ci : run test-backend-ops as a dedicated ci/run.sh test (#28740)

* ci : run test-backend-ops as a dedicated gg test

Run test-backend-ops as a separate gg test in ci/run.sh so it is executed outside ctest. With GG_BUILD_HIGH_PERF it keeps the existing CPU-only invocation (-b CPU); otherwise it runs all available backends without a backend filter.

Remove the dedicated backend-ops workflow and keep test-backend-ops as a built target that is not registered with ctest to avoid duplicate runs.

Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-Vision-Exp

* ci : run test-backend-ops earlier and enable high-perf on kleidiai

Move the test-backend-ops gg test before test-llama-archs.

Enable GG_BUILD_HIGH_PERF and LLAMA_ARG_THREADS on the Graviton4 KleidiAI job and use the standard self-hosted results/mnt paths.

Add TODO markers for decoupling tests from libllama.

Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-Vision-Exp

* ci : run test-backend-ops in parallel

Pass -j $(nproc) to test-backend-ops in both high-perf and all-backend modes.

Assisted-by: pi:llama.cpp/DeepSeek-V4-Flash-Vision-Exp

* ci : disable parallel tests for ROCm

* cont : disable parallel tests with MoltenVK

.github/workflows/build-openvino.yml

@@ -33,7 +33,7 @@ env:
   LLAMA_ARG_LOG_PREFIX: 1
   LLAMA_ARG_LOG_TIMESTAMPS: 1
   # TODO: fix failing tests on OpenVINO backend
-  CTEST_EXCLUDE: "test-llama-archs|^test-recurrent-state-|test-backend-ops|test-save-load-state"
+  CTEST_EXCLUDE: "test-llama-archs|^test-recurrent-state-|test-save-load-state"
 
 jobs:
   ubuntu-24-openvino:

.github/workflows/build-self-hosted.yml

@@ -395,7 +395,11 @@ jobs:
       - name: Test
         id: ggml-ci
         run: |
-          LLAMA_ARG_THREADS=$(nproc) GG_BUILD_HIGH_PERF=1 GG_BUILD_NO_BF16=1 GG_BUILD_EXTRA_TESTS_0=1 bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp
+          LLAMA_ARG_THREADS=$(nproc) \
+          GG_BUILD_HIGH_PERF=1 \
+          GG_BUILD_NO_BF16=1 \
+          GG_BUILD_EXTRA_TESTS_0=1 \
+          bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp
 
   cpu-arm64-graviton4-kleidiai:
     runs-on: ah-ubuntu_22_04-c8g_8x
@@ -434,6 +438,8 @@ jobs:
       - name: Test
         id: ggml-ci
         run: |
+          LLAMA_ARG_THREADS=$(nproc) \
           GG_BUILD_KLEIDIAI=1 \
           GG_BUILD_EXTRA_TESTS_0=1 \
-          bash ./ci/run.sh ./tmp/results ./tmp/mnt
+          GG_BUILD_HIGH_PERF=1 \
+          bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp

.github/workflows/build-vulkan.yml

@@ -164,9 +164,7 @@ jobs:
           export GGML_VK_VISIBLE_DEVICES=0
           export GGML_VK_DISABLE_F16=1
           export GGML_VK_DISABLE_COOPMAT=1
-          # This is using llvmpipe and runs slower than other backends
-          # test-backend-ops is too slow on llvmpipe, skip it
-          ctest -L main -E test-backend-ops --verbose --timeout 900
+          ctest -L main --verbose --timeout 900
 
   windows:
     runs-on: windows-2025

.github/workflows/build-webgpu.yml

@@ -190,6 +190,4 @@ jobs:
         id: cmake_test
         run: |
           cd build
-          # This is using llvmpipe and runs slower than other backends
-          # test-backend-ops is too slow on llvmpipe, skip it
-          ctest -L main -E test-backend-ops --verbose --timeout 900
+          ctest -L main --verbose --timeout 900