# CLI

To aid you with finding the parameters, `argon2_cffi` offers a CLI interface that can be accessed using `python -m argon2`. It will benchmark Argon2’s password verification in the current environment. You can use command line arguments to set hashing parameters:

    $ python -m argon2
    Running Argon2id 100 times with:
    hash_len: 16 bytes
    memory_cost: 102400 KiB
    parallelism: 8 threads
    time_cost: 2 iterations

    Measuring...

    45.3ms per password verification

This should make it much easier to determine the right parameters for your use case and your environment.