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#include <algorithm>
#include <iostream>
#include <cassert>
#include <string>
#include <vector>
#include <numeric>
#include <CL/cl.h>
#include <Tracy.hpp>
#include <TracyOpenCL.hpp>
#define CL_ASSERT(err) \
if((err) != CL_SUCCESS) \
{ \
std::cerr << "OpenCL Call Returned " << err << std::endl; \
assert(false); \
}
const char kernelSource[] =
" void __kernel vectorAdd(global float* C, global float* A, global float* B, int N) "
" { "
" int i = get_global_id(0); "
" if (i < N) { "
" C[i] = A[i] + B[i]; "
" } "
" } ";
int main()
{
cl_platform_id platform;
cl_device_id device;
cl_context context;
cl_command_queue commandQueue;
cl_kernel vectorAddKernel;
cl_program program;
cl_int err;
cl_mem bufferA, bufferB, bufferC;
TracyCLCtx tracyCLCtx;
{
ZoneScopedN("OpenCL Init");
cl_uint numPlatforms = 0;
CL_ASSERT(clGetPlatformIDs(0, nullptr, &numPlatforms));
if (numPlatforms == 0)
{
std::cerr << "Cannot find OpenCL platform to run this application" << std::endl;
return 1;
}
CL_ASSERT(clGetPlatformIDs(1, &platform, nullptr));
size_t platformNameBufferSize = 0;
CL_ASSERT(clGetPlatformInfo(platform, CL_PLATFORM_NAME, 0, nullptr, &platformNameBufferSize));
std::string platformName(platformNameBufferSize, '\0');
CL_ASSERT(clGetPlatformInfo(platform, CL_PLATFORM_NAME, platformNameBufferSize, &platformName[0], nullptr));
std::cout << "OpenCL Platform: " << platformName << std::endl;
CL_ASSERT(clGetDeviceIDs(platform, CL_DEVICE_TYPE_ALL, 1, &device, nullptr));
size_t deviceNameBufferSize = 0;
CL_ASSERT(clGetDeviceInfo(device, CL_DEVICE_NAME, 0, nullptr, &deviceNameBufferSize));
std::string deviceName(deviceNameBufferSize, '\0');
CL_ASSERT(clGetDeviceInfo(device, CL_DEVICE_NAME, deviceNameBufferSize, &deviceName[0], nullptr));
std::cout << "OpenCL Device: " << deviceName << std::endl;
err = CL_SUCCESS;
context = clCreateContext(nullptr, 1, &device, nullptr, nullptr, &err);
CL_ASSERT(err);
size_t kernelSourceLength = sizeof(kernelSource);
const char* kernelSourceArray = { kernelSource };
program = clCreateProgramWithSource(context, 1, &kernelSourceArray, &kernelSourceLength, &err);
CL_ASSERT(err);
if (clBuildProgram(program, 1, &device, nullptr, nullptr, nullptr) != CL_SUCCESS)
{
size_t programBuildLogBufferSize = 0;
CL_ASSERT(clGetProgramBuildInfo(program, device, CL_PROGRAM_BUILD_LOG, 0, nullptr, &programBuildLogBufferSize));
std::string programBuildLog(programBuildLogBufferSize, '\0');
CL_ASSERT(clGetProgramBuildInfo(program, device, CL_PROGRAM_BUILD_LOG, programBuildLogBufferSize, &programBuildLog[0], nullptr));
std::clog << programBuildLog << std::endl;
return 1;
}
vectorAddKernel = clCreateKernel(program, "vectorAdd", &err);
CL_ASSERT(err);
commandQueue = clCreateCommandQueue(context, device, CL_QUEUE_PROFILING_ENABLE, &err);
CL_ASSERT(err);
}
tracyCLCtx = TracyCLContext(context, device);
size_t N = 10 * 1024 * 1024 / sizeof(float); // 10MB of floats
std::vector<float> hostA, hostB, hostC;
{
ZoneScopedN("Host Data Init");
hostA.resize(N);
hostB.resize(N);
hostC.resize(N);
std::iota(std::begin(hostA), std::end(hostA), 0.0f);
std::iota(std::begin(hostB), std::end(hostB), 0.0f);
}
{
ZoneScopedN("Host to Device Memory Copy");
bufferA = clCreateBuffer(context, CL_MEM_READ_WRITE, N * sizeof(float), nullptr, &err);
CL_ASSERT(err);
bufferB = clCreateBuffer(context, CL_MEM_READ_WRITE, N * sizeof(float), nullptr, &err);
CL_ASSERT(err);
bufferC = clCreateBuffer(context, CL_MEM_READ_WRITE, N * sizeof(float), nullptr, &err);
CL_ASSERT(err);
cl_event writeBufferAEvent, writeBufferBEvent;
{
ZoneScopedN("Write Buffer A");
TracyCLZoneS(tracyCLCtx, "Write BufferA", 5);
CL_ASSERT(clEnqueueWriteBuffer(commandQueue, bufferA, CL_FALSE, 0, N * sizeof(float), hostA.data(), 0, nullptr, &writeBufferAEvent));
TracyCLZoneSetEvent(writeBufferAEvent);
}
{
ZoneScopedN("Write Buffer B");
TracyCLZone(tracyCLCtx, "Write BufferB");
CL_ASSERT(clEnqueueWriteBuffer(commandQueue, bufferB, CL_FALSE, 0, N * sizeof(float), hostB.data(), 0, nullptr, &writeBufferBEvent));
TracyCLZoneSetEvent(writeBufferBEvent);
}
}
const int numLaunchs = 100;
std::vector<cl_event> kernelLaunchEvts;
kernelLaunchEvts.reserve(numLaunchs);
for (int i = 0; i < numLaunchs; ++i)
{
int n_value = static_cast<int>(N);
ZoneScopedN("VectorAdd Kernel Launch");
TracyCLZoneC(tracyCLCtx, "VectorAdd Kernel", tracy::Color::Blue4);
CL_ASSERT(clSetKernelArg(vectorAddKernel, 0, sizeof(cl_mem), &bufferC));
CL_ASSERT(clSetKernelArg(vectorAddKernel, 1, sizeof(cl_mem), &bufferA));
CL_ASSERT(clSetKernelArg(vectorAddKernel, 2, sizeof(cl_mem), &bufferB));
CL_ASSERT(clSetKernelArg(vectorAddKernel, 3, sizeof(int), &n_value));
cl_event vectorAddKernelEvent;
CL_ASSERT(clEnqueueNDRangeKernel(commandQueue, vectorAddKernel, 1, nullptr, &N, nullptr, 0, nullptr, &vectorAddKernelEvent));
TracyCLZoneSetEvent(vectorAddKernelEvent);
CL_ASSERT(clRetainEvent(vectorAddKernelEvent));
kernelLaunchEvts.push_back(vectorAddKernelEvent);
std::cout << "VectorAdd Kernel Enqueued" << std::endl;
}
{
ZoneScopedN("Device to Host Memory Copy");
TracyCLZone(tracyCLCtx, "Read Buffer C");
cl_event readbufferCEvent;
CL_ASSERT(clEnqueueReadBuffer(commandQueue, bufferC, CL_TRUE, 0, N * sizeof(float), hostC.data(), 0, nullptr, &readbufferCEvent));
TracyCLZoneSetEvent(readbufferCEvent);
}
CL_ASSERT(clFinish(commandQueue));
std::vector<float> durations(kernelLaunchEvts.size());
for (int i=0; i<kernelLaunchEvts.size(); i++) {
cl_event evt = kernelLaunchEvts[i];
cl_ulong start;
cl_ulong end;
CL_ASSERT(clGetEventProfilingInfo(evt, CL_PROFILING_COMMAND_START, sizeof(cl_ulong), &start, nullptr));
CL_ASSERT(clGetEventProfilingInfo(evt, CL_PROFILING_COMMAND_END, sizeof(cl_ulong), &end, nullptr));
CL_ASSERT(clReleaseEvent(evt));
durations[i] = (end - start) * 0.001f;
std::cout << "VectorAdd Kernel " << i << " tooks " << static_cast<int>(durations[i]) << "us" << std::endl;
};
float avg = std::accumulate(durations.cbegin(), durations.cend(), 0.0f) / durations.size();
float stddev2 = std::accumulate(durations.cbegin(), durations.cend(), 0.0f, [avg](const float& acc, const float& v) {
auto d = v - avg;
return acc + d*d;
}) / (durations.size() - 1.0f);
std::cout << "VectorAdd runtime avg: " << avg << "us, std: " << sqrt(stddev2) << "us over " << numLaunchs << " runs." << std::endl;
TracyCLCollect(tracyCLCtx);
{
ZoneScopedN("Checking results");
for (int i = 0; i < N; ++i)
{
assert(hostC[i] == hostA[i] + hostB[i]);
}
}
std::cout << "Results are correct!" << std::endl;
TracyCLDestroy(tracyCLCtx);
return 0;
}
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