Random CUDA&x27;s Mersenne捻线器,用于任意数量的螺纹
CUDA实现的Random CUDA&x27;s Mersenne捻线器,用于任意数量的螺纹,random,cuda,mersenne-twister,curand,Random,Cuda,Mersenne Twister,Curand,CUDA实现的Mersenne捻线器(MT)随机数生成器的最大线程数/块数限制为256和200块/网格,即最大线程数为51200 因此,不可能启动使用MT的内核 kernel<<<blocksPerGrid, threadsPerBlock>>>(devMTGPStates, ...) 而n是线程总数 对于线程>51200,使用MT的最佳方法是什么 我的方法是为blocksPerGrid和threadsPerBlock使用常量值,例如,并在内核代码中使用以下
Mersenne捻线器
(MT
)随机数生成器的最大线程数/块数限制为256
和200
块/网格,即最大线程数为51200
因此,不可能启动使用MT的内核
kernel<<<blocksPerGrid, threadsPerBlock>>>(devMTGPStates, ...)
而n
是线程总数
对于线程>51200
,使用MT
的最佳方法是什么
我的方法是为blocksPerGrid
和threadsPerBlock
使用常量值,例如
,并在内核代码中使用以下内容:
__global__ void kernel(curandStateMtgp32 *state, int n, ...) {
int id = threadIdx.x+blockIdx.x*blockDim.x;
while (id < n) {
float x = curand_normal(&state[blockIdx.x]);
/* some more calls to curand_normal() followed
by the algorithm that works with the data */
id += blockDim.x*gridDim.x;
}
}
\uuuu全局\uuuu无效内核(curandStateMtgp32*状态,int n,…{
int id=threadIdx.x+blockIdx.x*blockDim.x;
while(id
我不确定这是否是正确的方法,或者它是否会以不希望的方式影响机器翻译状态
谢谢。我建议你仔细彻底地阅读馆藏 当每个块使用256个线程(最多64个块)来生成数字时,MT API将最有效 如果您需要更多,您有多种选择:
一般来说,我认为您概述的内核没有问题,它与上面的选项1大致一致。但是,它不允许您超过51200个线程。(你的例子有16384个线程)我建议你仔细彻底地阅读文章 当每个块使用256个线程(最多64个块)来生成数字时,MT API将最有效 如果您需要更多,您有多种选择:
一般来说,我认为您概述的内核没有问题,它与上面的选项1大致一致。但是,它不允许您超过51200个线程。(您的示例有
so16384条线程)根据Robert的回答,下面我将提供一个关于使用cuRAND的Mersenne捻线器处理任意数量线程的完整示例。我使用Robert的第一个选项从现有状态集中生成更多的数字,并将这些数字分布到需要它们的线程中
// --- Generate random numbers with cuRAND's Mersenne Twister
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <cuda.h>
#include <curand_kernel.h>
/* include MTGP host helper functions */
#include <curand_mtgp32_host.h>
#define BLOCKSIZE 256
#define GRIDSIZE 64
/*******************/
/* GPU ERROR CHECK */
/*******************/
#define gpuErrchk(x) do { if((x) != cudaSuccess) { \
printf("Error at %s:%d\n",__FILE__,__LINE__); \
return EXIT_FAILURE;}} while(0)
#define CURAND_CALL(x) do { if((x) != CURAND_STATUS_SUCCESS) { \
printf("Error at %s:%d\n",__FILE__,__LINE__); \
return EXIT_FAILURE;}} while(0)
/*******************/
/* iDivUp FUNCTION */
/*******************/
__host__ __device__ int iDivUp(int a, int b) { return ((a % b) != 0) ? (a / b + 1) : (a / b); }
/*********************/
/* GENERATION KERNEL */
/*********************/
__global__ void generate_kernel(curandStateMtgp32 * __restrict__ state, float * __restrict__ result, const int N)
{
int tid = threadIdx.x + blockIdx.x * blockDim.x;
for (int k = tid; k < N; k += blockDim.x * gridDim.x)
result[k] = curand_uniform(&state[blockIdx.x]);
}
/********/
/* MAIN */
/********/
int main()
{
const int N = 217 * 123;
// --- Allocate space for results on host
float *hostResults = (float *)malloc(N * sizeof(float));
// --- Allocate and initialize space for results on device
float *devResults; gpuErrchk(cudaMalloc(&devResults, N * sizeof(float)));
gpuErrchk(cudaMemset(devResults, 0, N * sizeof(float)));
// --- Setup the pseudorandom number generator
curandStateMtgp32 *devMTGPStates; gpuErrchk(cudaMalloc(&devMTGPStates, GRIDSIZE * sizeof(curandStateMtgp32)));
mtgp32_kernel_params *devKernelParams; gpuErrchk(cudaMalloc(&devKernelParams, sizeof(mtgp32_kernel_params)));
CURAND_CALL(curandMakeMTGP32Constants(mtgp32dc_params_fast_11213, devKernelParams));
//CURAND_CALL(curandMakeMTGP32KernelState(devMTGPStates, mtgp32dc_params_fast_11213, devKernelParams, GRIDSIZE, 1234));
CURAND_CALL(curandMakeMTGP32KernelState(devMTGPStates, mtgp32dc_params_fast_11213, devKernelParams, GRIDSIZE, time(NULL)));
// --- Generate pseudo-random sequence and copy to the host
generate_kernel << <GRIDSIZE, BLOCKSIZE >> >(devMTGPStates, devResults, N);
gpuErrchk(cudaPeekAtLastError());
gpuErrchk(cudaDeviceSynchronize());
gpuErrchk(cudaMemcpy(hostResults, devResults, N * sizeof(float), cudaMemcpyDeviceToHost));
// --- Print results
//for (int i = 0; i < N; i++) {
for (int i = 0; i < 10; i++) {
printf("%f\n", hostResults[i]);
}
// --- Cleanup
gpuErrchk(cudaFree(devMTGPStates));
gpuErrchk(cudaFree(devResults));
free(hostResults);
return 0;
}
/---使用cuRAND的Mersenne捻线器生成随机数
#包括
#包括
#包括
#包括
#包括
/*包括MTGP主机帮助程序函数*/
#包括
#定义块大小256
#定义网格大小64
/*******************/
/*GPU错误检查*/
/*******************/
#定义gpuerchk(x)do{if((x)!=cudaSuccess){\
printf(“在%s处出现错误:%d\n”,\uuuuu文件\uuuuu,\uuuu行\uuuuu)\
返回EXIT_FAILURE;}}while(0)
#定义CURAND_CALL(x)do{if((x)!=CURAND_STATUS\u SUCCESS){\
printf(“在%s处出现错误:%d\n”,\uuuuu文件\uuuuu,\uuuu行\uuuuu)\
返回EXIT_FAILURE;}}while(0)
/*******************/
/*iDivUp函数*/
/*******************/
__主机设备iDivUp(INTA,INTB){返回((a%b)!=0)?(a/b+1):(a/b);}
/*********************/
/*生成内核*/
/*********************/
__全局\uuuuu无效生成\u内核(curandStateMtgp32*\uuuuu限制\uuuuuu状态,浮点*\uuuu限制\uuuuuuuuu结果,常量int N)
{
int tid=threadIdx.x+blockIdx.x*blockDim.x;
对于(int k=tid;k(devMTGPStates,devResults,N);
gpuerchk(cudaPeekAtLastError());
gpuErrchk(cudaDeviceSynchronize());
gpuerchk(cudaMemcpy(hostResults,devResults,N*sizeof(float),cudaMemcpyDeviceToHost));
//---打印结果
//对于(int i=0;i// --- Generate random numbers with cuRAND's Mersenne Twister
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <cuda.h>
#include <curand_kernel.h>
/* include MTGP host helper functions */
#include <curand_mtgp32_host.h>
#define BLOCKSIZE 256
#define GRIDSIZE 64
/*******************/
/* GPU ERROR CHECK */
/*******************/
#define gpuErrchk(x) do { if((x) != cudaSuccess) { \
printf("Error at %s:%d\n",__FILE__,__LINE__); \
return EXIT_FAILURE;}} while(0)
#define CURAND_CALL(x) do { if((x) != CURAND_STATUS_SUCCESS) { \
printf("Error at %s:%d\n",__FILE__,__LINE__); \
return EXIT_FAILURE;}} while(0)
/*******************/
/* iDivUp FUNCTION */
/*******************/
__host__ __device__ int iDivUp(int a, int b) { return ((a % b) != 0) ? (a / b + 1) : (a / b); }
/*********************/
/* GENERATION KERNEL */
/*********************/
__global__ void generate_kernel(curandStateMtgp32 * __restrict__ state, float * __restrict__ result, const int N)
{
int tid = threadIdx.x + blockIdx.x * blockDim.x;
for (int k = tid; k < N; k += blockDim.x * gridDim.x)
result[k] = curand_uniform(&state[blockIdx.x]);
}
/********/
/* MAIN */
/********/
int main()
{
const int N = 217 * 123;
// --- Allocate space for results on host
float *hostResults = (float *)malloc(N * sizeof(float));
// --- Allocate and initialize space for results on device
float *devResults; gpuErrchk(cudaMalloc(&devResults, N * sizeof(float)));
gpuErrchk(cudaMemset(devResults, 0, N * sizeof(float)));
// --- Setup the pseudorandom number generator
curandStateMtgp32 *devMTGPStates; gpuErrchk(cudaMalloc(&devMTGPStates, GRIDSIZE * sizeof(curandStateMtgp32)));
mtgp32_kernel_params *devKernelParams; gpuErrchk(cudaMalloc(&devKernelParams, sizeof(mtgp32_kernel_params)));
CURAND_CALL(curandMakeMTGP32Constants(mtgp32dc_params_fast_11213, devKernelParams));
//CURAND_CALL(curandMakeMTGP32KernelState(devMTGPStates, mtgp32dc_params_fast_11213, devKernelParams, GRIDSIZE, 1234));
CURAND_CALL(curandMakeMTGP32KernelState(devMTGPStates, mtgp32dc_params_fast_11213, devKernelParams, GRIDSIZE, time(NULL)));
// --- Generate pseudo-random sequence and copy to the host
generate_kernel << <GRIDSIZE, BLOCKSIZE >> >(devMTGPStates, devResults, N);
gpuErrchk(cudaPeekAtLastError());
gpuErrchk(cudaDeviceSynchronize());
gpuErrchk(cudaMemcpy(hostResults, devResults, N * sizeof(float), cudaMemcpyDeviceToHost));
// --- Print results
//for (int i = 0; i < N; i++) {
for (int i = 0; i < 10; i++) {
printf("%f\n", hostResults[i]);
}
// --- Cleanup
gpuErrchk(cudaFree(devMTGPStates));
gpuErrchk(cudaFree(devResults));
free(hostResults);
return 0;
}