From ec1a1bf0ca1f1a25dfc0bd850f344cff6ebcc356 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Sun, 6 Sep 2026 14:29:13 -0700
Subject: [PATCH 1/9] ci: cache libcudf JIT kernels in C++ tests

---
 .github/workflows/pr.yaml   | 4 +++-
 .github/workflows/test.yaml | 4 +++-
 ci/test_cpp_common.sh       | 7 ++++++-
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 6abfeaad8dc0..fba4c90883df 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -305,11 +305,13 @@ jobs:
       packages: read
       pull-requests: read
     secrets: inherit # zizmor: ignore[secrets-inherit]
-    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@main
+    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@codex/caller-cache-directories
     if: fromJSON(needs.changed-files.outputs.changed_file_groups).cpp_build_inputs || fromJSON(needs.changed-files.outputs.changed_file_groups).cpp_test_files || fromJSON(needs.changed-files.outputs.changed_file_groups).test_cpp
     with:
       build_type: pull-request
       script: ci/test_cpp.sh
+      cache-paths: ${{ github.workspace }}/.cache/libcudf
+      cache-key-prefix: libcudf-rtcx-v1
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-python-build:
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 7c73aad711c1..2fa44dd98718 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -47,13 +47,15 @@ jobs:
       packages: read
       pull-requests: read
     secrets: inherit # zizmor: ignore[secrets-inherit]
-    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@main
+    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@codex/caller-cache-directories
     with:
       build_type: ${{ inputs.build_type }}
       branch: ${{ inputs.branch }}
       date: ${{ inputs.date }}
       script: ci/test_cpp.sh
       sha: ${{ inputs.sha }}
+      cache-paths: ${{ github.workspace }}/.cache/libcudf
+      cache-key-prefix: libcudf-rtcx-v1
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-cpp-benchmark-tests:
diff --git a/ci/test_cpp_common.sh b/ci/test_cpp_common.sh
index a0607b278911..4b348eae64f6 100755
--- a/ci/test_cpp_common.sh
+++ b/ci/test_cpp_common.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-FileCopyrightText: Copyright (c) 2022-2026, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
 set -euo pipefail
@@ -33,6 +33,11 @@ RESULTS_DIR=${RAPIDS_TESTS_DIR:-"$(mktemp -d)"}
 RAPIDS_TESTS_DIR=${RAPIDS_TESTS_DIR:-"${RESULTS_DIR}/test-results"}/
 mkdir -p "${RAPIDS_TESTS_DIR}"
 
+# Keep JIT-compiled kernels in the workspace so CI can persist them across jobs.
+JIT_CACHE_ROOT=${GITHUB_WORKSPACE:-${PWD}}
+export LIBCUDF_KERNEL_CACHE_PATH="${LIBCUDF_KERNEL_CACHE_PATH:-${JIT_CACHE_ROOT}/.cache/libcudf}"
+mkdir -p "${LIBCUDF_KERNEL_CACHE_PATH}"
+
 rapids-print-env
 
 rapids-logger "Check GPU usage"

From fc3b0eef30352b514716bb12ef2600944c7c8247 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Sun, 6 Sep 2026 16:00:05 -0700
Subject: [PATCH 2/9] fix: cache workspace-relative JIT paths

---
 .github/workflows/pr.yaml   | 2 +-
 .github/workflows/test.yaml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index fba4c90883df..4d0173a864dc 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -310,7 +310,7 @@ jobs:
     with:
       build_type: pull-request
       script: ci/test_cpp.sh
-      cache-paths: ${{ github.workspace }}/.cache/libcudf
+      cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 2fa44dd98718..7c755c6caf96 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -54,7 +54,7 @@ jobs:
       date: ${{ inputs.date }}
       script: ci/test_cpp.sh
       sha: ${{ inputs.sha }}
-      cache-paths: ${{ github.workspace }}/.cache/libcudf
+      cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))

From f7b257696ad11a38da9a16059d9f8259684f2a0d Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 11:53:28 -0700
Subject: [PATCH 3/9] refactor: configure libcudf JIT cache through workflow

---
 .github/workflows/pr.yaml   | 1 +
 .github/workflows/test.yaml | 1 +
 ci/test_cpp_common.sh       | 6 +++---
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 4d0173a864dc..2ea7e933a198 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -312,6 +312,7 @@ jobs:
       script: ci/test_cpp.sh
       cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
+      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=${{ github.workspace }}/.cache/libcudf
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-python-build:
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 7c755c6caf96..bcacaf8b5eaa 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -56,6 +56,7 @@ jobs:
       sha: ${{ inputs.sha }}
       cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
+      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=${{ github.workspace }}/.cache/libcudf
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-cpp-benchmark-tests:
diff --git a/ci/test_cpp_common.sh b/ci/test_cpp_common.sh
index 4b348eae64f6..730fd2cb8828 100755
--- a/ci/test_cpp_common.sh
+++ b/ci/test_cpp_common.sh
@@ -33,9 +33,9 @@ RESULTS_DIR=${RAPIDS_TESTS_DIR:-"$(mktemp -d)"}
 RAPIDS_TESTS_DIR=${RAPIDS_TESTS_DIR:-"${RESULTS_DIR}/test-results"}/
 mkdir -p "${RAPIDS_TESTS_DIR}"
 
-# Keep JIT-compiled kernels in the workspace so CI can persist them across jobs.
-JIT_CACHE_ROOT=${GITHUB_WORKSPACE:-${PWD}}
-export LIBCUDF_KERNEL_CACHE_PATH="${LIBCUDF_KERNEL_CACHE_PATH:-${JIT_CACHE_ROOT}/.cache/libcudf}"
+# CI provides LIBCUDF_KERNEL_CACHE_PATH through the reusable workflow's cache-environment input.
+# Keep a workspace-relative default for local runs.
+export LIBCUDF_KERNEL_CACHE_PATH="${LIBCUDF_KERNEL_CACHE_PATH:-${PWD}/.cache/libcudf}"
 mkdir -p "${LIBCUDF_KERNEL_CACHE_PATH}"
 
 rapids-print-env

From 91f56ef4fade3b2bad623d9dda0d3cdff2a3f459 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 12:34:11 -0700
Subject: [PATCH 4/9] fix: use workspace-relative libcudf JIT cache path

---
 .github/workflows/pr.yaml   | 2 +-
 .github/workflows/test.yaml | 2 +-
 ci/test_cpp_common.sh       | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 2ea7e933a198..2d8ddb854a8c 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -312,7 +312,7 @@ jobs:
       script: ci/test_cpp.sh
       cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
-      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=${{ github.workspace }}/.cache/libcudf
+      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=.cache/libcudf
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-python-build:
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index bcacaf8b5eaa..d9bc251bebf4 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -56,7 +56,7 @@ jobs:
       sha: ${{ inputs.sha }}
       cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
-      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=${{ github.workspace }}/.cache/libcudf
+      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=.cache/libcudf
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-cpp-benchmark-tests:
diff --git a/ci/test_cpp_common.sh b/ci/test_cpp_common.sh
index 730fd2cb8828..d88e604b0ef7 100755
--- a/ci/test_cpp_common.sh
+++ b/ci/test_cpp_common.sh
@@ -33,8 +33,8 @@ RESULTS_DIR=${RAPIDS_TESTS_DIR:-"$(mktemp -d)"}
 RAPIDS_TESTS_DIR=${RAPIDS_TESTS_DIR:-"${RESULTS_DIR}/test-results"}/
 mkdir -p "${RAPIDS_TESTS_DIR}"
 
-# CI provides LIBCUDF_KERNEL_CACHE_PATH through the reusable workflow's cache-environment input.
-# Keep a workspace-relative default for local runs.
+# CI provides LIBCUDF_KERNEL_CACHE_PATH as a workspace-relative path through the reusable workflow's
+# cache-environment input. Keep the same default for local runs.
 export LIBCUDF_KERNEL_CACHE_PATH="${LIBCUDF_KERNEL_CACHE_PATH:-${PWD}/.cache/libcudf}"
 mkdir -p "${LIBCUDF_KERNEL_CACHE_PATH}"
 

From 5609d4c0777eefc999712bb438ad1275e73c1183 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 13:38:54 -0700
Subject: [PATCH 5/9] fix: resolve libcudf JIT cache path before CTest

---
 ci/test_cpp_common.sh | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/ci/test_cpp_common.sh b/ci/test_cpp_common.sh
index d88e604b0ef7..2882ee80fc2b 100755
--- a/ci/test_cpp_common.sh
+++ b/ci/test_cpp_common.sh
@@ -33,9 +33,13 @@ RESULTS_DIR=${RAPIDS_TESTS_DIR:-"$(mktemp -d)"}
 RAPIDS_TESTS_DIR=${RAPIDS_TESTS_DIR:-"${RESULTS_DIR}/test-results"}/
 mkdir -p "${RAPIDS_TESTS_DIR}"
 
-# CI provides LIBCUDF_KERNEL_CACHE_PATH as a workspace-relative path through the reusable workflow's
-# cache-environment input. Keep the same default for local runs.
-export LIBCUDF_KERNEL_CACHE_PATH="${LIBCUDF_KERNEL_CACHE_PATH:-${PWD}/.cache/libcudf}"
+# CI provides LIBCUDF_KERNEL_CACHE_PATH through the reusable workflow's cache-environment input.
+# Resolve a workspace-relative value before CTest changes its working directory.
+LIBCUDF_KERNEL_CACHE_PATH="${LIBCUDF_KERNEL_CACHE_PATH:-.cache/libcudf}"
+if [[ "${LIBCUDF_KERNEL_CACHE_PATH}" != /* ]]; then
+  LIBCUDF_KERNEL_CACHE_PATH="$(realpath -m "${LIBCUDF_KERNEL_CACHE_PATH}")"
+fi
+export LIBCUDF_KERNEL_CACHE_PATH
 mkdir -p "${LIBCUDF_KERNEL_CACHE_PATH}"
 
 rapids-print-env

From 496427fe03407c1970cfa9bb321d51ae5a54bf9f Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 14:43:54 -0700
Subject: [PATCH 6/9] ci: use shared workflow main for C++ test cache

---
 .github/workflows/pr.yaml   | 2 +-
 .github/workflows/test.yaml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index 2d8ddb854a8c..e70c76216789 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -305,7 +305,7 @@ jobs:
       packages: read
       pull-requests: read
     secrets: inherit # zizmor: ignore[secrets-inherit]
-    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@codex/caller-cache-directories
+    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@main
     if: fromJSON(needs.changed-files.outputs.changed_file_groups).cpp_build_inputs || fromJSON(needs.changed-files.outputs.changed_file_groups).cpp_test_files || fromJSON(needs.changed-files.outputs.changed_file_groups).test_cpp
     with:
       build_type: pull-request
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index d9bc251bebf4..5fc6cffc40f4 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -47,7 +47,7 @@ jobs:
       packages: read
       pull-requests: read
     secrets: inherit # zizmor: ignore[secrets-inherit]
-    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@codex/caller-cache-directories
+    uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-tests.yaml@main
     with:
       build_type: ${{ inputs.build_type }}
       branch: ${{ inputs.branch }}

From 967fc9fbfcc8e849a452102975592b07df0dd568 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 21:50:38 -0700
Subject: [PATCH 7/9] fix: update libcudf-streaming test dependency version

---
 dependencies.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dependencies.yaml b/dependencies.yaml
index f819941c5e05..d698c29a0f34 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -1137,7 +1137,7 @@ dependencies:
           - libcudf-example==26.12.*,>=0.0.0a0
           - libcudf_kafka==26.12.*,>=0.0.0a0
           - libcudf-tests==26.12.*,>=0.0.0a0
-          - libcudf-streaming-tests==26.10.*,>=0.0.0a0
+          - libcudf-streaming-tests==26.12.*,>=0.0.0a0
   test_python_common:
     common:
       - output_types: [conda, requirements, constraints, pyproject]

From d037d783e09b061c89a4c424825a76f7c7cf6613 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 21:52:05 -0700
Subject: [PATCH 8/9] fix: update libcudf-streaming test version

---
 ci/release/update-version.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ci/release/update-version.sh b/ci/release/update-version.sh
index 3a643b70cd97..7f1982ee4125 100755
--- a/ci/release/update-version.sh
+++ b/ci/release/update-version.sh
@@ -158,6 +158,7 @@ DEPENDENCIES=(
   libcudf
   libcudf-example
   libcudf-streaming
+  libcudf-streaming-tests
   libcudf-tests
   libcudf_kafka
   libkvikio

From 0c7ed31883b34f87d61e6f162111bfc696226d67 Mon Sep 17 00:00:00 2001
From: Vyas Ramasubramani <vyasr@nvidia.com>
Date: Tue, 8 Sep 2026 23:14:54 -0700
Subject: [PATCH 9/9] fix: preload libcudf JIT cache in C++ tests

---
 .github/workflows/pr.yaml   | 4 +++-
 .github/workflows/test.yaml | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index eef2283bf938..be478fc7e77a 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -312,7 +312,9 @@ jobs:
       script: ci/test_cpp.sh
       cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
-      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=.cache/libcudf
+      cache-environment: |
+        LIBCUDF_KERNEL_CACHE_PATH=.cache/libcudf
+        LIBCUDF_KERNEL_CACHE_PRELOAD=1
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-python-build:
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 1793b428575a..396a9f641ca9 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -56,7 +56,9 @@ jobs:
       sha: ${{ inputs.sha }}
       cache-paths: .cache/libcudf
       cache-key-prefix: libcudf-rtcx-v1
-      cache-environment: LIBCUDF_KERNEL_CACHE_PATH=.cache/libcudf
+      cache-environment: |
+        LIBCUDF_KERNEL_CACHE_PATH=.cache/libcudf
+        LIBCUDF_KERNEL_CACHE_PRELOAD=1
       # https://github.com/NVIDIA/cudf/issues/23498
       matrix_filter: map(select(.GPU != "gb300" and .GPU != "gh200"))
   conda-cpp-benchmark-tests: