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Support multiple OpenCL platforms

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Previously, the code only checked the first OpenCL platform and failed
if thet platform didn't have any devices.
This commit is contained in:
Stephen Seo 2023-05-23 22:51:08 +09:00
parent 379fb4cadf
commit c1c271b77e
1 changed files with 42 additions and 16 deletions
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58
src/opencl_handle.cc
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@ -694,34 +694,60 @@ OpenCLContext::OpenCLContext() : context_(nullptr), queue_(nullptr) {
//////////////////// set up cl_context
cl_int err_num;
cl_uint num_platforms;
cl_platform_id first_platform_id;
std::vector<cl_platform_id> platform_ids;
err_num = clGetPlatformIDs(1, &first_platform_id, &num_platforms);
if (err_num != CL_SUCCESS || num_platforms == 0) {
err_num = clGetPlatformIDs(0, nullptr, &num_platforms);
if (err_num != CL_SUCCESS) {
std::cout << "ERROR: OpenCLContext: Failed to query OpenCL platforms"
<< std::endl;
return;
} else if (num_platforms == 0) {
std::cout << "ERROR: OpenCLContext: Failed to find any OpenCL platforms"
<< std::endl;
return;
}
cl_context_properties context_properties[] = {
CL_CONTEXT_PLATFORM,
reinterpret_cast<cl_context_properties>(first_platform_id), 0};
context_ = clCreateContextFromType(context_properties, CL_DEVICE_TYPE_GPU,
nullptr, nullptr, &err_num);
platform_ids.resize(num_platforms);
err_num = clGetPlatformIDs(num_platforms, platform_ids.data(), nullptr);
if (err_num != CL_SUCCESS) {
std::cout << "ERROR: OpenCLContext: Failed to create GPU context, "
<< "trying CPU..." << std::endl;
context_ = clCreateContextFromType(context_properties, CL_DEVICE_TYPE_CPU,
std::cout << "ERROR: OpenCLContext: Failed to get OpenCL platform id(s)"
<< std::endl;
return;
}
bool success = false;
for (auto i = 0; i < num_platforms; ++i) {
cl_context_properties context_properties[] = {
CL_CONTEXT_PLATFORM,
reinterpret_cast<cl_context_properties>(platform_ids[i]), 0};
context_ = clCreateContextFromType(context_properties, CL_DEVICE_TYPE_GPU,
nullptr, nullptr, &err_num);
if (err_num != CL_SUCCESS) {
std::cout << "ERROR: OpenCLContext: Failed to create CPU context"
<< std::endl;
context_ = nullptr;
return;
std::cout << "ERROR: OpenCLContext: Failed to create GPU context, "
<< "trying CPU..." << std::endl;
context_ = clCreateContextFromType(context_properties, CL_DEVICE_TYPE_CPU,
nullptr, nullptr, &err_num);
if (err_num != CL_SUCCESS) {
std::cout << "ERROR: OpenCLContext: Failed to create CPU context"
<< std::endl;
context_ = nullptr;
continue;
} else {
success = true;
break;
}
} else {
success = true;
break;
}
}
if (!success) {
std::cout << "ERROR: OpenCLContext: Failed to find a valid OpenCL context!"
<< std::endl;
}
//////////////////// end set up cl context
//////////////////// set up command queue