ci : add self-hosted webgpu to hf-jobs (#28712)

* add self-hosted vulkan and webgpu to hf-jobs

* try t4-medium

* cont : adjust cpu backend threads

* try t4-small again

* restore cm jobs

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

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

@@ -124,6 +124,7 @@ jobs:
           GG_BUILD_ROCM=1 GG_BUILD_AMDGPU_TARGETS=gfx1151 bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp
 
   gpu-vulkan-nvidia-cm:
+    # runs-on: "hf-jobs-t4-small:ubuntu26_04"
     runs-on: [self-hosted, Linux, NVIDIA]
 
     steps:
@@ -131,13 +132,44 @@ jobs:
         id: checkout
         uses: actions/checkout@v6
 
+      # - name: Install dependencies
+      #   run: |
+      #     sudo apt update
+      #     sudo apt install -y build-essential cmake libxcb-xinput0 libxcb-xinerama0 libxcb-cursor-dev libvulkan-dev glslc spirv-headers vulkan-tools mesa-vulkan-drivers libglvnd0 libgl1 libglx0 libegl1 libgles2 libssl-dev time unzip wget python3 python3-venv python3-pip
+
+      # - name: ccache
+      #   uses: ggml-org/ccache-action@v1.2.24
+      #   with:
+      #     restore: false
+      #     save: false
+
+      # - name: ccache-buckets-restore
+      #   uses: ./.github/actions/ccache-buckets
+      #   with:
+      #     key: self-hosted-vulkan-nvidia-cm
+      #     folder: llama.cpp
+      #     hf_bucket: ggml-org/cache
+
       - name: Test
         id: ggml-ci
         run: |
           vulkaninfo --summary
           GG_BUILD_VULKAN=1 GGML_VK_DISABLE_COOPMAT2=1 bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp
 
+      # - name: ccache-buckets-save
+      #   if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+      #   uses: ./.github/actions/ccache-buckets
+      #   env:
+      #     HF_TOKEN: ${{ secrets.HF_TOKEN_CACHE_OUTPUT }}
+      #   with:
+      #     key: self-hosted-vulkan-nvidia-cm
+      #     folder: llama.cpp
+      #     evict-old-files: 1d
+      #     hf_bucket: ggml-org/cache
+      #     save: true
+
   gpu-vulkan-nvidia-cm2:
+    # runs-on: "hf-jobs-t4-small:ubuntu26_04"
     runs-on: [self-hosted, Linux, NVIDIA, COOPMAT2]
 
     steps:
@@ -145,20 +177,68 @@ jobs:
         id: checkout
         uses: actions/checkout@v6
 
+      # - name: Install dependencies
+      #   run: |
+      #     sudo apt update
+      #     sudo apt install -y build-essential cmake libxcb-xinput0 libxcb-xinerama0 libxcb-cursor-dev libvulkan-dev glslc spirv-headers vulkan-tools mesa-vulkan-drivers libglvnd0 libgl1 libglx0 libegl1 libgles2 libssl-dev time unzip wget python3 python3-venv python3-pip
+
+      # - name: ccache
+      #   uses: ggml-org/ccache-action@v1.2.24
+      #   with:
+      #     restore: false
+      #     save: false
+
+      # - name: ccache-buckets-restore
+      #   uses: ./.github/actions/ccache-buckets
+      #   with:
+      #     key: self-hosted-vulkan-nvidia-cm2
+      #     folder: llama.cpp
+      #     hf_bucket: ggml-org/cache
+
       - name: Test
         id: ggml-ci
         run: |
           vulkaninfo --summary
           GG_BUILD_VULKAN=1 bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp
 
+      # - name: ccache-buckets-save
+      #   if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+      #   uses: ./.github/actions/ccache-buckets
+      #   env:
+      #     HF_TOKEN: ${{ secrets.HF_TOKEN_CACHE_OUTPUT }}
+      #   with:
+      #     key: self-hosted-vulkan-nvidia-cm2
+      #     folder: llama.cpp
+      #     evict-old-files: 1d
+      #     hf_bucket: ggml-org/cache
+      #     save: true
+
   gpu-webgpu-nvidia:
-    runs-on: [self-hosted, Linux, NVIDIA, X64]
+    runs-on: "hf-jobs-t4-small:ubuntu26_04"
 
     steps:
       - name: Clone
         id: checkout
         uses: actions/checkout@v6
 
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y build-essential cmake libxcb-xinput0 libxcb-xinerama0 libxcb-cursor-dev libvulkan1 mesa-vulkan-drivers libglvnd0 libgl1 libglx0 libegl1 libgles2 libssl-dev time unzip wget python3 python3-venv python3-pip
+
+      - name: ccache
+        uses: ggml-org/ccache-action@v1.2.24
+        with:
+          restore: false
+          save: false
+
+      - name: ccache-buckets-restore
+        uses: ./.github/actions/ccache-buckets
+        with:
+          key: self-hosted-webgpu-nvidia
+          folder: llama.cpp
+          hf_bucket: ggml-org/cache
+
       - name: Dawn Dependency
         id: dawn-depends
         run: |
@@ -180,6 +260,18 @@ jobs:
           GG_BUILD_WEBGPU_DAWN_DIR="$GITHUB_WORKSPACE/dawn/lib64/cmake/Dawn" \
             bash ./ci/run.sh ~/results/llama.cpp ~/mnt/llama.cpp
 
+      - name: ccache-buckets-save
+        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+        uses: ./.github/actions/ccache-buckets
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN_CACHE_OUTPUT }}
+        with:
+          key: self-hosted-webgpu-nvidia
+          folder: llama.cpp
+          evict-old-files: 1d
+          hf_bucket: ggml-org/cache
+          save: true
+
   # TODO: provision AMX-compatible machine
   #cpu-amx:
   #  runs-on: [self-hosted, Linux, CPU, AMX]

tests/test-backend-ops.cpp

@@ -12000,8 +12000,7 @@ int main(int argc, char ** argv) {
         ggml_backend_reg_t reg = ggml_backend_dev_backend_reg(dev);
         auto ggml_backend_set_n_threads_fn = (ggml_backend_set_n_threads_t) ggml_backend_reg_get_proc_address(reg, "ggml_backend_set_n_threads");
         if (ggml_backend_set_n_threads_fn) {
-            // TODO: better value for n_threads
-            ggml_backend_set_n_threads_fn(backend.get(), N_THREADS);
+            ggml_backend_set_n_threads_fn(backend.get(), std::max<int>(1, N_THREADS/2));
         }
 
         size_t free, total;  // NOLINT