我找到了这个opencl示例代码：
/*
* Simple OpenCL demo program
*
* Copyright (C) 2009 Clifford Wolf <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* gcc -o cldemo -std=gnu99 -Wall -I/usr/include/nvidia-current cldemo.c -lOpenCL
*
*/
#pragma OPENCL EXTENSION cl_khr_icd : enable
#include <ocl_icd.h>
#include <CL/cl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define NUM_DATA 100
#define CL_CHECK(_expr) \
do { \
cl_int _err = _expr; \
if (_err == CL_SUCCESS) \
break; \
fprintf(stderr, "OpenCL Error: '%s' returned %d!\n", #_expr, (int)_err); \
abort(); \
} while (0)
#define CL_CHECK_ERR(_expr) \
({ \
cl_int _err = CL_INVALID_VALUE; \
typeof(_expr) _ret = _expr; \
if (_err != CL_SUCCESS) { \
fprintf(stderr, "OpenCL Error: '%s' returned %d!\n", #_expr, (int)_err); \
abort(); \
} \
_ret; \
})
void pfn_notify(const char *errinfo, const void *private_info, size_t cb, void *user_data)
{
fprintf(stderr, "OpenCL Error (via pfn_notify): %s\n", errinfo);
}
int main(int argc, char **argv)
{
cl_platform_id platforms[100];
cl_uint platforms_n = 0;
//CL_CHECK(clIcdGetPlatformIDsKHR(100, platforms, &platforms_n));
CL_CHECK(clGetPlatformIDs(100, platforms, &platforms_n));
printf("=== %d OpenCL platform(s) found: ===\n", platforms_n);
for (int i=0; i<platforms_n; i++)
{
char buffer[10240];
printf(" -- %d --\n", i);
CL_CHECK(clGetPlatformInfo(platforms[i], CL_PLATFORM_PROFILE, 10240, buffer, NULL));
printf(" PROFILE = %s\n", buffer);
CL_CHECK(clGetPlatformInfo(platforms[i], CL_PLATFORM_VERSION, 10240, buffer, NULL));
printf(" VERSION = %s\n", buffer);
CL_CHECK(clGetPlatformInfo(platforms[i], CL_PLATFORM_NAME, 10240, buffer, NULL));
printf(" NAME = %s\n", buffer);
CL_CHECK(clGetPlatformInfo(platforms[i], CL_PLATFORM_VENDOR, 10240, buffer, NULL));
printf(" VENDOR = %s\n", buffer);
CL_CHECK(clGetPlatformInfo(platforms[i], CL_PLATFORM_EXTENSIONS, 10240, buffer, NULL));
printf(" EXTENSIONS = %s\n", buffer);
}
if (platforms_n == 0)
return 1;
cl_device_id devices[100];
cl_uint devices_n = 0;
// CL_CHECK(clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, 100, devices, &devices_n));
CL_CHECK(clGetDeviceIDs(platforms[0], CL_DEVICE_TYPE_GPU, 100, devices, &devices_n));
printf("=== %d OpenCL device(s) found on platform:\n", platforms_n);
for (int i=0; i<devices_n; i++)
{
char buffer[10240];
cl_uint buf_uint;
cl_ulong buf_ulong;
printf(" -- %d --\n", i);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DEVICE_NAME, sizeof(buffer), buffer, NULL));
printf(" DEVICE_NAME = %s\n", buffer);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DEVICE_VENDOR, sizeof(buffer), buffer, NULL));
printf(" DEVICE_VENDOR = %s\n", buffer);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DEVICE_VERSION, sizeof(buffer), buffer, NULL));
printf(" DEVICE_VERSION = %s\n", buffer);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DRIVER_VERSION, sizeof(buffer), buffer, NULL));
printf(" DRIVER_VERSION = %s\n", buffer);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DEVICE_MAX_COMPUTE_UNITS, sizeof(buf_uint), &buf_uint, NULL));
printf(" DEVICE_MAX_COMPUTE_UNITS = %u\n", (unsigned int)buf_uint);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DEVICE_MAX_CLOCK_FREQUENCY, sizeof(buf_uint), &buf_uint, NULL));
printf(" DEVICE_MAX_CLOCK_FREQUENCY = %u\n", (unsigned int)buf_uint);
CL_CHECK(clGetDeviceInfo(devices[i], CL_DEVICE_GLOBAL_MEM_SIZE, sizeof(buf_ulong), &buf_ulong, NULL));
printf(" DEVICE_GLOBAL_MEM_SIZE = %llu\n", (unsigned long long)buf_ulong);
}
if (devices_n == 0)
return 1;
cl_context context;
context = CL_CHECK_ERR(clCreateContext(NULL, 1, devices, &pfn_notify, NULL, &_err));
const char *program_source[] = {
"__kernel void simple_demo(__global int *src, __global int *dst, int factor)\n",
"{\n",
"int i = get_global_id(0);\n",
"dst[i] = src[i] * factor;\n",
"}\n"
};
cl_program program;
program = CL_CHECK_ERR(clCreateProgramWithSource(context, sizeof(program_source)/sizeof(*program_source), program_source, NULL, &_err));
if (clBuildProgram(program, 1, devices, "", NULL, NULL) != CL_SUCCESS) {
char buffer[10240];
clGetProgramBuildInfo(program, devices[0], CL_PROGRAM_BUILD_LOG, sizeof(buffer), buffer, NULL);
fprintf(stderr, "CL Compilation failed:\n%s", buffer);
abort();
}
CL_CHECK(clUnloadCompiler());
cl_mem input_buffer;
input_buffer = CL_CHECK_ERR(clCreateBuffer(context, CL_MEM_READ_ONLY, sizeof(int)*NUM_DATA, NULL, &_err));
cl_mem output_buffer;
output_buffer = CL_CHECK_ERR(clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(int)*NUM_DATA, NULL, &_err));
int factor = 2;
cl_kernel kernel;
kernel = CL_CHECK_ERR(clCreateKernel(program, "simple_demo", &_err));
CL_CHECK(clSetKernelArg(kernel, 0, sizeof(input_buffer), &input_buffer));
CL_CHECK(clSetKernelArg(kernel, 1, sizeof(output_buffer), &output_buffer));
CL_CHECK(clSetKernelArg(kernel, 2, sizeof(factor), &factor));
cl_command_queue queue;
queue = CL_CHECK_ERR(clCreateCommandQueue(context, devices[0], 0, &_err));
for (int i=0; i<NUM_DATA; i++) {
CL_CHECK(clEnqueueWriteBuffer(queue, input_buffer, CL_TRUE, i*sizeof(int), sizeof(int), &i, 0, NULL, NULL));
}
cl_event kernel_completion;
size_t global_work_size[1] = { NUM_DATA };
CL_CHECK(clEnqueueNDRangeKernel(queue, kernel, 1, NULL, global_work_size, NULL, 0, NULL, &kernel_completion));
CL_CHECK(clWaitForEvents(1, &kernel_completion));
CL_CHECK(clReleaseEvent(kernel_completion));
printf("Result:");
for (int i=0; i<NUM_DATA; i++) {
int data;
CL_CHECK(clEnqueueReadBuffer(queue, output_buffer, CL_TRUE, i*sizeof(int), sizeof(int), &data, 0, NULL, NULL));
printf(" %d", data);
}
printf("\n");
CL_CHECK(clReleaseMemObject(input_buffer));
CL_CHECK(clReleaseMemObject(output_buffer));
CL_CHECK(clReleaseKernel(kernel));
CL_CHECK(clReleaseProgram(program));
CL_CHECK(clReleaseContext(context));
return 0;
}
它适用于AMD gpu。但是当我安装beignet时，为了尝试intel集成的gpu，我得到了这个结果：
=== 2 OpenCL platform(s) found: ===
-- 0 --
PROFILE = FULL_PROFILE
VERSION = OpenCL 1.1
NAME = Experiment Intel Gen OCL Driver
VENDOR = Intel
EXTENSIONS = cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_fp64 cl_khr_icd cl_khr_gl_sharing
-- 1 --
PROFILE = FULL_PROFILE
VERSION = OpenCL 1.2 AMD-APP (1214.3)
NAME = AMD Accelerated Parallel Processing
VENDOR = Advanced Micro Devices, Inc.
EXTENSIONS = cl_khr_icd cl_amd_event_callback cl_amd_offline_devices
X server found. dri2 connection failed!
Trying to open directly...Device open failed
怎么了？
Beignet version: 0.2-2 fglrx version: 2:13.101-0ubuntu3 sys: amd64_linux26 uname -a: Linux BetoNIX2 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux lscpu: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 2 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 58 Stepping: 9 CPU MHz: 2501.000 BogoMIPS: 4988.50 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 3072K NUMA node0 CPU(s): 0-3
答案 0 :(得分：5)
同样的问题发生在我身上。然后我认为/dev/dri/card*访问仅适用于用户root和视频组。您可以在可执行文件之前使用sudo运行应用程序。祝你好运！
旁注：我将自己加入了视频群组，但它也没有用。但在可执行文件之前，sudo命令始终正常工作。
答案 1 :(得分：0)
尝试使用beignet的最后一个版本并编译它：https://01.org/beignet/downloads如果您正确设置了Makefile，它应该适合您。