chore: import upstream snapshot with attribution

test/cpp/phi/memory/compact_allocator_test.cc

@@ -0,0 +1,43 @@
+// Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "paddle/phi/core/memory/allocation/allocator.h"
+#include "paddle/phi/core/memory/allocation/cuda_virtual_mem_allocator.h"
+#include "paddle/phi/core/memory/allocation/retry_allocator.h"
+#include "paddle/phi/core/memory/allocation/virtual_memory_auto_growth_best_fit_allocator.h"
+#include "paddle/phi/core/platform/device/gpu/gpu_info.h"
+#ifdef PADDLE_WITH_CUDA
+#include <cuda.h>
+#include <cuda_runtime.h>
+#endif
+#include "gtest/gtest.h"
+namespace paddle {
+namespace memory {
+namespace allocation {
+
+TEST(VirtualMemoryAutoGrowthBestFitAllocator, TestCompact) {
+  auto vmm_cuda_allocator =
+      std::make_shared<CUDAVirtualMemAllocator>(phi::GPUPlace());
+  auto vma_allocator =
+      std::make_shared<VirtualMemoryAutoGrowthBestFitAllocator>(
+          vmm_cuda_allocator, platform::GpuMinChunkSize(), phi::GPUPlace());
+  size_t mb = (1 << 20);
+  vma_allocator->Allocate(1 * mb);
+  vma_allocator->Allocate(2 * mb);
+  vma_allocator->Compact(phi::GPUPlace());
+}
+
+}  // namespace allocation
+}  // namespace memory
+}  // namespace paddle