Question

我编写了以下C ++代码。在clSetKernelArg( kernel, 8, sizeof( cl_mem ), (void *) &mob_whdis );，它返回error code -49，我不明白为什么。其他一切都正常运行。任何人都可以帮助我吗？

cl_mem mob_X = NULL;
cl_mem mob_Y = NULL;
cl_mem mob_Z = NULL;
cl_mem mob_WAT = NULL;
cl_mem mob_POL = NULL;
cl_mem mob_FSW = NULL;
cl_mem mob_nop = NULL;
cl_mem mob_nofsw = NULL;
cl_mem mob_whdis = NULL;
cl_mem mob_watwp = NULL;
cl_mem mob_watp = NULL;
cl_mem mob_distp = NULL;
cl_mem mob_watww = NULL;
cl_mem mob_watw = NULL;
cl_mem mob_distw = NULL;
cl_program program = NULL;
cl_kernel kernel = NULL;
cl_uint ret_num_devices;
cl_uint ret_num_platforms;
cl_int err;
float whdis=3.5;
mob_X = clCreateBuffer( context, CL_MEM_READ_WRITE, na * sizeof(float), NULL, &err );
mob_Y = clCreateBuffer( context, CL_MEM_READ_WRITE, na * sizeof(float), NULL, &err );
mob_Z = clCreateBuffer( context, CL_MEM_READ_WRITE, na * sizeof(float), NULL, &err );
mob_WAT = clCreateBuffer( context, CL_MEM_READ_WRITE, now * sizeof(int), NULL, &err );
mob_POL = clCreateBuffer( context, CL_MEM_READ_WRITE, nop * sizeof(int), NULL, &err );
mob_FSW = clCreateBuffer( context, CL_MEM_READ_WRITE, now * sizeof(int), NULL, &err );
mob_nop = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(int), NULL, &err );
mob_nofsw = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(int), NULL, &err );
mob_whdis =  clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(float), NULL, &err );
mob_watwp = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(int) * now * 40, NULL, &err );
mob_watp = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(int) * now * 40, NULL, &err );
mob_distp = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(float) * now * 40, NULL, &err );
mob_watww = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(int) * now * 40, NULL, &err );
mob_watw = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(int) * now * 40, NULL, &err );
mob_distw = clCreateBuffer( context, CL_MEM_READ_WRITE, sizeof(float) * now * 40, NULL, &err );
err = clEnqueueWriteBuffer( command_queue, mob_X, CL_TRUE, 0, na * sizeof(float), X, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_Y, CL_TRUE, 0, na * sizeof(float), Y, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_Z, CL_TRUE, 0, na * sizeof(float), Z, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_WAT, CL_TRUE, 0, now * sizeof(int), wat, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_POL, CL_TRUE, 0, nop * sizeof(int), pol, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_FSW, CL_TRUE, 0, now * sizeof(int), fsw, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_nop, CL_TRUE, 0, sizeof(int), &nop, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_nofsw, CL_TRUE, 0, sizeof(int), &nofsw, 0, NULL, NULL );
err = clEnqueueWriteBuffer( command_queue, mob_whdis, CL_TRUE, 0, sizeof(float), &whdis, 0, NULL, NULL );
err_check( err, "clSetKernelArg" );
err = clSetKernelArg( kernel, 0, sizeof( cl_mem ), (void *) &mob_X );
err = clSetKernelArg( kernel, 1, sizeof( cl_mem ), (void *) &mob_Y );
err = clSetKernelArg( kernel, 2, sizeof( cl_mem ), (void *) &mob_Z );
err = clSetKernelArg( kernel, 3, sizeof( cl_mem ), (void *) &mob_WAT );
err = clSetKernelArg( kernel, 4, sizeof( cl_mem ), (void *) &mob_POL );
err = clSetKernelArg( kernel, 5, sizeof( cl_mem ), (void *) &mob_FSW );
err = clSetKernelArg( kernel, 6, sizeof( cl_mem ), (void *) &mob_nop );
err = clSetKernelArg( kernel, 7, sizeof( cl_mem ), (void *) &mob_nofsw );
err = clSetKernelArg( kernel, 8, sizeof( cl_mem ), (void *) &mob_whdis );

    // Step 11: Execute OpenCL kernel in data parallel
size_t worksize[] = { now, 1, 1 };
clEnqueueNDRangeKernel( command_queue, kernel, 1, NULL, worksize, 0, 0, 0, 0 );
err_check( err, "clEnqueueNDRangeKernel" );
// Step 12: Read (Transfer result) from the memory buffer

Answer 1

错误-49是CL_INVALID_ARG_INDEX。您应该检查您的opencl内核源参数。

此外，在您的代码中，您应clCreateProgramWithSource使用程序的OpenCL源代码clBuildProgram进行编译和链接，然后使用clCreateKernel获取有效的内核引用。然后您可以正确使用clSetKernelArg。

Answer 2

只是一个快速的反问题：

mob_whdis是sizeof（float）的设备缓冲区。这意味着全局内存中有一个浮点值。全局内存在读写时有很大的性能影响。您可以改为使用私有const，例如：

float mob_whdis = 0.0f; ... SetKernalArg（kernel，8，sizeof（float），＆amp; mob_whdis）;

这会在私有内存中的所有内核中放置一个浮点常量，这个内核非常快，比Global快得多。

同样适用于mob_nofsw和mob_nop。

clSetKernelArg返回错误代码-49

2 个答案: