private void InitVendorFeatures()
{
// Check major vendor features
if (CLAPI.GetDeviceInfo(
DeviceId,
CLDeviceInfoType.CL_DEVICE_WARP_SIZE_NV,
out int warpSize) == CLError.CL_SUCCESS)
{
// Nvidia platform
WarpSize = warpSize;
Vendor = CLAcceleratorVendor.Nvidia;
int major = CLAPI.GetDeviceInfo <int>(
DeviceId,
CLDeviceInfoType.CL_DEVICE_COMPUTE_CAPABILITY_MAJOR_NV);
int minor = CLAPI.GetDeviceInfo <int>(
DeviceId,
CLDeviceInfoType.CL_DEVICE_COMPUTE_CAPABILITY_MINOR_NV);
if (major < 7 || major == 7 && minor < 5)
{
MaxNumThreadsPerMultiprocessor *= 2;
}
}
else if (CLAPI.GetDeviceInfo(
DeviceId,
CLDeviceInfoType.CL_DEVICE_WAVEFRONT_WIDTH_AMD,
out int wavefrontSize) == CLError.CL_SUCCESS)
{
// AMD platform
WarpSize = wavefrontSize;
Vendor = CLAcceleratorVendor.AMD;
}
else
{
Vendor = VendorName.Contains(CLAcceleratorVendor.Intel.ToString()) ?
CLAcceleratorVendor.Intel :
CLAcceleratorVendor.Other;
// Compile dummy kernel to resolve additional information
CLException.ThrowIfFailed(CLKernel.LoadKernel(
this,
DummyKernelSource,
out IntPtr programPtr,
out IntPtr kernelPtr));
try
{
// Resolve information
WarpSize = CLAPI.GetKernelWorkGroupInfo <IntPtr>(
kernelPtr,
DeviceId,
CLKernelWorkGroupInfoType.CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE).ToInt32();
}
finally
{
CLException.ThrowIfFailed(
CLAPI.ReleaseKernel(kernelPtr) |
CLAPI.ReleaseProgram(programPtr));
}
}
}
/// <summary cref="Accelerator.EstimateGroupSizeInternal(
/// Kernel, int, int, out int)"/>
protected override int EstimateGroupSizeInternal(
Kernel kernel,
int dynamicSharedMemorySizeInBytes,
int maxGroupSize,
out int minGridSize)
{
if (dynamicSharedMemorySizeInBytes > 0)
{
throw new ArgumentOutOfRangeException(
nameof(dynamicSharedMemorySizeInBytes));
}
if (maxGroupSize < 1)
{
maxGroupSize = MaxNumThreadsPerGroup;
}
var clKernel = kernel as CLKernel;
var workGroupSizeNative = CLAPI.GetKernelWorkGroupInfo <IntPtr>(
clKernel.KernelPtr,
DeviceId,
CLKernelWorkGroupInfoType.CL_KERNEL_WORK_GROUP_SIZE);
int workGroupSize = workGroupSizeNative.ToInt32();
workGroupSize = IntrinsicMath.Min(workGroupSize, maxGroupSize);
minGridSize = IntrinsicMath.DivRoundUp(MaxNumThreads, workGroupSize);
return(workGroupSize);
}
