ubuntu 14.04下cuda7.5升级到cuda8.0

OS：ubuntu 14.04

GPU：GTX 960

之前ubuntu已经安装了cuda7.5，本次通过deb升级到cuda8.0，参考了nvidia的英文安装指导，本人是第一次写博客，只是把自己操作的步骤写下来，有些地方可能有问题，请及时指正，谢谢！

升级之前的准备工作

1  uname -m && cat /etc/*release   # get ubuntu version
2  uname -r                                          # get ubuntu kernal version               

3   gcc --version                                    # get gcc version
4  lspci | grep -i nvidia                        # check nvidia GPU information
5  cat /proc/driver/nvidia/version        # check nvidia GPU driver version

开始升级cuda8.0

1    download 7fa2af80.pub file fromhttp://developer.download.nvidia.com/compute/cuda/repos/ubuntu1404/x86_64/7fa2af80.pub
2    cat 7fa2af80.pub | apt-key add -
3    download cuda-repo-ubuntu1404_8.0.44-1_amd64.deb fromhttp://developer.download.nvidia.com/compute/cuda/repos/ubuntu1404/x86_64/cuda-repo-ubuntu1404_8.0.44-1_amd64.deb

4    ms5sum cuda-repo-ubuntu1404_8.0.44-1_ amd64.deb    #check download file if available
5    sudo dpkg -i cuda-repo-ubuntu1404_8.0.44-1_ amd64.deb
6    sudo apt-get update
7    sudo apt-get install cuda
8    sudo vi ~/.bashrc       # add PATh and LD_LIBRARY_PATH at the end
      export PATH=/usr/local/cuda-8.0/bin:$ PATH
      export LD_LIBRARY_PATH=/usr/local/ cuda-8.0/lib64:$LD_LIBRARY_ PATH
9    Source ~/.bashrc
10  sudo reboot
11  dpkg -l | grep nvidia    # view all nvidia driver
12  nvidia-smi                      #check GPU memory information     
13  cd  /usr/local/cuda-8.0/samples
14  make                                # compile cuda-8.0 sample files
15  cd bin/x86_64/linux/release/    # run sample file
16  ./deviceQuery
17  ./bandwidthTest

我在安装完cuda8.0后没有重启ubuntu，运行sample的时候出现错误，could not insert 'nvidia_361_uvm':Invalid argument，检查nvidia driver version还是352.79，没有升级到361.93，而且运行nvidia-smi出现Failed to initialize NVML: Driver/library version mismatch，尝试重新安装361驱动，并sudo apt-get upgrade，然后重启ubuntu后，发现驱动升级到361.93了，运行nvidia-smi也显示正确GPU信息了。重新make sample file，在release目录下运行sample文件deviceQuery运行正常，返回正确值，passed

Nvidia linux安装指导

http://developer.download.nvidia.com/compute/cuda/8.0/secure/prod/docs/sidebar/CUDA_Installation_Guide_Linux.pdf?autho=1476947233_ffc28a9abf04a444f1c0fb12515b5795&file=CUDA_Installation_Guide_Linux.pdf