# py-rattler conda queue environment for Deadline Cloud
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The [conda\_queue\_env\_pyrattler.yaml](https://github.com/aws-deadline/deadline-cloud-samples/blob/mainline/queue_environments/conda_queue_env_pyrattler.yaml) queue environment provides the same functionality as the inline conda queue environments but uses the [py-rattler](https://conda.github.io/rattler/py-rattler/) library. Rattler is written in Rust and provides common functionality used in the conda ecosystem.

Testing has shown that this queue environment generally runs faster than the inline conda queue environments on the same instance types. The environments it creates are nearly the same. Two differences:
+ py-rattler doesn't include `pip` alongside `python` by default, so you must add `pip` explicitly when you need it.
+ py-rattler raises an error for a subset of syntax that conda accepts, such as `colmap=*=gpu*`.

The error messages py-rattler produces when failing to solve for a virtual environment don't include as much detail as conda's. If you need more detailed solver errors during development, switch to one of the inline conda queue environments.