50 lines
1.4 KiB
Markdown
50 lines
1.4 KiB
Markdown
---
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tags: []
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date created: 星期四, 十一月 20日 2025, 8:52:43 晚上
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date modified: 星期日, 十二月 7日 2025, 9:26:50 晚上
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---
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流的设计模式：B. 多流乒乓/多缓冲 (Multi-Stream Ping-Pong) (推荐)
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但是 先设计 A. 单流串行 (Serial Stream) 作为代码调试阶段的轻量级。
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1. 缓冲区管理状态机
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```mermaid
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stateDiagram-v2
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%% 状态定义
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state "HOST_OWNED<br/>(主机所有)" as HOST
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state "DEVICE_OWNED_H2D<br/>(传输中: H->D)" as H2D
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state "DEVICE_OWNED_COMPUTE<br/>(计算中: Kernel)" as COMPUTE
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state "DEVICE_OWNED_D2H<br/>(传输中: D->H)" as D2H
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state "RELEASED<br/>(待归还)" as RELEASED
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%% 流程流转
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[*] --> HOST : 从 MemoryPool 申请
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HOST --> H2D : I/O线程填充数据\n并调用 cudaMemcpyAsync
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note right of HOST
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此时数据位于页锁定内存
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CPU 写入完成
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end note
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H2D --> COMPUTE : 记录 H2D_Event\nStreamWaitEvent
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note right of H2D
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DMA 引擎正在搬运
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CPU 不阻塞
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end note
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COMPUTE --> D2H : Kernel 执行完毕\n自动触发 D2H
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note right of COMPUTE
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GPU 核心正在计算
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数据驻留显存
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end note
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D2H --> RELEASED : D2H 完成回调\n或 Event 同步
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note right of D2H
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结果已写回 Host
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end note
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RELEASED --> HOST : DataPacket 析构\n自动归还 Pool
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RELEASED --> [*]
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```
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