http://www.thesalmons.org/john/random123/releases/1.00/docs/index.html
我很难看到 opencl 和 random123 的示例，因为我是 OpenCL 的新手，我不确定在使用 Visual Studio 2010 时如何使用提供的信息。
任何可以编写使用上述库生成随机数并使用 Visual Studio 2010 的指南的人。
更新： 我解决了如下问题，现在想知道如何更改种子，以便在每次运行时获得随机数。
int main(int argc, char **argv)
{
const char *kernelname = "counthits";
unsigned count =10000;
cl_int err;
cl::Context cl_context;
cl::Program program;
cl::Kernel cl_kernel;
cl::Buffer cl_out;
cl::CommandQueue cl_queue;
size_t i, nthreads, hits_sz;
size_t cores, work_group_size;
cl_uint2 * hits_host;
double d = 0.; // timer
d = timer(&d);
progname = argv[0];
std::vector< cl::Platform > platformList;
CHECK(cl::Platform::get(&platformList));
CHECKERR( cl_context = createCLContext(CL_DEVICE_TYPE_GPU,cl_vendor::VENDOR_AMD, &err) );
std::vector<cl::Device> devices;
CHECKERR( devices = cl_context.getInfo<CL_CONTEXT_DEVICES>(&err) );
size_t length = 0;
const char * sourceStr = loadFileToString("pi_opencl_kernel.ocl","",&length);
cl::Program::Sources sources(1, std::make_pair(sourceStr, length));
program = cl::Program(cl_context, sources);
CHECK( program.build(devices,"-I D:\\libs\\Random123\\1.06\\include") );
CHECKERR(work_group_size = devices[0].getInfo<CL_DEVICE_MAX_WORK_GROUP_SIZE>(&err) );
CHECKERR(cores = devices[0].getInfo<CL_DEVICE_MAX_COMPUTE_UNITS>(&err) );
cores *= 16*4; //Tahiti.
if (work_group_size > 64) work_group_size /= 2;
nthreads = cores * work_group_size*32; //2048*128 = 262144
if (count == 0)
count = NTRIES/nthreads; //38
printf("Count: %lu\n",count);
hits_sz = nthreads * sizeof(hits_host[0]);//2097152
CHECKNOTZERO(hits_host = (cl_uint2 *)malloc(hits_sz));
CHECKERR ( cl_out = cl::Buffer( cl_context, CL_MEM_WRITE_ONLY | CL_MEM_USE_HOST_PTR, hits_sz, hits_host, &err));
CHECKERR ( cl_kernel = cl::Kernel(program,kernelname,&err) );
CHECK ( cl_kernel.setArg( 0, count) );
CHECK ( cl_kernel.setArg( 1, cl_out) );
CHECKERR (cl_queue = cl::CommandQueue(cl_context, devices[0], 0, &err) );
cl::Event event;
CHECK( cl_queue.enqueueNDRangeKernel(cl_kernel,cl::NullRange,cl::NDRange(nthreads), cl::NDRange(work_group_size), NULL, &event) );
event.wait();
CHECK( cl_queue.enqueueReadBuffer(cl_out, CL_TRUE, 0,hits_sz, hits_host) );
unsigned long hits = 0, tries = 0;
for (i = 0; i < nthreads; i++) {
#ifdef _DEBUG
printf("%lu %u %u\n", (unsigned long)i, hits_host[i].s[0], hits_host[i].s[1]);
#endif
hits += hits_host[i].s[0];
tries += hits_host[i].s[1];
}
return pi_check(hits, tries);
}
核心：
#include <Random123/threefry.h>
/*
* counthits generates 2*n x,y points and returns hits[tid] with
* the count of number of those points within the unit circle on
* each thread.
*/
__kernel void counthits(unsigned n, __global uint2 *hitsp) {
unsigned tid = get_global_id(0);
unsigned hits = 0, tries = 0;
threefry4x32_key_t k = {{tid, 0xdecafbad, 0xfacebead, 0x12345678}};
threefry4x32_ctr_t c = {{0, 0xf00dcafe, 0xdeadbeef, 0xbeeff00d}};
while (tries < n) {
union {
threefry4x32_ctr_t c;
int4 i;
} u;
c.v[0]++;
u.c = threefry4x32(c, k);
long x1 = u.i.x, y1 = u.i.y;
long x2 = u.i.z, y2 = u.i.w;
if ((x1*x1 + y1*y1) < (1L<<62)) {
hits++;
}
tries++;
if ((x2*x2 + y2*y2) < (1L<<62)) {
hits++;
}
tries++;
}
hitsp[tid].x = hits;
hitsp[tid].y = tries;
}