multi_cuda_exchange.txt

=====================================安装cuda9.1=========================================
1.version
cuda10.0.130
cudnn7.4.2
配置文件在  gedit ~/.bashrc

enviroment of cuda10.0
export CUDA_HOME=/usr/local/cuda 
export PATH=$PATH:$CUDA_HOME/bin 
export LD_LIBRARY_PATH=/usr/local/cuda-10.0/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}


export CUDA_HOME=/usr/local/cuda 
export PATH=$PATH:$CUDA_HOME/bin 
export LD_LIBRARY_PATH=/usr/local/cuda-9.1/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}


切换cuda10 切换到 cuda9.1
sudo rm -rf /usr/local/cuda #删除之前创建的软链接
sudo ln -s /usr/local/cuda-9.1 /usr/local/cuda #创建新 cuda 的软链接


切换cuda9.1 切换到 cuda10.0
sudo rm -rf /usr/local/cuda #删除之前创建的软链接
sudo ln -s /usr/local/cuda-10.0 /usr/local/cuda #创建新 cuda 的软链接


切换cuda9.1 切换到 cuda9.1
sudo rm -rf /usr/local/cuda #删除之前创建的软链接
sudo ln -s /usr/local/cuda-9.0 /usr/local/cuda #创建新 cuda 的软链接

切换到cuda8.0
sudo rm -rf /usr/local/cuda #删除之前创建的软链接
sudo ln -s /usr/local/cuda-8.0 /usr/local/cuda #创建新 cuda 的软链接


2.unbutn18.04默认gcc g++ 版本时7
安装cuda9.0时需要，降低gcc g++的版本
sudo apt-get install gcc-6 g++-6
cd /usr/bin
sudo rm gcc
sudo ln -s gcc-6 gcc
sudo rm g++
sudo ln -s g++-6 g++


升级会7命令如下：
cd /usr/bin
sudo rm gcc
sudo ln -s gcc-7 gcc
sudo rm g++
sudo ln -s g++-7 g++


3.安装的默认路径
Cuda
/usr/local/cuda-9.1

CUDA 9.1 Samples
/home/ys