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# 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:
```console
$ python -m argon2
Running Argon2id 100 times with:
hash_len: 32 bytes
memory_cost: 65536 KiB
parallelism: 4 threads
time_cost: 3 iterations
Measuring...
45.7ms per password verification
```
You can use command line arguments to set hashing parameters.
Either by setting them one by one (`-t` for time, `-m` for memory, `-p` for parallelism, `-l` for hash length), or by passing `--profile` followed by one of the names from {mod}`argon2.profiles`.
In that case, the other parameters are ignored.
If you don't pass any arguments as above, it runs with {class}`argon2.PasswordHasher`'s default values.
This should make it much easier to determine the right parameters for your use case and your environment.
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