From 9eb9876c765eb2a3c99e712df5b221874bae6d3a Mon Sep 17 00:00:00 2001
From: ChrisRackauckas <accounts@chrisrackauckas.com>
Date: Mon, 23 Mar 2026 10:26:50 -0100
Subject: [PATCH 1/2] Replace Buildkite CI with GitHub Actions self-hosted GPU
 runners

- Remove `.buildkite/runtests.yml` (GPU and Correctness tests on Buildkite)
- Add `.github/workflows/GPU.yml` running GPU tests on `[self-hosted, Linux, X64, gpu]` runners
- Coverage is now collected via `julia-processcoverage` and uploaded to Codecov

Part of the SciML-wide migration from Buildkite to GitHub Actions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 .buildkite/runtests.yml   | 35 -----------------------------------
 .github/workflows/GPU.yml | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 35 deletions(-)
 delete mode 100644 .buildkite/runtests.yml
 create mode 100644 .github/workflows/GPU.yml

diff --git a/.buildkite/runtests.yml b/.buildkite/runtests.yml
deleted file mode 100644
index 9f924f44..00000000
--- a/.buildkite/runtests.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-steps:
-  - label: "GPU"
-    plugins:
-      - JuliaCI/julia#v1:
-          version: "1"
-      - JuliaCI/julia-test#v1:
-           coverage: false # 1000x slowdown
-    agents:
-      queue: "juliagpu"
-      cuda: "*"
-    env:
-      GROUP: 'GPU'
-      JULIA_PKG_SERVER: "" # it often struggles with our large artifacts
-      # SECRET_CODECOV_TOKEN: "..."
-    timeout_in_minutes: 60
-    # Don't run Buildkite if the commit message includes the text [skip tests]
-    if: build.message !~ /\[skip tests\]/
-
-  - label: "Correctness"
-    plugins:
-      - JuliaCI/julia#v1:
-          version: "1.10"
-      - JuliaCI/julia-test#v1:
-          coverage: true
-          julia_args: "--threads=auto"
-    agents:
-      os: "linux"
-      queue: "juliaecosystem"
-      arch: "x86_64"
-      exclusive: true
-    env:
-      GROUP: 'Correctness'
-    timeout_in_minutes: 120
-    # Don't run Buildkite if the commit message includes the text [skip tests]
-    if: build.message !~ /\[skip tests\]/
diff --git a/.github/workflows/GPU.yml b/.github/workflows/GPU.yml
new file mode 100644
index 00000000..e8f4a604
--- /dev/null
+++ b/.github/workflows/GPU.yml
@@ -0,0 +1,38 @@
+name: "GPU Tests"
+
+on:
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - 'docs/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref_name != github.event.repository.default_branch || github.ref != 'refs/tags/v*' }}
+
+jobs:
+  gpu-tests:
+    name: "GPU Tests"
+    runs-on: [self-hosted, Linux, X64, gpu]
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v6
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: "1"
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+        env:
+          GROUP: "GPU"
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v5
+        with:
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: false

From 00e6698038536b638cbd6c0dfb5a135ee5778a92 Mon Sep 17 00:00:00 2001
From: ChrisRackauckas <accounts@chrisrackauckas.com>
Date: Mon, 23 Mar 2026 11:00:17 -0100
Subject: [PATCH 2/2] Fix GPU test group env var to match test file (CUDA, not
 GPU)

The test file checks GROUP == "CUDA" for GPU tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 .github/workflows/GPU.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/GPU.yml b/.github/workflows/GPU.yml
index e8f4a604..f7105faa 100644
--- a/.github/workflows/GPU.yml
+++ b/.github/workflows/GPU.yml
@@ -29,7 +29,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
         env:
-          GROUP: "GPU"
+          GROUP: "CUDA"
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v5
         with: