NASP/cuda-samples
84
0
Fork 0
mirror of https://github.com/NVIDIA/cuda-samples.git synced 2026-10-13 00:08:26 +08:00
Code Issues Packages Projects Releases Wiki Activity

CUDA 13.2 samples update (#432)

Browse Source 
- Added Python samples for CUDA Python 1.0 release
- Renamed top-level `Samples` directory to `cpp` to accommodate Python samples.
This commit is contained in:
Dheemanth
2026-05-13 15:13:18 -07:00
committed by GitHub
parent a4526d5229
commit aeab82ff30
2072 changed files with 15077 additions and 1970 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/.vscode/c_cpp_properties.json vendored Normal file
View File

@@ -0,0 +1,18 @@
{
"configurations": [
{
"name": "Linux",
"includePath": [
"${workspaceFolder}/**",
"${workspaceFolder}/../../../Common"
],
"defines": [],
"compilerPath": "/usr/local/cuda/bin/nvcc",
"cStandard": "gnu17",
"cppStandard": "gnu++14",
"intelliSenseMode": "linux-gcc-x64",
"configurationProvider": "ms-vscode.makefile-tools"
}
],
"version": 4
}

7
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/.vscode/extensions.json vendored Normal file
View File

@@ -0,0 +1,7 @@
{
"recommendations": [
"nvidia.nsight-vscode-edition",
"ms-vscode.cpptools",
"ms-vscode.makefile-tools"
]
}

43
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/CMakeLists.txt Normal file
View File

@@ -0,0 +1,43 @@
cmake_minimum_required(VERSION 3.20)
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../cmake/Modules")
project(MC_EstimatePiP LANGUAGES C CXX CUDA)
find_package(CUDAToolkit REQUIRED)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
set(CMAKE_CUDA_ARCHITECTURES 75 80 86 87 89 90 100 110 120)
set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -Wno-deprecated-gpu-targets")
if(ENABLE_CUDA_DEBUG)
set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -G") # enable cuda-gdb (may significantly affect performance on some targets)
else()
set(CMAKE_CUDA_FLAGS "${CMAKE_CUDA_FLAGS} -lineinfo") # add line information to all builds for debug tools (exclusive to -G option)
endif()
# Include directories and libraries
include_directories(../../../Common)
# Source file
# Add target for MC_EstimatePiP
add_executable(MC_EstimatePiP src/main.cpp src/piestimator.cu src/test.cpp)
target_compile_options(MC_EstimatePiP PRIVATE $<$<COMPILE_LANGUAGE:CUDA>:--extended-lambda>)
target_compile_features(MC_EstimatePiP PRIVATE cxx_std_17 cuda_std_17)
set_target_properties(MC_EstimatePiP PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
target_include_directories(MC_EstimatePiP PUBLIC
${CMAKE_CURRENT_SOURCE_DIR}/inc
${CUDAToolkit_INCLUDE_DIRS}
)
target_link_libraries(MC_EstimatePiP PUBLIC
CUDA::curand
)
# Include installation configuration
include(${CMAKE_CURRENT_SOURCE_DIR}/../../../cmake/InstallSamples.cmake)
setup_samples_install()

36
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/README.md Normal file
View File

@@ -0,0 +1,36 @@
# MC_EstimatePiP - Monte Carlo Estimation of Pi (batch PRNG)
## Description
This sample uses Monte Carlo simulation for Estimation of Pi (using batch PRNG). This sample also uses the NVIDIA CURAND library.
## Key Concepts
Random Number Generator, Computational Finance, CURAND Library
## Supported SM Architectures
[SM 5.0 ](https://developer.nvidia.com/cuda-gpus) [SM 5.2 ](https://developer.nvidia.com/cuda-gpus) [SM 5.3 ](https://developer.nvidia.com/cuda-gpus) [SM 6.0 ](https://developer.nvidia.com/cuda-gpus) [SM 6.1 ](https://developer.nvidia.com/cuda-gpus) [SM 7.0 ](https://developer.nvidia.com/cuda-gpus) [SM 7.2 ](https://developer.nvidia.com/cuda-gpus) [SM 7.5 ](https://developer.nvidia.com/cuda-gpus) [SM 8.0 ](https://developer.nvidia.com/cuda-gpus) [SM 8.6 ](https://developer.nvidia.com/cuda-gpus) [SM 8.7 ](https://developer.nvidia.com/cuda-gpus) [SM 8.9 ](https://developer.nvidia.com/cuda-gpus) [SM 9.0 ](https://developer.nvidia.com/cuda-gpus)
## Supported OSes
Linux, Windows
## Supported CPU Architecture
x86_64, armv7l
## CUDA APIs involved
### [CUDA Runtime API](http://docs.nvidia.com/cuda/cuda-runtime-api/index.html)
cudaMemcpy, cudaGetErrorString, cudaFree, cudaSetDevice, cudaGetDeviceCount, cudaMalloc, cudaFuncGetAttributes, cudaGetDeviceProperties
## Dependencies needed to build/run
[CURAND](../../../README.md#curand)
## Prerequisites
Download and install the [CUDA Toolkit](https://developer.nvidia.com/cuda-downloads) for your corresponding platform.
Make sure the dependencies mentioned in [Dependencies]() section above are installed.
## References (for more details)

102
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/inc/cudasharedmem.h Normal file
View File

@@ -0,0 +1,102 @@
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CUDASHAREDMEM_H
#define CUDASHAREDMEM_H
//****************************************************************************
// Because dynamically sized shared memory arrays are declared "extern",
// we can't templatize them directly. To get around this, we declare a
// simple wrapper struct that will declare the extern array with a different
// name depending on the type. This avoids compiler errors about duplicate
// definitions.
//
// To use dynamically allocated shared memory in a templatized __global__ or
// __device__ function, just replace code like this:
// template<class T>
// __global__ void
// foo( T* g_idata, T* g_odata)
// {
// // Shared mem size is determined by the host app at run time
// extern __shared__ T sdata[];
// ...
// x = sdata[i];
// sdata[i] = x;
// ...
// }
//
// With this:
// template<class T>
// __global__ void
// foo( T* g_idata, T* g_odata)
// {
// // Shared mem size is determined by the host app at run time
// SharedMemory<T> sdata;
// ...
// x = sdata[i];
// sdata[i] = x;
// ...
// }
//****************************************************************************
// This is the un-specialized struct. Note that we prevent instantiation of
// this struct by making it abstract (i.e. with pure virtual methods).
template <typename T> struct SharedMemory
{
// Ensure that we won't compile any un-specialized types
virtual __device__ T &operator*() = 0;
virtual __device__ T &operator[](int i) = 0;
};
#define BUILD_SHAREDMEMORY_TYPE(t, n) \
template <> struct SharedMemory<t> \
{ \
__device__ t &operator*() \
{ \
extern __shared__ t n[]; \
return *n; \
} \
__device__ t &operator[](int i) \
{ \
extern __shared__ t n[]; \
return n[i]; \
} \
}
BUILD_SHAREDMEMORY_TYPE(int, s_int);
BUILD_SHAREDMEMORY_TYPE(unsigned int, s_uint);
BUILD_SHAREDMEMORY_TYPE(char, s_char);
BUILD_SHAREDMEMORY_TYPE(unsigned char, s_uchar);
BUILD_SHAREDMEMORY_TYPE(short, s_short);
BUILD_SHAREDMEMORY_TYPE(unsigned short, s_ushort);
BUILD_SHAREDMEMORY_TYPE(long, s_long);
BUILD_SHAREDMEMORY_TYPE(unsigned long, s_ulong);
BUILD_SHAREDMEMORY_TYPE(bool, s_bool);
BUILD_SHAREDMEMORY_TYPE(float, s_float);
BUILD_SHAREDMEMORY_TYPE(double, s_double);
#endif

44
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/inc/piestimator.h Normal file
View File

@@ -0,0 +1,44 @@
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PIESTIMATOR_H
#define PIESTIMATOR_H
template <typename Real> class PiEstimator
{
public:
PiEstimator(unsigned int numSims, unsigned int device, unsigned int threadBlockSize, unsigned int seed);
Real operator()();
private:
unsigned int m_seed;
unsigned int m_numSims;
unsigned int m_device;
unsigned int m_threadBlockSize;
};
#endif

60
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/inc/test.h Normal file
View File

@@ -0,0 +1,60 @@
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TEST_H
#define TEST_H
template <typename Real> struct Test
{
Test()
: pass(false) {};
int device;
unsigned int numSims;
unsigned int threadBlockSize;
unsigned int seed;
bool pass;
double elapsedTime;
bool operator()();
};
// Defaults are arbitrary to give sensible runtime
#define k_sims_min 100000
#define k_sims_max 10000000
#define k_sims_def 100000
#define k_sims_qa 100000
#define k_bsize_min 32
#define k_bsize_def 128
#define k_bsize_qa 128
#define k_seed_def 1234
// Target value
#define PI 3.14159265359
#endif

255
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/src/main.cpp Normal file
View File

@@ -0,0 +1,255 @@
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
///////////////////////////////////////////////////////////////////////////////
// Monte Carlo: Estimate Pi
// ========================
//
// This sample demonstrates a very simple Monte Carlo estimation for Pi.
//
// This file, main.cpp, contains the setup information to run the test, for
// example parsing the command line and integrating this sample with the
// samples framework. As such it is perhaps less interesting than the guts of
// the sample. Readers wishing to skip the clutter are advised to skip straight
// to Test.operator() in test.cpp.
///////////////////////////////////////////////////////////////////////////////
#include <cuda_runtime.h>
#include <helper_cuda.h>
#include <helper_timer.h>
#include <iomanip>
#include <iostream>
#include <math.h>
#include <stdexcept>
#include "../inc/test.h"
// SDK information
static const char *printfFile = "MonteCarloEstimatePiP.txt";
// Forward declarations
void showHelp(const int argc, const char **argv);
template <typename Real> void runTest(int argc, const char **argv);
int main(int argc, char **argv)
{
using std::invalid_argument;
using std::string;
// Open the log file
printf("Monte Carlo Estimate Pi (with batch PRNG)\n");
printf("=========================================\n\n");
// If help flag is set, display help and exit immediately
if (checkCmdLineFlag(argc, (const char **)argv, "help")) {
printf("Displaying help on console\n");
showHelp(argc, (const char **)argv);
exit(EXIT_SUCCESS);
}
// Check the precision (checked against the device capability later)
try {
char *value;
if (getCmdLineArgumentString(argc, (const char **)argv, "precision", &value)) {
// Check requested precision is valid
string prec(value);
if (prec.compare("single") == 0 || prec.compare("\"single\"") == 0) {
runTest<float>(argc, (const char **)argv);
}
else if (prec.compare("double") == 0 || prec.compare("\"double\"") == 0) {
runTest<double>(argc, (const char **)argv);
}
else {
printf("specified precision (%s) is invalid, must be \"single\".\n", value);
throw invalid_argument("precision");
}
}
else {
runTest<float>(argc, (const char **)argv);
}
}
catch (invalid_argument &e) {
printf("invalid command line argument (%s)\n", e.what());
exit(EXIT_FAILURE);
}
// Finish
exit(EXIT_SUCCESS);
}
template <typename Real> void runTest(int argc, const char **argv)
{
using std::invalid_argument;
using std::runtime_error;
try {
Test<Real> test;
int deviceCount = 0;
cudaError_t cudaResult = cudaSuccess;
// by default specify GPU Device == 0
test.device = 0;
// Get number of available devices
cudaResult = cudaGetDeviceCount(&deviceCount);
if (cudaResult != cudaSuccess) {
printf("could not get device count.\n");
throw runtime_error("cudaGetDeviceCount");
}
// (default parameters)
test.numSims = k_sims_qa;
test.threadBlockSize = k_bsize_qa;
test.seed = k_seed_def;
{
char *value = 0;
if (getCmdLineArgumentString(argc, argv, "device", &value)) {
test.device = (int)atoi(value);
if (test.device >= deviceCount) {
printf("invalid target device specified on command line (device %d does "
"not exist).\n",
test.device);
throw invalid_argument("device");
}
}
else {
test.device = gpuGetMaxGflopsDeviceId();
}
if (getCmdLineArgumentString(argc, argv, "sims", &value)) {
test.numSims = (unsigned int)atoi(value);
if (test.numSims < k_sims_min || test.numSims > k_sims_max) {
printf("specified number of simulations (%d) is invalid, must be "
"between %d and %d.\n",
test.numSims,
k_sims_min,
k_sims_max);
throw invalid_argument("sims");
}
}
else {
test.numSims = k_sims_def;
}
if (getCmdLineArgumentString(argc, argv, "block-size", &value)) {
// Determine max threads per block
cudaDeviceProp deviceProperties;
cudaResult = cudaGetDeviceProperties(&deviceProperties, test.device);
if (cudaResult != cudaSuccess) {
printf("cound not get device properties for device %d.\n", test.device);
throw runtime_error("cudaGetDeviceProperties");
}
// Check requested size is valid
test.threadBlockSize = (unsigned int)atoi(value);
if (test.threadBlockSize < k_bsize_min
|| test.threadBlockSize > static_cast<unsigned int>(deviceProperties.maxThreadsPerBlock)) {
printf("specified block size (%d) is invalid, must be between %d and %d "
"for device %d.\n",
test.threadBlockSize,
k_bsize_min,
deviceProperties.maxThreadsPerBlock,
test.device);
throw invalid_argument("block-size");
}
if (test.threadBlockSize & test.threadBlockSize - 1) {
printf("specified block size (%d) is invalid, must be a power of two "
"(see reduction function).\n",
test.threadBlockSize);
throw invalid_argument("block-size");
}
}
else {
test.threadBlockSize = k_bsize_def;
}
if (getCmdLineArgumentString(argc, argv, "seed", &value)) {
// Check requested seed is valid
test.seed = (unsigned int)atoi(value);
if (test.seed == 0) {
printf("specified seed (%d) is invalid, must be non-zero.\n", test.seed);
throw invalid_argument("seed");
}
}
else {
test.seed = k_seed_def;
}
}
// Execute
test();
}
catch (invalid_argument &e) {
printf("invalid command line argument (%s)\n", e.what());
exit(EXIT_FAILURE);
}
catch (runtime_error &e) {
printf("runtime error (%s)\n", e.what());
exit(EXIT_FAILURE);
}
}
void showHelp(int argc, const char **argv)
{
using std::cout;
using std::endl;
using std::left;
using std::setw;
if (argc > 0) {
cout << endl << argv[0] << endl;
}
cout << endl << "Syntax:" << endl;
cout << left;
cout << " " << setw(20) << "--device=<device>"
<< "Specify device to use for execution" << endl;
cout << " " << setw(20) << "--sims=<N>"
<< "Specify number of Monte Carlo simulations" << endl;
cout << " " << setw(20) << "--block-size=<N>"
<< "Specify number of threads per block" << endl;
cout << " " << setw(20) << "--seed=<N>"
<< "Specify the seed to use for the random number generator" << endl;
cout << " " << setw(20) << "--precision=<P>"
<< "Specify the precision (\"single\" or \"double\")" << endl;
cout << endl;
cout << " " << setw(20) << "--noprompt"
<< "Skip prompt before exit" << endl;
cout << endl;
}

291
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/src/piestimator.cu Normal file
View File

@@ -0,0 +1,291 @@
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <cooperative_groups.h>
#include <cuda_runtime.h>
#include <numeric>
#include <stdexcept>
#include <string>
#include <typeinfo>
#include <vector>
#include "../inc/piestimator.h"
namespace cg = cooperative_groups;
#include <curand.h>
using std::string;
using std::vector;
__device__ unsigned int reduce_sum(unsigned int in, cg::thread_block cta)
{
extern __shared__ unsigned int sdata[];
// Perform first level of reduction:
// - Write to shared memory
unsigned int ltid = threadIdx.x;
sdata[ltid] = in;
cg::sync(cta);
// Do reduction in shared mem
for (unsigned int s = blockDim.x / 2; s > 0; s >>= 1) {
if (ltid < s) {
sdata[ltid] += sdata[ltid + s];
}
cg::sync(cta);
}
return sdata[0];
}
// Estimator kernel
template <typename Real>
__global__ void computeValue(unsigned int *const results, const Real *const points, const unsigned int numSims)
{
// Handle to thread block group
cg::thread_block cta = cg::this_thread_block();
// Determine thread ID
unsigned int bid = blockIdx.x;
unsigned int tid = blockIdx.x * blockDim.x + threadIdx.x;
unsigned int step = gridDim.x * blockDim.x;
// Shift the input/output pointers
const Real *pointx = points + tid;
const Real *pointy = pointx + numSims;
// Count the number of points which lie inside the unit quarter-circle
unsigned int pointsInside = 0;
for (unsigned int i = tid; i < numSims; i += step, pointx += step, pointy += step) {
Real x = *pointx;
Real y = *pointy;
Real l2norm2 = x * x + y * y;
if (l2norm2 < static_cast<Real>(1)) {
pointsInside++;
}
}
// Reduce within the block
pointsInside = reduce_sum(pointsInside, cta);
// Store the result
if (threadIdx.x == 0) {
results[bid] = pointsInside;
}
}
template <typename Real>
PiEstimator<Real>::PiEstimator(unsigned int numSims,
unsigned int device,
unsigned int threadBlockSize,
unsigned int seed)
: m_numSims(numSims)
, m_device(device)
, m_threadBlockSize(threadBlockSize)
, m_seed(seed)
{
}
template <typename Real> Real PiEstimator<Real>::operator()()
{
cudaError_t cudaResult = cudaSuccess;
struct cudaDeviceProp deviceProperties;
struct cudaFuncAttributes funcAttributes;
// Get device properties
cudaResult = cudaGetDeviceProperties(&deviceProperties, m_device);
if (cudaResult != cudaSuccess) {
string msg("Could not get device properties: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
// Check precision is valid
if (typeid(Real) == typeid(double)
&& (deviceProperties.major < 1 || (deviceProperties.major == 1 && deviceProperties.minor < 3))) {
throw std::runtime_error("Device does not have double precision support");
}
// Attach to GPU
cudaResult = cudaSetDevice(m_device);
if (cudaResult != cudaSuccess) {
string msg("Could not set CUDA device: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
// Determine how to divide the work between cores
dim3 block;
dim3 grid;
block.x = m_threadBlockSize;
grid.x = (m_numSims + m_threadBlockSize - 1) / m_threadBlockSize;
// Aim to launch around ten or more times as many blocks as there
// are multiprocessors on the target device.
unsigned int blocksPerSM = 10;
unsigned int numSMs = deviceProperties.multiProcessorCount;
while (grid.x > 2 * blocksPerSM * numSMs) {
grid.x >>= 1;
}
// Get computeValue function properties and check the maximum block size
cudaResult = cudaFuncGetAttributes(&funcAttributes, computeValue<Real>);
if (cudaResult != cudaSuccess) {
string msg("Could not get function attributes: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
if (block.x > (unsigned int)funcAttributes.maxThreadsPerBlock) {
throw std::runtime_error("Block X dimension is too large for computeValue kernel");
}
// Check the dimensions are valid
if (block.x > (unsigned int)deviceProperties.maxThreadsDim[0]) {
throw std::runtime_error("Block X dimension is too large for device");
}
if (grid.x > (unsigned int)deviceProperties.maxGridSize[0]) {
throw std::runtime_error("Grid X dimension is too large for device");
}
// Allocate memory for points
// Each simulation has two random numbers to give X and Y coordinate
Real *d_points = 0;
cudaResult = cudaMalloc((void **)&d_points, 2 * m_numSims * sizeof(Real));
if (cudaResult != cudaSuccess) {
string msg("Could not allocate memory on device for random numbers: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
// Allocate memory for result
// Each thread block will produce one result
unsigned int *d_results = 0;
cudaResult = cudaMalloc((void **)&d_results, grid.x * sizeof(unsigned int));
if (cudaResult != cudaSuccess) {
string msg("Could not allocate memory on device for partial results: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
// Generate random points in unit square
curandStatus_t curandResult;
curandGenerator_t prng;
curandResult = curandCreateGenerator(&prng, CURAND_RNG_PSEUDO_DEFAULT);
if (curandResult != CURAND_STATUS_SUCCESS) {
string msg("Could not create pseudo-random number generator: ");
msg += curandResult;
throw std::runtime_error(msg);
}
curandResult = curandSetPseudoRandomGeneratorSeed(prng, m_seed);
if (curandResult != CURAND_STATUS_SUCCESS) {
string msg("Could not set seed for pseudo-random number generator: ");
msg += curandResult;
throw std::runtime_error(msg);
}
if (typeid(Real) == typeid(float)) {
curandResult = curandGenerateUniform(prng, (float *)d_points, 2 * m_numSims);
}
else if (typeid(Real) == typeid(double)) {
curandResult = curandGenerateUniformDouble(prng, (double *)d_points, 2 * m_numSims);
}
else {
string msg("Could not generate random numbers of specified type");
throw std::runtime_error(msg);
}
if (curandResult != CURAND_STATUS_SUCCESS) {
string msg("Could not generate pseudo-random numbers: ");
msg += curandResult;
throw std::runtime_error(msg);
}
curandResult = curandDestroyGenerator(prng);
if (curandResult != CURAND_STATUS_SUCCESS) {
string msg("Could not destroy pseudo-random number generator: ");
msg += curandResult;
throw std::runtime_error(msg);
}
// Count the points inside unit quarter-circle
computeValue<Real><<<grid, block, block.x * sizeof(unsigned int)>>>(d_results, d_points, m_numSims);
// Copy partial results back
vector<unsigned int> results(grid.x);
cudaResult = cudaMemcpy(&results[0], d_results, grid.x * sizeof(unsigned int), cudaMemcpyDeviceToHost);
if (cudaResult != cudaSuccess) {
string msg("Could not copy partial results to host: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
// Complete sum-reduction on host
Real value = static_cast<Real>(std::accumulate(results.begin(), results.end(), 0));
// Determine the proportion of points inside the quarter-circle,
// i.e. the area of the unit quarter-circle
value /= m_numSims;
// Value is currently an estimate of the area of a unit quarter-circle, so we
// can scale to a full circle by multiplying by four. Now since the area of a
// circle is pi * r^2, and r is one, the value will be an estimate for the
// value of pi.
value *= 4;
// Cleanup
if (d_points) {
cudaFree(d_points);
d_points = 0;
}
if (d_results) {
cudaFree(d_results);
d_results = 0;
}
return value;
}
// Explicit template instantiation
template class PiEstimator<float>;
template class PiEstimator<double>;

110
cpp/2_Concepts_and_Techniques/MC_EstimatePiP/src/test.cpp Normal file
View File

@@ -0,0 +1,110 @@
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "../inc/test.h"
#include <cassert>
#include <cuda_runtime.h>
#include <helper_timer.h>
#include <iomanip>
#include <iostream>
#include <math.h>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <stdio.h>
#include <typeinfo>
#include "../inc/piestimator.h"
template <typename Real> bool Test<Real>::operator()()
{
using std::endl;
using std::setw;
using std::stringstream;
StopWatchInterface *timer = NULL;
sdkCreateTimer(&timer);
// Get device properties
struct cudaDeviceProp deviceProperties;
cudaError_t cudaResult = cudaGetDeviceProperties(&deviceProperties, device);
if (cudaResult != cudaSuccess) {
std::string msg("Could not get device properties: ");
msg += cudaGetErrorString(cudaResult);
throw std::runtime_error(msg);
}
// Evaluate on GPU
printf("Estimating Pi on GPU (%s)\n\n", deviceProperties.name);
PiEstimator<Real> estimator(numSims, device, threadBlockSize, seed);
sdkStartTimer(&timer);
Real result = estimator();
sdkStopTimer(&timer);
elapsedTime = sdkGetAverageTimerValue(&timer) / 1000.0f;
// Tolerance to compare result with expected
// This is just to check that nothing has gone very wrong with the
// test, the actual accuracy of the result depends on the number of
// Monte Carlo trials
const Real tolerance = static_cast<Real>(0.01);
// Display results
Real abserror = fabs(result - static_cast<float>(PI));
Real relerror = abserror / static_cast<float>(PI);
printf("Precision: %s\n", (typeid(Real) == typeid(double)) ? "double" : "single");
printf("Number of sims: %d\n", numSims);
printf("Tolerance: %e\n", tolerance);
printf("GPU result: %e\n", result);
printf("Expected: %e\n", PI);
printf("Absolute error: %e\n", abserror);
printf("Relative error: %e\n\n", relerror);
// Check result
if (relerror > tolerance) {
printf("computed result (%e) does not match expected result (%e).\n", result, PI);
pass = false;
}
else {
pass = true;
}
// Print results
printf("MonteCarloEstimatePiP, Performance = %.2f sims/s, Time = %.2f(ms), "
"NumDevsUsed = %u, Blocksize = %u\n",
numSims / elapsedTime,
elapsedTime * 1000.0f,
1,
threadBlockSize);
return pass;
}
// Explicit template instantiation
template struct Test<float>;
template struct Test<double>;