blocks|key|4883682|text|更改您的CUDA软链接指向您想要的CUDA版本。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4883683|ll+/usr/local/cuda+lrwxrwxrwx+1根根，2017年9月19日/usr/local/cuda+->+/usr/local/cuda-8.0/|blockquote|4883684|只要把它与|4883685|Update:如果符号链接已经存在，请使用另一个命令：|4883686|[jalal@goku+~]$+ls+/usr/local/cuda
lrwxrwxrwx.+1+root+root+20+Sep+14+08:03+/usr/local/cuda+->+/usr/local/cuda-10.2

[jalal@goku+~]$+sudo+ln+-sfT+/usr/local/cuda/cuda-11.1/+/usr/local/cuda
[jalal@goku+~]$+ls+/usr/local/cuda
lrwxrwxrwx.+1+root+root+26+Sep+14+13:25+/usr/local/cuda+->+/usr/local/cuda/cuda-11.1/|code-block|syntax|javascript|4883687|ln+-s+/usr/local/cuda-7.5+/usr/local/cuda|4883688|(有适当的安装位置)|4883689|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|X|8|@]|9|@]|A|$L|M]]|$1|N|3|O|5|D|7|Y|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|Z|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|S|$]]

Change your CUDA soft link to point on your desired CUDA version. For example:
<blockquote>
ll /usr/local/cuda
lrwxrwxrwx 1 root root 19 Sep 06 2017 /usr/local/cuda -&gt; /usr/local/cuda-8.0/
</blockquote>
Simply relink it with
Update:
If the symlink already exists, use this other command:
<pre><code>[jalal@goku ~]$ ls /usr/local/cuda
lrwxrwxrwx. 1 root root 20 Sep 14 08:03 /usr/local/cuda -&gt; /usr/local/cuda-10.2

[jalal@goku ~]$ sudo ln -sfT /usr/local/cuda/cuda-11.1/ /usr/local/cuda
[jalal@goku ~]$ ls /usr/local/cuda
lrwxrwxrwx. 1 root root 26 Sep 14 13:25 /usr/local/cuda -&gt; /usr/local/cuda/cuda-11.1/
</code></pre>
<blockquote>
ln -s /usr/local/cuda-7.5 /usr/local/cuda
</blockquote>
(With the proper installation location)

blocks|key|636271|text|我终于解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|636272|修改~/..bash_profile以将路径更改为CUDA是正确的方法。但是，当您更改文件时，您需要重新启动bash。|offset|length|style|BOLD|636273|简单地说，source+~/.bash_profile是行不通的。因为source只会将文件中的内容附加到已经存在的路径中，而不是覆盖它。|CODE|636274|entityMap^0|0|1E|8|0|5|M|Z|6|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@$D|O|E|P|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@$D|R|E|S|F|J]|$D|T|E|U|F|J]]|9|@]|A|$]]|$1|K|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|L|$]]

I solved the problem finally.

Modifying ~/.bash_profile to change the path to CUDA is the correct way. But when you changed the file, you need to relaunch the bash. 

Simply <code>source ~/.bash_profile</code> won't work. Because <code>source</code> will only append the content in the file to the already existed path rather than cover it.

blocks|key|4883747|text|也许有点晚了，但我认为这对任何遇到这个问题的人来说还是有帮助的。我编写了一个简单的bash脚本，用于在当前bash会话中切换到不同版本的数据自动化系统：https://github.com/phohenecker/switch-cuda|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4883748|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/phohenecker/switch-cuda^0|24|16|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Maybe a bit late, but I thought it might still be helpful for anyone who comes across this question. I wrote a simple bash script for switching to a different version of CUDA within the current bash session: <a href="https://github.com/phohenecker/switch-cuda" rel="noreferrer">https://github.com/phohenecker/switch-cuda</a>

blocks|key|636297|text|也许更清洁：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|636298|sudo+update-alternatives+--display+cuda

sudo+update-alternatives+--config+cuda|code-block|syntax|javascript|636299|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Perhaps cleaner:
<pre><code>sudo update-alternatives --display cuda

sudo update-alternatives --config cuda
</code></pre>

blocks|key|636301|text|此解决方案解释了如何安装多个不同的版本，即10.2、11.3和11.6，并在它们之间切换。它是@w.t的扩展，并使用update-alternatives。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|636302|Afaik，在cuda+11.x之后，Ubuntu20.04Cuda安装上的安装将自动添加到update-alternatives维护中。|636303|假设您安装了cuda+10.2、cuda+11.3和cuda+11.6+(遵循官方的nvidia安装指南：https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html)。他们都将居住在：|636304|/usr/local/cuda-10.2/...
/usr/local/cuda-11.3/...
/usr/local/cuda-11.6/...|code-block|syntax|javascript|636305|您的update-alternatives将有两个条目：|636306|$+sudo+update-alternatives+--query+cuda
...
/usr/local/cuda-11-3+-+priority+113
/usr/local/cuda-11-6+-+priority+116|636307|解决方案1：如果您想使用update-alternatives，请确保您的cuda+符号链接指向/etc/alternatives/cuda。|636308|#+Change+the+symbolic+link+target.
$+sudo+ln+-sfT+/etc/alternatives/cuda+/usr/local/cuda|636309|#+Check+the+path.
$+ll+/usr/local/cuda

lrwxrwrwrwx+1+root+root+/usr/local/cuda+->+/etc/alternatives/cuda/|636310|现在，剩下的就是确保/etc/alternatives/cuda指向您想要使用的版本，例如11.3。|636311|您可以通过以下方式进行更新：|636312|$+sudo+update-alternatives+--config+cuda|636313|并按照说明修改版本。|636314|检查路径：|636315|$+ll+/etc/alternatives/cuda

lrwrwrwrwx+root+root+/etc/alternatives+->+/usr/local/cuda-11.3|636316|快好了。|636317|始终确保在您的PATHs+~/.bashrc**.**中加载正确的库。|636318|解决方案2:直接将/usr/local/cuda符号链接设置为正确的版本。|636319|$+ln+-sfT+/usr/local/cuda-11.3+/usr/local/cuda|636320|重新启动您的机器，并再次检查所有设置是否正确：|636321|$+nvcc+-V

nvcc:+NVIDIA+(R)+Cuda+compiler+driver
Copyright+(c)+2005-2021+NVIDIA+Corporation
Built+on+Mon_May3+19:15:14_PDT_2021
Cuda+compilation+tools,+release+11.3+V11.3.109
Build+cuda+11.3.r11.3/compiler.29920130_0|636322|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html^0|C|5|1M|J|0|1A|J|0|1H|1X|0|0|0|2|J|0|0|0|5|16|4|C|J|1C|M|0|0|0|A|M|0|0|0|0|0|0|0|7|5|D|B|Y|1|7|5|D|9|0|0|11|9|F|0|0|0|N|0|0^^$0|@$1|2|3|4|5|6|7|1V|8|@$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|20|8|@$9|21|A|22|B|D]]|E|@]|F|$]]|$1|I|3|J|5|6|7|23|8|@]|E|@$9|24|A|25|1|26]]|F|$]]|$1|K|3|L|5|M|7|27|8|@]|E|@]|F|$N|O]]|$1|P|3|Q|5|6|7|28|8|@$9|29|A|2A|B|D]]|E|@]|F|$]]|$1|R|3|S|5|M|7|2B|8|@]|E|@]|F|$N|O]]|$1|T|3|U|5|6|7|2C|8|@$9|2D|A|2E|B|C]|$9|2F|A|2G|B|C]|$9|2H|A|2I|B|D]|$9|2J|A|2K|B|D]]|E|@]|F|$]]|$1|V|3|W|5|M|7|2L|8|@]|E|@]|F|$N|O]]|$1|X|3|Y|5|M|7|2M|8|@]|E|@]|F|$N|O]]|$1|Z|3|10|5|6|7|2N|8|@$9|2O|A|2P|B|D]]|E|@]|F|$]]|$1|11|3|12|5|6|7|2Q|8|@]|E|@]|F|$]]|$1|13|3|14|5|M|7|2R|8|@]|E|@]|F|$N|O]]|$1|15|3|16|5|6|7|2S|8|@]|E|@]|F|$]]|$1|17|3|18|5|6|7|2T|8|@]|E|@]|F|$]]|$1|19|3|1A|5|M|7|2U|8|@]|E|@]|F|$N|O]]|$1|1B|3|1C|5|6|7|2V|8|@]|E|@]|F|$]]|$1|1D|3|1E|5|6|7|2W|8|@$9|2X|A|2Y|B|C]|$9|2Z|A|30|B|C]|$9|31|A|32|B|C]|$9|33|A|34|B|D]|$9|35|A|36|B|D]]|E|@]|F|$]]|$1|1F|3|1G|5|6|7|37|8|@$9|38|A|39|B|C]|$9|3A|A|3B|B|D]]|E|@]|F|$]]|$1|1H|3|1I|5|M|7|3C|8|@]|E|@]|F|$N|O]]|$1|1J|3|1K|5|6|7|3D|8|@$9|3E|A|3F|B|C]]|E|@]|F|$]]|$1|1L|3|1M|5|M|7|3G|8|@]|E|@]|F|$N|O]]|$1|1N|3|-4|5|6|7|3H|8|@]|E|@]|F|$]]]|1O|$1P|$5|1Q|1R|1S|F|$1T|1U]]]]

This solution explains how you can have multiple different cuda versions installed, i.e. 10.2, 11.3 and 11.6 and switch between them. It's an extension of @w.t and makes use of <code>update-alternatives</code>.
Afaik, after cuda 11.x the installations on Ubuntu 20.04 cuda installations will be added to the <code>update-alternatives</code> maintenance automatically.
Let's say you installed cuda 10.2, cuda 11.3 and cuda 11.6 (following the official nvidia installation guide: <a href="https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html" rel="nofollow noreferrer">https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html</a>). They will all reside in:
<pre><code>/usr/local/cuda-10.2/...
/usr/local/cuda-11.3/...
/usr/local/cuda-11.6/...
</code></pre>
Your <code>update-alternatives</code> will have two entries:
<pre><code>$ sudo update-alternatives --query cuda
...
/usr/local/cuda-11-3 - priority 113
/usr/local/cuda-11-6 - priority 116
</code></pre>
Solution 1: If you want to make use of the <code>update-alternatives</code> make sure that your cuda symbolic link points to <code>/etc/alternatives/cuda</code>.
<pre><code># Change the symbolic link target.
$ sudo ln -sfT /etc/alternatives/cuda /usr/local/cuda
</code></pre>
<pre><code># Check the path.
$ ll /usr/local/cuda

lrwxrwrwrwx 1 root root /usr/local/cuda -&gt; /etc/alternatives/cuda/
</code></pre>
Now, all that is left is to make sure <code>/etc/alternatives/cuda</code> points to the version you want to use, e.g. 11.3.
You can make that update with:
<pre><code>$ sudo update-alternatives --config cuda
</code></pre>
and follow the instructions to change the version.
Check the path:
<pre><code>$ ll /etc/alternatives/cuda

lrwrwrwrwx root root /etc/alternatives -&gt; /usr/local/cuda-11.3
</code></pre>
almost done.
And always make sure to load the correct library <code>PATHs</code> in your <code>~/.bashrc</code>.
Solution 2:
Directly set your <code>/usr/local/cuda</code> symbolic link to the correct version.
<pre><code>$ ln -sfT /usr/local/cuda-11.3 /usr/local/cuda
</code></pre>
Reboot your machine and double check everything is set properly:
<pre><code>$ nvcc -V

nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2021 NVIDIA Corporation
Built on Mon_May3 19:15:14_PDT_2021
Cuda compilation tools, release 11.3 V11.3.109
Build cuda 11.3.r11.3/compiler.29920130_0
</code></pre>

blocks|key|4883840|text|我从库达10.2转到11.7。export+PATH=/etc/alternatives/cuda/bin:$PATH为我做了这个把戏。我在这个线程中找到了解决方案：https://stackoverflow.com/a/40599478/7924573|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4883841|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/40599478/7924573^0|F|18|2B|18|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

I switched from cuda 10.2 to 11.7. <code>export PATH=/etc/alternatives/cuda/bin:$PATH</code> did the trick for me. I found the solution in this thread: <a href="https://stackoverflow.com/a/40599478/7924573">https://stackoverflow.com/a/40599478/7924573</a>

I met this error when compiling a modified caffe version.

<code>OpenCV static library was compiled with CUDA 7.5 support. Please, use the same version or rebuild OpenCV with CUDA 8.0</code>

I have some old code may not compatible with CUDA8.0, so I want to change my cuda version for this error.

I modified my ~/.bash_profile like this

<pre><code># export PYTHONPATH=$PYTHONPATH:/usr/local/cuda-8.0/lib64/
# export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/cuda-8.0/lib64
export PYTHONPATH=$PYTHONPATH:/usr/local/cuda-7.5/targets/x86_64-linux/lib/
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/cuda-7.5/targets/x86_64-linux/lib/
</code></pre>

But it did't work. Still the same error. What should I do? Thanks.

How to change CUDA version

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在编译修改后的caffe版本时遇到了这个错误。OpenCV static library was compiled with CUDA 7.5 support. Please, use the same version or rebuild OpenCV with CUDA 8.0我有一些旧代码可能与CUDA8.0不...

问如何修改数据自动化系统版本
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