Managing virtual packages
"Virtual" packages are injected into the conda solver to allow real packages
to depend on features present on the system that cannot be managed directly by
conda, like system driver versions or CPU features. Virtual packages are not
real packages and not displayed by
conda list. Instead
conda runs a
small bit of code to detect the presence or absence of the system feature that
corresponds to the package. The currently supported list of virtual packages includes:
__cuda: Maximum version of CUDA supported by the display driver.
__osx: OSX version if applicable.
__glibc: Version of glibc supported by the OS.
__linux: Available when running on Linux.
__unix: Available when running on OSX or Linux.
__win: Available when running on Win.
Other virtual packages will be added in future conda releases. These are denoted by a leading double-underscore in the package name.
Use the terminal or an Anaconda Prompt for the following steps.
To see the list of detected virtual packages, run:
If a package is detected, you will see it listed in the
section, as shown in this example:
active environment : base active env location : /Users/demo/dev/conda/devenv shell level : 1 user config file : /Users/demo/.condarc populated config files : /Users/demo/.condarc conda version : 4.6.3.post8+8f640d35a conda-build version : 3.17.8 python version : 3.7.2.final.0 virtual packages : __cuda=10.0 base environment : /Users/demo/dev/conda/devenv (writable) channel URLs : https://repo.anaconda.com/pkgs/main/osx-64 https://repo.anaconda.com/pkgs/main/noarch https://repo.anaconda.com/pkgs/free/osx-64 https://repo.anaconda.com/pkgs/free/noarch https://repo.anaconda.com/pkgs/r/osx-64 https://repo.anaconda.com/pkgs/r/noarch package cache : /Users/demo/dev/conda/devenv/pkgs /Users/demo/.conda/pkgs envs directories : /Users/demo/dev/conda/devenv/envs /Users/demo/.conda/envs platform : osx-64 user-agent : conda/4.6.3.post8+8f640d35a requests/2.21.0 CPython/3.7.2 Darwin/17.7.0 OSX/10.13.6 UID:GID : 502:20 netrc file : None offline mode : False
For troubleshooting, it is possible to override virtual package detection using an environment variable. Supported variables include:
CONDA_OVERRIDE_CUDA- CUDA version number or set to
""for no CUDA detected.
CONDA_OVERRIDE_OSX- OSX version number or set to
""for no OSX detected.
CONDA_OVERRIDE_GLIBC- GLIBC version number or set to
""for no GLIBC. This only applies on Linux.