Unity memory mapped file to native array, to directly read write to disk file from gpu buffer.cs

public class MMFNativeArray<T> where T : struct
{
    MemoryMappedFile mmf;
    MemoryMappedViewAccessor accessor;
    public NativeArray<T> native;

    public MMFNativeArray(string path, FileMode mode, string mapName, int bytes)
    {
        unsafe
        {
            mmf = MemoryMappedFile.CreateFromFile(path, mode, mapName, bytes);
            //Note that if you call CreateViewAccessor with offset you must add that offset to the pointer from AcquirePointer. AcquirePointer refers to the beginning of the file regardless of the offset in CreateViewAccessor.
            accessor = mmf.CreateViewAccessor(0, bytes);
            byte* ptr = null;
            accessor.SafeMemoryMappedViewHandle.AcquirePointer(ref ptr);
            native = NativeArrayUnsafeUtility.ConvertExistingDataToNativeArray<T>(ptr, bytes / UnsafeUtility.SizeOf<T>(), Allocator.None);
            NativeArrayUnsafeUtility.SetAtomicSafetyHandle(ref native, AtomicSafetyHandle.Create());
        }
    }

    public void Dispose()
    {
        native.Dispose();
        accessor.SafeMemoryMappedViewHandle.ReleasePointer();
        accessor.Dispose();
        mmf.Dispose();
    }
}

//usage:
//directly saves from gpu to file
AsyncGPUReadback.RequestIntoNativeArray(ref mmf.native, computeBuffer);

//directly loads from file to gpu
computeBuffer.SetData(mmf.native);