int task(cl_context context, cl_device_id device, cl_command_queue queue, void* data_)
{
const TaskData* data = (const TaskData*) data_;
cl_int err;
if (data->points % data->points_per_work_item)
check_error(CLQMC_INVALID_VALUE, "points must be a multiple of points_per_work_item");
if (data->replications % data->replications_per_work_item)
check_error(CLQMC_INVALID_VALUE, "replications must be a multiple of replications_per_work_item");
// Lattice buffer
size_t pointset_size;
// gen_vec is given in common.c
clqmcLatticeRule* pointset = clqmcLatticeRuleCreate(data->points, DIMENSION, gen_vec, &pointset_size, &err);
check_error(err, NULL);
cl_mem pointset_buf = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_HOST_WRITE_ONLY | CL_MEM_COPY_HOST_PTR,
pointset_size, pointset, &err);
check_error(err, "cannot create point set buffer");
// Shifts buffer
clqmc_fptype* shifts = (clqmc_fptype*) malloc(data->replications * DIMENSION * sizeof(clqmc_fptype));
// populate random shifts using a random stream
clrngMrg31k3pStream* stream = clrngMrg31k3pCreateStreams(NULL, 1, NULL, &err);
check_error(err, NULL);
for (cl_uint i = 0; i < data->replications; i++)
for (cl_uint j = 0; j < DIMENSION; j++)
shifts[i * DIMENSION + j] = clrngMrg31k3pRandomU01(stream);
err = clrngMrg31k3pDestroyStreams(stream);
check_error(err, NULL);
cl_mem shifts_buf = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_HOST_WRITE_ONLY | CL_MEM_COPY_HOST_PTR,
data->replications * DIMENSION * sizeof(clqmc_fptype), shifts, &err);
check_error(err, "cannot create shifts buffer");
// Output buffer
size_t points_block_count = data->points / data->points_per_work_item;
cl_mem output_buf = clCreateBuffer(context, CL_MEM_WRITE_ONLY | CL_MEM_HOST_READ_ONLY,
data->replications * points_block_count * sizeof(clqmc_fptype), NULL, &err);
check_error(err, "cannot create output buffer");
// OpenCL kernel
cl_program program = build_program_from_file(context, device,
"client/DocsTutorial/example4_kernel.cl",
NULL);
check_error(err, NULL);
cl_kernel kernel = clCreateKernel(program, "simulateWithRQMC", &err);
check_error(err, "cannot create kernel");
int iarg = 0;
err = clSetKernelArg(kernel, iarg++, sizeof(pointset_buf), &pointset_buf);
err |= clSetKernelArg(kernel, iarg++, sizeof(shifts_buf), &shifts_buf);
err |= clSetKernelArg(kernel, iarg++, sizeof(data->points_per_work_item), &data->points_per_work_item);
err |= clSetKernelArg(kernel, iarg++, sizeof(data->replications), &data->replications);
err |= clSetKernelArg(kernel, iarg++, sizeof(output_buf), &output_buf);
check_error(err, "cannot set kernel arguments");
// Execution
cl_event ev;
size_t global_size = (data->replications / data->replications_per_work_item) * points_block_count;
err = clEnqueueNDRangeKernel(queue, kernel, 1, NULL, &global_size, NULL, 0, NULL, &ev);
check_error(err, "cannot enqueue kernel");
err = clWaitForEvents(1, &ev);
check_error(err, "error waiting for events");
clqmc_fptype* output = (clqmc_fptype*) malloc(data->replications * points_block_count * sizeof(clqmc_fptype));
err = clEnqueueReadBuffer(queue, output_buf, CL_TRUE, 0,
data->replications * points_block_count * sizeof(clqmc_fptype), output, 0, NULL, NULL);
check_error(err, "cannot read output buffer");
printf("\nAdvanced randomized quasi-Monte Carlo integration:\n\n");
err = clqmcLatticeRuleWriteInfo(pointset, stdout);
check_error(err, NULL);
printf("\n");
rqmcReport(data->replications, data->points, points_block_count, output);
// Clean up
clReleaseEvent(ev);
clReleaseMemObject(output_buf);
clReleaseMemObject(pointset_buf);
clReleaseKernel(kernel);
clReleaseProgram(program);
free(output);
err = clqmcLatticeRuleDestroy(pointset);
check_error(err, NULL);
return EXIT_SUCCESS;
}
OPENCL_EXPERIMENTS_EXPORT
cl_int opencl_plugin_create(opencl_plugin *plugin_out)
{
cl_int err = CL_SUCCESS;
opencl_plugin plugin;
cl_int i;
cl_int num_queues = 50;
assert(plugin_out != NULL);
plugin = calloc(1, sizeof(*plugin));
CHECK_ALLOCATION(plugin);
if (get_desired_platform("NVIDIA", &plugin->selected_platform, &err))
goto error;
if (get_gpu_device_id(plugin->selected_platform, &plugin->selected_device,
CL_TRUE, &err))
goto error;
if (create_context(plugin->selected_platform, plugin->selected_device,
&plugin->context, &err))
goto error;
if (build_program_from_file("program.cl", NULL, plugin->context,
plugin->selected_device, &plugin->program, &err))
goto error;
plugin->queue = clCreateCommandQueue(plugin->context, plugin->selected_device, 0, &err);
CHECK_CL_ERROR(err);
plugin->num_queues = num_queues;
plugin->queues = calloc(num_queues, sizeof(cl_command_queue));
CHECK_ALLOCATION(plugin->queues);
for (i = 0; i < num_queues; i++) {
plugin->queues[i] = clCreateCommandQueue(plugin->context, plugin->selected_device, 0, &err);
CHECK_CL_ERROR(err);
}
plugin->voxelize_kernel = clCreateKernel(plugin->program, "voxelize", &err);
CHECK_CL_ERROR(err);
*plugin_out = plugin;
return 0;
error:
if (plugin) {
if (plugin->voxelize_kernel)
clReleaseKernel(plugin->voxelize_kernel);
if (plugin->queue)
clReleaseCommandQueue(plugin->queue);
if (plugin->queues) {
for (i = 0; i < num_queues; i++) {
if (plugin->queues[i])
clReleaseCommandQueue(plugin->queues[i]);
}
free(plugin->queues);
}
if (plugin->context)
clReleaseContext(plugin->context);
free(plugin);
}
return -1;
}