以下是基于您提供内容的完整示例demo，展示了如何使用gpu-alloc-ash进行完整的GPU内存管理：

use ash::vk;
use gpu_alloc::Config;
use gpu_alloc_ash::AshMemoryDevice;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // 初始化Vulkan实例和设备（简化为示例，实际需要完整初始化）
    let entry = ash::Entry::linked();
    let instance = create_instance(&entry)?;
    let (physical_device, device) = create_device(&instance)?;
    
    // 1. 初始化内存分配器
    let memory_device = AshMemoryDevice::wrap(device.clone());
    let config = Config::i_am_potato(); // 使用默认配置
    let mut allocator = gpu_alloc::GpuAllocator::new(config, memory_device);
    
    // 准备测试数据
    let vertex_data: [f32; 9] = [
        -0.5, -0.5, 0.0,
        0.5, -0.5, 0.0,
        0.0, 0.5, 0.0
    ];
    
    // 2. 创建并填充缓冲区
    let (buffer, allocation) = create_and_fill_buffer(
        &device,
        &mut allocator,
        bytemuck::cast_slice(&vertex_data)
    )?;
    
    // 3. 使用缓冲区（示例中简化）
    println!("成功创建并填充了顶点缓冲区");
    
    // 4. 清理资源
    unsafe {
        device.destroy_buffer(buffer, None);
        allocator.dealloc(allocation);
    }
    
    Ok(())
}

fn create_and_fill_buffer(
    device: &ash::Device,
    allocator: &mut gpu_alloc::GpuAllocator<AshMemoryDevice>,
    data: &[u8],
) -> Result<(vk::Buffer, gpu_alloc::MemoryBlock<AshMemoryDevice>), Box<dyn std::error::Error>> {
    // 创建缓冲区
    let buffer_info = vk::BufferCreateInfo {
        size: data.len() as u64,
        usage: vk::BufferUsageFlags::VERTEX_BUFFER,
        sharing_mode: vk::SharingMode::EXCLUSIVE,
        ..Default::default()
    };
    
    let buffer = unsafe { device.create_buffer(&buffer_info, None)? };
    let requirements = unsafe { device.get_buffer_memory_requirements(buffer) };
    
    // 分配内存
    let allocation = allocator.alloc(
        gpu_alloc::Request {
            size: requirements.size,
            align_mask: requirements.alignment - 1,
            usage: gpu_alloc::UsageFlags::HOST_ACCESS,
            memory_types: requirements.memory_type_bits,
        }
    )?;
    
    // 绑定内存到缓冲区
    unsafe {
        device.bind_buffer_memory(buffer, allocation.memory(), allocation.offset())?;
    }
    
    // 映射并填充数据
    if allocation.is_host_visible() {
        let mapped_ptr = allocator.map_memory(&allocation)?;
        unsafe {
            std::ptr::copy_nonoverlapping(
                data.as_ptr(),
                mapped_ptr.cast(),
                data.len()
            );
        }
        allocator.unmap_memory(&allocation);
    }
    
    Ok((buffer, allocation))
}

// 简化的Vulkan实例和设备创建函数
fn create_instance(entry: &ash::Entry) -> Result<ash::Instance, ash::InstanceError> {
    let app_info = vk::ApplicationInfo {
        api_version: vk::make_api_version(0, 1, 0, 0),
        ..Default::default()
    };
    
    let create_info = vk::InstanceCreateInfo {
        p_application_info: &app_info,
        ..Default::default()
    };
    
    unsafe { entry.create_instance(&create_info, None) }
}

fn create_device(instance: &ash::Instance) -> Result<(vk::PhysicalDevice, ash::Device), ash::DeviceCreationError> {
    let physical_devices = unsafe { instance.enumerate_physical_devices()? };
    let physical_device = physical_devices[0];
    
    let queue_info = [vk::DeviceQueueCreateInfo {
        queue_family_index: 0,
        queue_count: 1,
        p_queue_priorities: &1.0f32,
        ..Default::default()
    }];
    
    let device_create_info = vk::DeviceCreateInfo {
        queue_create_info_count: queue_info.len() as u32,
        p_queue_create_infos: queue_info.as_ptr(),
        ..Default::default()
    };
    
    let device = unsafe { instance.create_device(physical_device, &device_create_info, None)? };
    
    Ok((physical_device, device))
}

这个完整示例展示了：

1. 初始化Vulkan环境和gpu-alloc-ash分配器
2. 创建顶点缓冲区并分配GPU内存
3. 映射内存并填充顶点数据
4. 清理资源的完整流程

实际使用时需要注意：

• 需要添加更多错误处理
• 需要根据实际需求选择合适的内存类型
• 对于频繁创建/销毁的对象考虑使用内存池
• 大内存分配使用专用分配策略

Cargo.toml需要包含以下依赖：

[dependencies]
ash = "0.37"
gpu-alloc-ash = "0.6"
gpu-alloc = "0.6"
bytemuck = "1.0"