virtual int2 split_kernel_global_size(device_memory& kg, device_memory& data, DeviceTask * /*task*/)
{
cl_device_type type = OpenCLInfo::get_device_type(device->cdDevice);
/* Use small global size on CPU devices as it seems to be much faster. */
if(type == CL_DEVICE_TYPE_CPU) {
VLOG(1) << "Global size: (64, 64).";
return make_int2(64, 64);
}
cl_ulong max_buffer_size;
clGetDeviceInfo(device->cdDevice, CL_DEVICE_MAX_MEM_ALLOC_SIZE, sizeof(cl_ulong), &max_buffer_size, NULL);
if(DebugFlags().opencl.mem_limit) {
max_buffer_size = min(max_buffer_size,
cl_ulong(DebugFlags().opencl.mem_limit - device->stats.mem_used));
}
VLOG(1) << "Maximum device allocation size: "
<< string_human_readable_number(max_buffer_size) << " bytes. ("
<< string_human_readable_size(max_buffer_size) << ").";
/* Limit to 2gb, as we shouldn't need more than that and some devices may support much more. */
max_buffer_size = min(max_buffer_size / 2, (cl_ulong)2l*1024*1024*1024);
size_t num_elements = max_elements_for_max_buffer_size(kg, data, max_buffer_size);
int2 global_size = make_int2(max(round_down((int)sqrt(num_elements), 64), 64), (int)sqrt(num_elements));
VLOG(1) << "Global size: " << global_size << ".";
return global_size;
}
virtual int2 split_kernel_global_size(device_memory& kg, device_memory& data, DeviceTask * /*task*/)
{
cl_device_type type = OpenCLInfo::get_device_type(device->cdDevice);
/* Use small global size on CPU devices as it seems to be much faster. */
if(type == CL_DEVICE_TYPE_CPU) {
VLOG(1) << "Global size: (64, 64).";
return make_int2(64, 64);
}
cl_ulong max_buffer_size;
clGetDeviceInfo(device->cdDevice, CL_DEVICE_MAX_MEM_ALLOC_SIZE, sizeof(cl_ulong), &max_buffer_size, NULL);
VLOG(1) << "Maximum device allocation size: "
<< string_human_readable_number(max_buffer_size) << " bytes. ("
<< string_human_readable_size(max_buffer_size) << ").";
size_t num_elements = max_elements_for_max_buffer_size(kg, data, max_buffer_size / 2);
int2 global_size = make_int2(round_down((int)sqrt(num_elements), 64), (int)sqrt(num_elements));
VLOG(1) << "Global size: " << global_size << ".";
return global_size;
}
