更新CUDA Toolkit版本后nvcc版本保持不变

Question

我使用以下命令在 Ubuntu 22.04 中安装了 CUDA Toolkit 12.6 Update 1（可在此处找到说明）：

wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64/cuda-ubuntu2204.pin
sudo mv cuda-ubuntu2204.pin /etc/apt/preferences.d/cuda-repository-pin-600
wget https://developer.download.nvidia.com/compute/cuda/12.6.1/local_installers/cuda-repo-ubuntu2204-12-6-local_12.6.1-560.35.03-1_amd64.deb
sudo dpkg -i cuda-repo-ubuntu2204-12-6-local_12.6.1-560.35.03-1_amd64.deb
sudo cp /var/cuda-repo-ubuntu2204-12-6-local/cuda-*-keyring.gpg /usr/share/keyrings/
sudo apt-get update
sudo apt-get -y install cuda-toolkit-12-6

安装成功。不过，

nvcc

版本仍然是11.5。这是我安装的2个包。我以为安装 CUDA Toolkit 12.6 会取代 11.5，但 NVCC 仍然来自 11.5。

$ dpkg -l nvidia-cuda-toolkit
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                Version         Architecture Description
+++-===================-===============-============-=================================
ii  nvidia-cuda-toolkit 11.5.1-1ubuntu1 amd64        NVIDIA CUDA development toolkit

$ dpkg -l cuda-toolkit-12-6
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name              Version      Architecture Description
+++-=================-============-============-=================================
ii  cuda-toolkit-12-6 12.6.1-1     amd64        CUDA Toolkit 12.6 meta-package

如何将

nvcc

版本更新至12.6？

---

这是

nvcc -V

的输出：

$ nvcc -V
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2021 NVIDIA Corporation
Built on Thu_Nov_18_09:45:30_PST_2021
Cuda compilation tools, release 11.5, V11.5.119
Build cuda_11.5.r11.5/compiler.30672275_0

列出

cuda-toolkit-12-6

的内容，不包括

nvcc

:

$ dpkg -L cuda-toolkit-12-6
/.
/usr
/usr/local
/usr/local/cuda-12.6
/usr/local/cuda-12.6/version.json
/usr/share
/usr/share/doc
/usr/share/doc/cuda-toolkit-12-6
/usr/share/doc/cuda-toolkit-12-6/changelog.Debian.gz

nvidia-smi

的输出：

$ nvidia-smi
Mon Sep 23 13:11:55 2024       
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 535.183.01             Driver Version: 535.183.01   CUDA Version: 12.2     |
|-----------------------------------------+----------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |         Memory-Usage | GPU-Util  Compute M. |
|                                         |                      |               MIG M. |
|=========================================+======================+======================|
|   0  NVIDIA GeForce RTX 4090        Off | 00000000:81:00.0 Off |                  Off |
|  0%   24C    P8              21W / 450W |  10893MiB / 24564MiB |      0%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+
|   1  NVIDIA GeForce RTX 4090        Off | 00000000:C1:00.0 Off |                  Off |
|  0%   24C    P8              32W / 450W |    818MiB / 24564MiB |      0%      Default |
|                                         |                      |                  N/A |
+-----------------------------------------+----------------------+----------------------+
                                                                                         
+---------------------------------------------------------------------------------------+
| Processes:                                                                            |
|  GPU   GI   CI        PID   Type   Process name                            GPU Memory |
|        ID   ID                                                             Usage      |
|=======================================================================================|
|    0   N/A  N/A      1720      G   /usr/lib/xorg/Xorg                            4MiB |
|    0   N/A  N/A      2174      C   /usr/local/bin/ollama                       384MiB |
|    0   N/A  N/A   1808406      C   /opt/tljh/user/bin/python                 10486MiB |
|    1   N/A  N/A      1720      G   /usr/lib/xorg/Xorg                           15MiB |
|    1   N/A  N/A      1896      G   /usr/bin/gnome-shell                         10MiB |
|    1   N/A  N/A      2174      C   /usr/local/bin/ollama                       384MiB |
|    1   N/A  N/A   1808406      C   /opt/tljh/user/bin/python                   386MiB |
+---------------------------------------------------------------------------------------+

Answer 1

您应该检查您的环境变量。

nvcc

可能仍指向 CUDA 11.5，因为您的

PATH

和

LD_LIBRARY_PATH

设置为旧版本。

要解决此问题，请通过将以下行添加到您的

.bashrc

（或

.zshrc

）来更新环境变量：

export PATH=/usr/local/cuda-12.6/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-12.6/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}
export CUDA_HOME=/usr/local/cuda-12.6

然后，获取文件：

source ~/.bashrc

这应该使

nvcc

指向正确的 CUDA 版本。

或创建一个指向新 CUDA 版本的符号链接。