我正在GeForce GT 610上运行我的OpenCL程序。我知道CUDA可能是更好的选择,但现在为了能够在AMD显卡上运行,我正在使用OpenCL编写代码。在初始化期间,我会选择一个设备来运行程序。以下是该阶段程序输出的内容:
我的问题是为什么它说最大计算单元只有1个?根据GeForce网站上的规格细节,它有48个CUDA核心。我知道CUDA在Nvidia卡上运行得更好,但它真的会限制这么多吗?Nvidia将OpenCL限制为总功率的1/48吗?
这是我的代码打印出来的样子:
OpenCL Platform 0: NVIDIA CUDA
----- OpenCL Device # 0: GeForce GT 610-----
Gflops: 1.620000
Max Compute Units: 1
Max Clock Frequency: 1620
Total Memory of Device (bytes): 1072889856
Max Size of Memory Object Allocation (bytes): 268222464
Max Work Group Size: 1024
我的问题是为什么它说最大计算单元只有1个?根据GeForce网站上的规格细节,它有48个CUDA核心。我知道CUDA在Nvidia卡上运行得更好,但它真的会限制这么多吗?Nvidia将OpenCL限制为总功率的1/48吗?
这是我的代码打印出来的样子:
if (clGetPlatformInfo(platforms[platform], CL_PLATFORM_NAME, sizeof(name), name, NULL)) Fatal("Cannot get OpenCL platform name\n");
if (verbose) printf("OpenCL Platform %d: %s\n", platform, name);
...循环内部...
cl_uint compUnits, freq;
cl_ulong memSize, maxAlloc;
size_t maxWorkGrps;
if (clGetDeviceInfo(id[devId], CL_DEVICE_MAX_COMPUTE_UNITS, sizeof(compUnits), &compUnits, NULL)) Fatal("Cannot get OpenCL device units\n");
if (clGetDeviceInfo(id[devId], CL_DEVICE_MAX_CLOCK_FREQUENCY, sizeof(freq), &freq, NULL)) Fatal("Cannot get OpenCL device frequency\n");
if (clGetDeviceInfo(id[devId], CL_DEVICE_NAME, sizeof(name), name, NULL)) Fatal("Cannot get OpenCL device name\n");
if (clGetDeviceInfo(id[devId], CL_DEVICE_GLOBAL_MEM_SIZE, sizeof(memSize), &memSize, NULL)) Fatal("Cannot get OpenCL memory size.\n");
if (clGetDeviceInfo(id[devId], CL_DEVICE_MAX_MEM_ALLOC_SIZE, sizeof(memSize), &maxAlloc, NULL)) Fatal("Cannot get OpenCL memory size.\n");
if (clGetDeviceInfo(id[devId], CL_DEVICE_MAX_WORK_GROUP_SIZE, sizeof(maxWorkGrps), &maxWorkGrps, NULL)) Fatal("Cannot get OpenCL max work group size\n");
int Gflops = compUnits * freq;
if (verbose) printf(" ----- OpenCL Device # %d: %s-----\n"
"Gflops: %f\n"
"Max Compute Units: %d\n"
"Max Clock Frequency: %d\n"
"Total Memory of Device (bytes): %lu\n"
"Max Size of Memory Object Allocation (bytes): %lu\n"
"Max Work Group Size: %d\n",
devId,
name,
1e-3*Gflops,
compUnits,
freq,
memSize,
maxAlloc,
maxWorkGrps);