/// <summary>
/// Allocated a GPU managed buffer.
/// Code based on https://www.codeproject.com/Articles/32125/Unmanaged-Arrays-in-C-No-Problem
/// </summary>
public IntPtr New(int bytes)
{
if (false)
{
// Let's try allocating a block of memory on the host. cuMemHostAlloc allocates bytesize
// bytes of host memory that is page-locked and accessible to the device.
// Note: cuMemHostAlloc and cuMemAllocHost seem to be almost identical except for the
// third parameter to cuMemHostAlloc that is used for the type of memory allocation.
var res = Cuda.cuMemHostAlloc(out IntPtr p, 10, (uint)Cuda.CU_MEMHOSTALLOC_DEVICEMAP);
if (res == CUresult.CUDA_SUCCESS)
{
System.Console.WriteLine("Worked.");
}
else
{
System.Console.WriteLine("Did not work.");
}
}
if (false)
{
// Allocate CPU memory, pin it, then register it with GPU.
int f = new int();
GCHandle handle = GCHandle.Alloc(f, GCHandleType.Pinned);
IntPtr pointer = (IntPtr)handle;
var size = Marshal.SizeOf(f);
var res = Cuda.cuMemHostRegister_v2(pointer, (uint)size, (uint)Cuda.CU_MEMHOSTALLOC_DEVICEMAP);
if (res == CUresult.CUDA_SUCCESS)
{
System.Console.WriteLine("Worked.");
}
else
{
System.Console.WriteLine("Did not work.");
}
}
{
// Allocate Unified Memory.
var size = bytes;
var res = Cuda.cuMemAllocManaged(out IntPtr pointer, (uint)size, (uint)Swigged.Cuda.CUmemAttach_flags.CU_MEM_ATTACH_GLOBAL);
if (res != CUresult.CUDA_SUCCESS)
{
throw new Exception("cuMemAllocManged failed.");
}
return(pointer);
}
if (false)
{
return(Marshal.AllocHGlobal(bytes));
}
}