Esempio n. 1
0
func (this *buffer) EnqueueMap(queue CommandQueue,
	blocking_map cl.CL_bool,
	map_flags cl.CL_map_flags,
	offset cl.CL_size_t,
	cb cl.CL_size_t,
	event_wait_list []Event) (unsafe.Pointer, Event, error) {
	var errCode cl.CL_int
	var event_id cl.CL_event

	numEvents := cl.CL_uint(len(event_wait_list))
	events := make([]cl.CL_event, numEvents)
	for i := cl.CL_uint(0); i < numEvents; i++ {
		events[i] = event_wait_list[i].GetID()
	}

	if mapped_ptr := cl.CLEnqueueMapBuffer(queue.GetID(),
		this.memory_id,
		blocking_map,
		map_flags,
		offset,
		cb,
		numEvents,
		events,
		&event_id,
		&errCode); errCode != cl.CL_SUCCESS {
		return nil, nil, fmt.Errorf("EnqueueMap failure with errcode_ret %d: %s", errCode, cl.ERROR_CODES_STRINGS[-errCode])
	} else {
		return mapped_ptr, &event{event_id}, nil
	}
}
Esempio n. 2
0
func main() {

	/* OpenCL data structures */
	var device []cl.CL_device_id
	var context cl.CL_context
	var queue cl.CL_command_queue
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	/* Data and buffers */
	var data_one, data_two, result_array [100]float32
	var buffer_one, buffer_two cl.CL_mem
	var mapped_memory unsafe.Pointer

	/* Initialize arrays */
	for i := 0; i < 100; i++ {
		data_one[i] = 1.0 * float32(i)
		data_two[i] = -1.0 * float32(i)
		result_array[i] = 0.0
	}

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create the kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, []byte(KERNEL_FUNC), &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create buffers */
	buffer_one = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(data_one)), unsafe.Pointer(&data_one[0]), &err)
	if err < 0 {
		println("Couldn't create buffer object 1")
		return
	}
	buffer_two = cl.CLCreateBuffer(context, cl.CL_MEM_READ_WRITE|
		cl.CL_MEM_COPY_HOST_PTR, cl.CL_size_t(unsafe.Sizeof(data_two)), unsafe.Pointer(&data_two), &err)
	if err < 0 {
		println("Couldn't create buffer object 2")
		return
	}
	/* Set buffers as arguments to the kernel */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(buffer_one)), unsafe.Pointer(&buffer_one))
	err |= cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(buffer_two)), unsafe.Pointer(&buffer_two))
	if err < 0 {
		println("Couldn't set the buffer as the kernel argument")
		return
	}

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	/* Enqueue kernel */
	err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
	if err < 0 {
		println("Couldn't enqueue the kernel")
		return
	}

	/* Enqueue command to copy buffer one to buffer two */
	err = cl.CLEnqueueCopyBuffer(queue, buffer_one, buffer_two, 0, 0,
		cl.CL_size_t(unsafe.Sizeof(data_one)), 0, nil, nil)
	if err < 0 {
		println("Couldn't perform the buffer copy")
		return
	}

	/* Enqueue command to map buffer two to host memory */
	mapped_memory = cl.CLEnqueueMapBuffer(queue, buffer_two, cl.CL_TRUE,
		cl.CL_MAP_READ, 0, cl.CL_size_t(unsafe.Sizeof(data_two)), 0, nil, nil, &err)
	if err < 0 {
		println("Couldn't map the buffer to host memory")
		return
	}

	/* Transfer memory and unmap the buffer */
	C.memcpy(unsafe.Pointer(&result_array[0]), mapped_memory, C.size_t(unsafe.Sizeof(data_two)))
	err = cl.CLEnqueueUnmapMemObject(queue, buffer_two, mapped_memory,
		0, nil, nil)
	if err < 0 {
		println("Couldn't unmap the buffer")
		return
	}

	/* Display updated buffer */
	for i := 0; i < 10; i++ {
		for j := 0; j < 10; j++ {
			fmt.Printf("%6.1f", result_array[j+i*10])
		}
		fmt.Printf("\n")
	}

	/* Deallocate resources */
	cl.CLReleaseMemObject(buffer_one)
	cl.CLReleaseMemObject(buffer_two)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}
Esempio n. 3
0
func main() {

	/* OpenCL data structures */
	var device []cl.CL_device_id
	var context cl.CL_context
	var queue cl.CL_command_queue
	var program *cl.CL_program
	var kernel cl.CL_kernel
	var err cl.CL_int

	/* Data and events */
	var num_vectors cl.CL_int
	var data [NUM_BYTES]byte
	var data_buffer cl.CL_mem
	var prof_event cl.CL_event
	var total_time cl.CL_ulong
	var time_start, time_end interface{}
	var mapped_memory unsafe.Pointer

	/* Create a device and context */
	device = utils.Create_device()
	context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
	if err < 0 {
		println("Couldn't create a context")
		return
	}

	/* Build the program and create a kernel */
	program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
	kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
	if err < 0 {
		println("Couldn't create a kernel")
		return
	}

	/* Create a buffer to hold data */
	data_buffer = cl.CLCreateBuffer(context, cl.CL_MEM_WRITE_ONLY,
		cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_BYTES, nil, &err)
	if err < 0 {
		println("Couldn't create a buffer")
		return
	}

	/* Create kernel argument */
	err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(data_buffer)), unsafe.Pointer(&data_buffer))
	if err < 0 {
		println("Couldn't set a kernel argument")
		return
	}

	/* Tell kernel number of char16 vectors */
	num_vectors = NUM_BYTES / 16
	cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(num_vectors)), unsafe.Pointer(&num_vectors))

	/* Create a command queue */
	queue = cl.CLCreateCommandQueue(context, device[0],
		cl.CL_QUEUE_PROFILING_ENABLE, &err)
	if err < 0 {
		println("Couldn't create a command queue")
		return
	}

	total_time = 0.0
	for i := 0; i < NUM_ITERATIONS; i++ {

		/* Enqueue kernel */
		err = cl.CLEnqueueTask(queue, kernel, 0, nil, nil)
		if err < 0 {
			println("Couldn't enqueue the kernel")
			return
		}

		if PROFILE_READ == 1 {
			/* Read the buffer */
			err = cl.CLEnqueueReadBuffer(queue, data_buffer, cl.CL_TRUE, 0,
				cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_BYTES, unsafe.Pointer(&data[0]), 0, nil, &prof_event)
			if err < 0 {
				println("Couldn't read the buffer")
				return
			}
		} else {
			/* Create memory map */
			mapped_memory = cl.CLEnqueueMapBuffer(queue, data_buffer, cl.CL_TRUE,
				cl.CL_MAP_READ, 0, cl.CL_size_t(unsafe.Sizeof(data[0]))*NUM_BYTES, 0, nil, &prof_event, &err)
			if err < 0 {
				println("Couldn't map the buffer to host memory")
				return
			}
		}

		/* Get profiling information */
		cl.CLGetEventProfilingInfo(prof_event, cl.CL_PROFILING_COMMAND_START,
			cl.CL_size_t(unsafe.Sizeof(total_time)), &time_start, nil)
		cl.CLGetEventProfilingInfo(prof_event, cl.CL_PROFILING_COMMAND_END,
			cl.CL_size_t(unsafe.Sizeof(total_time)), &time_end, nil)
		total_time += time_end.(cl.CL_ulong) - time_start.(cl.CL_ulong)

		if PROFILE_READ == 0 {
			/* Unmap the buffer */
			err = cl.CLEnqueueUnmapMemObject(queue, data_buffer, mapped_memory,
				0, nil, nil)
			if err < 0 {
				println("Couldn't unmap the buffer")
				return
			}
		}
	}

	if PROFILE_READ == 1 {
		fmt.Printf("Average read time: %v\n", total_time/NUM_ITERATIONS)
	} else {
		fmt.Printf("Average map time: %v\n", total_time/NUM_ITERATIONS)
	}

	/* Deallocate resources */
	cl.CLReleaseEvent(prof_event)
	cl.CLReleaseMemObject(data_buffer)
	cl.CLReleaseKernel(kernel)
	cl.CLReleaseCommandQueue(queue)
	cl.CLReleaseProgram(*program)
	cl.CLReleaseContext(context)
}