---
title: 执行h2d、d2h偶现不达标-昇腾社区
description: (待补充)
keywords: MindCluster ToolBox;带宽测试;Ascend DMI
url: https://www.hiascend.com/document/caselibrary/detail/toolboxcase_0059
section: (其他)
---

# 执行h2d、d2h偶现不达标-昇腾社区

URL: https://www.hiascend.com/document/caselibrary/detail/toolboxcase_0059
描述: (待补充)
关键词: MindCluster ToolBox;带宽测试;Ascend DMI

昇腾文档 [了解详情](https://www.hiascend.com/document)

故障案例 [了解详情](https://www.hiascend.com/document/caselibrary)

执行h2d、d2h偶现不达标

执行h2d、d2h偶现不达标

2025/01/13

924

问题信息

| 问题来源 | 产品大类 | 产品子类 | 关键字 |
| --- | --- | --- | ---|
| 官方 | 性能测试 | 性能测试 | MindCluster ToolBox、带宽测试、Ascend DMI |

#### 问题现象

执行h2d、d2h偶现不达标，如下所示：

```
******# ascend-dmi --bw -t d2h -s 33554432 -d 1 -q
Device to Host ***
Device 1:xxxxx.
------------------------------------------------------------------------------
 ID      Size(Bytes)    Execute Times    Bandwidth(GB/s)     Elapsed Time(us)
------------------------------------------------------------------------------
  1       33554432           40             20.438206            1641.75
------------------------------------------------------------------------------
******# ascend-dmi --bw -t d2h -s 33554432 -d 0 -q
Device to Host ***
Device 0:xxxxx.
------------------------------------------------------------------------------
 ID      Size(Bytes)    Execute Times    Bandwidth(GB/s)     Elapsed Time(us)
------------------------------------------------------------------------------
  0       33554432           40             27.396825            1224.76
------------------------------------------------------------------------------
******# ascend-dmi --bw -t d2h -s 33554432 -d 2 -q
Device to Host ***
Device 2:xxxxx.
------------------------------------------------------------------------------
 ID      Size(Bytes)    Execute Times    Bandwidth(GB/s)     Elapsed Time(us)
------------------------------------------------------------------------------
  2       33554432           40             20.070948            1671.79
------------------------------------------------------------------------------
******# ascend-dmi --bw -t d2h -s 33554432 -d 1 -q
Device to Host ***
Device 1:xxxxx.
------------------------------------------------------------------------------
 ID      Size(Bytes)    Execute Times    Bandwidth(GB/s)     Elapsed Time(us)
------------------------------------------------------------------------------
  1       33554432           40             26.271698            1277.21
------------------------------------------------------------------------------
```

#### 可能原因

OS系统缓存不足，导致无法申请连续内存，从而影响性能不达标。

#### 解决措施

清理缓存或重启环境。

本页内容

- 问题信息
- 问题现象
- 可能原因
- 解决措施