Merge remote-tracking branch 'source/0.5.1' into 0.5.1

Former-commit-id: f29536b8ff8ac23aa9f629da28825c1efcedcf0b

core/src/index/unittest/CMakeLists.txt

@@ -86,5 +86,6 @@ install(TARGETS test_gpuresource DESTINATION unittest)
 install(TARGETS test_customized_index DESTINATION unittest)
 
 #add_subdirectory(faiss_ori)
+#add_subdirectory(faiss_benchmark)
 add_subdirectory(test_nsg)
 

core/src/index/unittest/faiss_benchmark/CMakeLists.txt

+include_directories(${INDEX_SOURCE_DIR}/thirdparty)
+include_directories(${INDEX_SOURCE_DIR}/include)
+include_directories(/usr/local/cuda/include)
+include_directories(/usr/local/hdf5/include)
+
+link_directories(/usr/local/cuda/lib64)
+link_directories(/usr/local/hdf5/lib)
+
+set(unittest_libs
+        gtest gmock gtest_main gmock_main)
+
+set(depend_libs
+        faiss openblas lapack hdf5
+        arrow ${ARROW_PREFIX}/lib/libjemalloc_pic.a
+        )
+
+set(basic_libs
+        cudart cublas
+        gomp gfortran pthread
+        )
+
+add_executable(test_faiss_benchmark faiss_benchmark_test.cpp)
+target_link_libraries(test_faiss_benchmark ${depend_libs} ${unittest_libs} ${basic_libs})
+install(TARGETS test_faiss_benchmark DESTINATION unittest)

core/src/index/unittest/faiss_benchmark/README.md

+### To run this FAISS benchmark, please follow these steps:
+ 
+#### Step 1:
+Download the HDF5 source from:
+  https://support.hdfgroup.org/ftp/HDF5/releases/
+and build/install to "/usr/local/hdf5".
+
+#### Step 2:
+Download HDF5 data files from:
+  https://github.com/erikbern/ann-benchmarks
+
+#### Step 3:
+Update 'milvus/core/src/index/unittest/CMakeLists.txt',
+uncomment "#add_subdirectory(faiss_benchmark)".
+
+#### Step 4:
+Build Milvus with unittest enabled: "./build.sh -t Release -u",
+binary 'test_faiss_benchmark' will be generated.
+
+#### Step 5:
+Put HDF5 data files into the same directory with binary 'test_faiss_benchmark'.
+
+#### Step 6:
+Run test binary 'test_faiss_benchmark'.
+