Dask Upstream Testing

This repository contains the scripts to run Dask's gpu-marked tests on a schedule and dask-dependent tests from some downstream libraries.

Version Policy

The primary goal here is to quickly identify breakages in tests defined in dask/dask and dask/distributed, so we'll use the latest main from each of those.

When breakages occur, they'll generally be fixed either in Dask or in the the nightly versions of the downstream packages (rapids, cupy, numba, etc.). And so we install the nightly (rather than latest) version of the downstream packages.

Workflow Dispatch

This repository uses workflow dispatch to enable running tests against a specific version of Dask.

Navigate to the cron workflow, select "Run workflow", and input a Dask version to test. This must be a branch name (like main) or a tag that is available in both Dask and Distributed repositorys (like 2025.4.1). The default is main.

Version Upgrades

We'd like to have a complete test run against a specific releaesd version of Dask prior to bumping the pin in rapids-dask-dependency. To test that

1. Update DASK_BRACH in install.sh to select the tag for a specific version
2. Update overrides.txt to pin to a specific version, rather than main

RAPIDS version update

After code freeze for a specific RAPIDS version (e.g. 25.06) when it's anticipated that no Dask version update is imminent, update the targeted RAPIDS version by changing

• RAPIDS_BRANCH in install.sh
• RAPID_VERSION_RANGE in install.sh
• The branch in the jobs.dask-tests.uses field of cron.yaml