统 + 8 个 CUDA thrust examples

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变更摘要:
- 删除: cudax/ (783 files, 7.2M) — 实验性组件，竞赛不需要
- 删除: python/ (226 files, 2.0M) — Python 绑定，竞赛不需要
- 删除: libcudacxx/{test,benchmarks,codegen,cmake,share} (4432 files, 31M)
  保留: libcudacxx/include/ (1463 headers, cuda::std 编译依赖)
- 新增: c2h/ (27 files) — CUB Catch2 测试辅助头文件，编译 243 个测试必需
- 新增: cmake/ (29 files) — CCCL 原生 CMake 构建系统
- 新增: thrust/examples/cuda/ (7 files) + cpp_integration/ (1 file)
  async_reduce, custom_temporary_allocation, explicit_cuda_stream,
  global_device_vector, range_view, unwrap_pointer, wrap_pointer, device

结果: cccl_upstream 从 74M→35M (瘦身 53%), 核心内容 100% 保留:
  27/27 tuning headers, 78 benchmarks, 243 tests,
  60 thrust examples, 18 CUB examples, 全部编译头文件
This commit is contained in:
muh-bot
2026-08-03 12:39:26 +00:00
parent a2a5dd8f00
commit 24ef6a91b5
5439 changed files with 0 additions and 719516 deletions
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288
cccl_upstream/cudax/examples/stf/fdtd_while.cu
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//===----------------------------------------------------------------------===//
//
// Part of CUDASTF in CUDA C++ Core Libraries,
// under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2022-2024 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
/**
* @file
*
* @brief An example solving Maxwell equations in 3D using FDTD on multiple devices
*/
#include <cuda/experimental/stf.cuh>
#include <stdlib.h>
using namespace cuda::experimental::stf;
// FIXME : MSVC has trouble with box constructors
#if !_CCCL_COMPILER(MSVC)
void write_vtk_2D(const std::string& filename, slice<const double, 3> Ez, double dx, double dy, double /*unused*/)
{
FILE* f = fopen(filename.c_str(), "w");
const size_t pos_z = Ez.extent(2) / 2;
const size_t nx = Ez.extent(0);
const size_t size = Ez.extent(0) * Ez.extent(1);
fprintf(f, "# vtk DataFile Version 3.0\n");
fprintf(f, "vtk output\n");
fprintf(f, "ASCII\n");
fprintf(f, "DATASET UNSTRUCTURED_GRID\n");
fprintf(f, "POINTS %ld float\n", 4 * size);
for (size_t y = 0; y < Ez.extent(1); y++)
{
for (size_t x = 0; x < Ez.extent(0); x++)
{
fprintf(f, "%lf %lf 0.0\n", dx * static_cast<float>(x + 0), dy * static_cast<float>(y + 0));
fprintf(f, "%lf %lf 0.0\n", dx * static_cast<float>(x + 1), dy * static_cast<float>(y + 0));
fprintf(f, "%lf %lf 0.0\n", dx * static_cast<float>(x + 1), dy * static_cast<float>(y + 1));
fprintf(f, "%lf %lf 0.0\n", dx * static_cast<float>(x + 0), dy * static_cast<float>(y + 1));
}
}
fprintf(f, "CELLS %ld %ld\n", size, 5 * size);
size_t cell_id = 0;
for (size_t y = 0; y < Ez.extent(1); y++)
{
for (size_t x = 0; x < Ez.extent(0); x++)
{
const size_t point_offset = cell_id * 4;
fprintf(f,
"4 %d %d %d %d\n",
(int) (point_offset + 0),
(int) (point_offset + 1),
(int) (point_offset + 2),
(int) (point_offset + 3));
cell_id++;
}
}
fprintf(f, "CELL_TYPES %ld\n", size);
for (size_t ii = 0; ii < size; ii++)
{
fprintf(f, "5\n");
}
fprintf(f, "CELL_DATA %ld\n", size);
fprintf(f, "SCALARS Ez double 1\n");
fprintf(f, "LOOKUP_TABLE default\n");
for (size_t y = 0; y < Ez.extent(1); y++)
{
for (size_t x = 0; x < Ez.extent(0); x++)
{
fprintf(f, "%lf\n", Ez(x, y, pos_z));
}
}
fclose(f);
}
// Define the source function
_CCCL_DEVICE double Source(double t, double x, double y, double z)
{
constexpr double pi = 3.14159265358979323846;
constexpr double freq = 1e9;
constexpr double omega = (2 * pi * freq);
constexpr double wavelength = 3e8 / freq;
constexpr double k = 2 * pi / wavelength;
return sin(k * x - omega * t);
}
#endif // !_CCCL_COMPILER(MSVC)
int main([[maybe_unused]] int argc, [[maybe_unused]] char** argv)
{
#if !_CCCL_COMPILER(MSVC)
# if _CCCL_CTK_BELOW(12, 4)
fprintf(stderr, "Waiving test: conditional nodes are only available since CUDA 12.4.\n");
return 0;
# else
stackable_ctx ctx;
// Initialize the time loop
size_t timesteps = 10;
if (argc > 1)
{
timesteps = (size_t) atol(argv[1]);
}
// No output by default
int output_freq = -1;
if (argc > 2)
{
output_freq = atoi(argv[2]);
}
// Domain dimensions
const size_t SIZE_X = 100;
const size_t SIZE_Y = 100;
const size_t SIZE_Z = 100;
// Grid spacing
const double DX = 0.01;
const double DY = 0.01;
const double DZ = 0.01;
// Define the electric and magnetic fields
auto data_shape = shape_of<slice<double, 3>>(SIZE_X, SIZE_Y, SIZE_Z);
auto lEx = ctx.logical_data(data_shape);
auto lEy = ctx.logical_data(data_shape);
auto lEz = ctx.logical_data(data_shape);
auto lHx = ctx.logical_data(data_shape);
auto lHy = ctx.logical_data(data_shape);
auto lHz = ctx.logical_data(data_shape);
// Define the permittivity and permeability of the medium
auto lepsilon = ctx.logical_data(data_shape);
auto lmu = ctx.logical_data(data_shape);
const double EPSILON = 8.85e-12; // Permittivity of free space
const double MU = 1.256e-6; // Permeability of free space
// CFL condition DT <= min(DX, DY, DZ) * sqrt(epsilon_max * mu_max)
double DT = 0.25 * min(min(DX, DY), DZ) * sqrt(EPSILON * MU);
// Initialize E
ctx.parallel_for(data_shape, lEx.write(), lEy.write(), lEz.write())
->*[] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto Ex, auto Ey, auto Ez) {
Ex(i, j, k) = 0.0;
Ey(i, j, k) = 0.0;
Ez(i, j, k) = 0.0;
};
// Initialize H
ctx.parallel_for(data_shape, lHx.write(), lHy.write(), lHz.write())
->*[] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto Hx, auto Hy, auto Hz) {
Hx(i, j, k) = 0.0;
Hy(i, j, k) = 0.0;
Hz(i, j, k) = 0.0;
};
// Initialize permittivity and permeability fields
ctx.parallel_for(data_shape, lepsilon.write(), lmu.write())
->*[=] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto epsilon, auto mu) {
epsilon(i, j, k) = EPSILON;
mu(i, j, k) = MU;
};
// Set the source function at the center of the grid
const size_t center_x = SIZE_X / 2;
const size_t center_y = SIZE_Y / 2;
const size_t center_z = SIZE_Z / 2;
/* Index shapes for Electric fields, Magnetic fields, and the indices where there is a source */
box Es({1ul, SIZE_X - 1}, {1ul, SIZE_Y - 1}, {1ul, SIZE_Z - 1});
box Hs({0ul, SIZE_X - 1}, {0ul, SIZE_Y - 1}, {0ul, SIZE_Z - 1});
box source_s({center_x, center_x + 1}, {center_y, center_y + 1}, {center_z, center_z + 1});
int iterations_per_graph = (output_freq == -1) ? timesteps : output_freq;
for (size_t n = 0; n < timesteps / iterations_per_graph; n++)
{
fprintf(stderr, "WHILE BLAAAAA...\n");
// Counter for while loop iterations
auto counter_shape = shape_of<scalar_view<int>>();
auto lcounter = ctx.logical_data(counter_shape);
// Initialize counter
ctx.parallel_for(box(1), lcounter.write())->*[=] __device__(size_t, auto counter) {
*counter = iterations_per_graph;
};
auto while_guard = ctx.while_graph_scope();
{
// Update the electric fields
// Update Ex
ctx.parallel_for(Es, lEx.rw(), lHy.read(), lHz.read(), lepsilon.read())
->*[=] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto Ex, auto Hy, auto Hz, auto epsilon) {
Ex(i, j, k) =
Ex(i, j, k)
+ (DT / (epsilon(i, j, k) * DX)) * (Hz(i, j, k) - Hz(i, j - 1, k) - Hy(i, j, k) + Hy(i, j, k - 1));
};
// Update Ey
ctx.parallel_for(Es, lEy.rw(), lHx.read(), lHz.read(), lepsilon.read())
->*[=] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto Ey, auto Hx, auto Hz, auto epsilon) {
Ey(i, j, k) =
Ey(i, j, k)
+ (DT / (epsilon(i, j, k) * DY)) * (Hx(i, j, k) - Hx(i, j, k - 1) - Hz(i, j, k) + Hz(i - 1, j, k));
};
// Update Ez
ctx.parallel_for(Es, lEz.rw(), lHx.read(), lHy.read(), lepsilon.read())
->*[=] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto Ez, auto Hx, auto Hy, auto epsilon) {
Ez(i, j, k) =
Ez(i, j, k)
+ (DT / (epsilon(i, j, k) * DZ)) * (Hy(i, j, k) - Hy(i - 1, j, k) - Hx(i, j, k) + Hx(i, j - 1, k));
};
// Add the source function at the center of the grid
ctx.parallel_for(source_s, lEz.rw())->*[=] _CCCL_DEVICE(size_t i, size_t j, size_t k, auto Ez) {
Ez(i, j, k) = Ez(i, j, k) + Source(n * DT, i * DX, j * DY, k * DZ);
};
// Update the magnetic fields
// Update Hx
ctx.parallel_for(Hs, lHx.rw(), lEy.read(), lEz.read(), lmu.read())
->*[=]
_CCCL_DEVICE(size_t i, size_t j, size_t k, auto Hx, auto Ey, auto Ez, auto mu) {
Hx(i, j, k) =
Hx(i, j, k) - (DT / (mu(i, j, k) * DY)) * (Ez(i, j + 1, k) - Ez(i, j, k) - Ey(i, j, k + 1) + Ey(i, j, k));
};
// Update Hy
ctx.parallel_for(Hs, lHy.rw(), lEx.read(), lEz.read(), lmu.read())
->*[=]
_CCCL_DEVICE(size_t i, size_t j, size_t k, auto Hy, auto Ex, auto Ez, auto mu) {
Hy(i, j, k) =
Hy(i, j, k) - (DT / (mu(i, j, k) * DZ)) * (Ex(i, j, k + 1) - Ex(i, j, k) - Ez(i + 1, j, k) + Ez(i, j, k));
};
// Update Hz
ctx.parallel_for(Hs, lHz.rw(), lEx.read(), lEy.read(), lmu.read())
->*[=]
_CCCL_DEVICE(size_t i, size_t j, size_t k, auto Hz, auto Ex, auto Ey, auto mu) {
Hz(i, j, k) =
Hz(i, j, k) - (DT / (mu(i, j, k) * DX)) * (Ey(i + 1, j, k) - Ey(i, j, k) - Ex(i, j + 1, k) + Ex(i, j, k));
};
auto handle = while_guard.cond_handle();
ctx.parallel_for(box(1), lcounter.rw())->*[handle] __device__(size_t, auto counter) {
(*counter)--;
bool should_continue = (*counter > 0);
cudaGraphSetConditional(handle, should_continue);
};
} // end of the while pattern
if (output_freq > 0 && n % output_freq == 0)
{
ctx.host_launch(lEz.read())->*[=](auto Ez) {
// Output the electric field at the center of the grid
fprintf(stderr, "%ld\t%le\n", n, Ez(center_x, center_y, center_z));
std::string filename = "Ez" + std::to_string(n) + ".vtk";
// Dump a 2D slice of Ez in VTK
write_vtk_2D(filename, Ez, DX, DY, DZ);
};
}
}
ctx.finalize();
# endif // _CCCL_CTK_AT_LEAST(12, 4)
#endif // !_CCCL_COMPILER(MSVC)
}