# Frequent Error

q2l

\[toc]

## Environment

### Failed to initialize NVML: Driver/library version mismatch

* 原因：驱动更新导致不匹配
* 解决方案：
  * 卸载 kernel mode
  * sudo rmmod nvidia
  * 在卸载中可能会遇到相关进程被占用的报错，只需要卸载占用的进程即可   
* 实例：  

  \`\`\`bash

  (base) \[q2l\@gpu4 \~]$ nvidia-smi

  Failed to initialize NVML: Driver/library version mismatch

  (base) \[q2l\@gpu4 \~]$ sudo lsof -n -w /dev/nvidia\* //查看当前正在运行的Nvidia进程，发现并没有

  (base) \[q2l\@gpu4 \~]$ sudo rmmod nvidia

  rmmod: ERROR: Module nvidia is in use by: nvidia\_modeset

  (base) \[q2l\@gpu4 \~]$ sudo rmmod nvidia\_modeset

  rmmod: ERROR: Module nvidia\_modeset is in use by: nvidia\_drm

  (base) \[q2l\@gpu4 \~]$ sudo rmmod nvidia\_drm

  (base) \[q2l\@gpu4 \~]$ sudo rmmod nvidia\_modeset

  (base) \[q2l\@gpu4 \~]$ sudo rmmod nvidia

  (base) \[q2l\@gpu4 \~]$ nvidia-smi

  Fri Jun  5 09:05:02 2020       

  +-----------------------------------------------------------------------------+

  \| NVIDIA-SMI 440.33.01    Driver Version: 440.33.01    CUDA Version: 10.2     |

  \|-------------------------------+----------------------+----------------------+

  \| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |

  \| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |

  |===============================+======================+======================|

  \|   0  Tesla V100-PCIE...  Off  | 00000000:06:00.0 Off |                    0 |

  \| N/A   49C    P0    40W / 250W |      0MiB / 32510MiB |      0%      Default |

  +-------------------------------+----------------------+----------------------+

  \|   1  Tesla V100-PCIE...  Off  | 00000000:84:00.0 Off |                    0 |

  \| N/A   46C    P0    40W / 250W |      0MiB / 32510MiB |      0%      Default |

  +-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+ | Processes: GPU Memory | | GPU PID Type Process name Usage | |=============================================================================| | No running processes found | +-----------------------------------------------------------------------------+

\`\`\`

* Reference: [nvidia-smi:command not found 问题解决,Failed to initialize NVML: Driver/library version mismatch](https://blog.csdn.net/fengzhongluoleidehua/article/details/82626538)