# Environment variables¶

Here are the environment variables Chainer uses.

 CUPY_CACHE_DIR Path to the directory to store kernel cache. \$(HOME)/.cupy.kernel_cache is used by default. See CuPy Overview for detail.

## For install¶

These environment variables are only used during installation.

 CUDA_PATH Path to the directory containing CUDA. The parent of the directory containing nvcc is used as default. When nvcc is not found, /usr/local/cuda is used. See Install Chainer with CUDA for details.