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switch-cuda

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A simple bash script for switching between installed versions of CUDA.

// repository documentation

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switch-cuda
===========

Sometimes, it becomes necessary to switch to an earlier version of CUDA in order to run older code on a machine that is
actually set up to use the current version of the CUDA toolkit.
This is as simple as adjusting the values of a few environment variables, yet it is cumbersome to do manually.
Therefore, this repository provides the bash script [`switch-cuda.sh`](switch-cuda.sh), which adjusts the environment to
use a specific version of CUDA **for the current bash session**.

**Notice:** [`switch-cuda.sh`](switch-cuda.sh) has been written for and tested on Ubuntu 16.04, but is easily adapted
for other platforms.

Usage
-----

```
source switch-cuda.sh [VERSION]
```

Notice that the script has to be sourced rather than executed, as it performs changes of environment variables that are
supposed to persist after the script has finished.
If a version number is provided, than all relevant environment variables are adjusted to the required CUDA version
(including `PATH`, `LD_LIBRARY_PATH`, `CUDA_HOME`, and `CUDA_ROOT`).
If no version is provided, however, then the script simply prints all versions of CUDA that have been found on the used
machine (in `/usr/local`).

Examples
--------

```
$ source switch-cuda.sh 
The following CUDA installations have been found (in '/usr/local'):
* cuda-8.0
* cuda-9.0
* cuda-9.1
```

```
$ source switch-cuda.sh 9.0
Switched to CUDA 9.0.
```

switch-cuda

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