Add google benchmark library with example

Signed-off-by: Bogdan Vaneev <[email protected]>

.gitignore

@@ -29,4 +29,5 @@ include/generated/*
 .scannerwork/
 iroha.conf
 peers.list
+cmake-build*
 

CMakeLists.txt

@@ -64,10 +64,6 @@ if(TESTING)
   add_subdirectory(test)
 endif()
 
-if(BENCHMARKING)
-  add_subdirectory(benchmark)
-endif()
-
 if (FUZZING)
   if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     add_subdirectory(fuzz)

cmake/Modules/Findbenchmark.cmake

@@ -0,0 +1,35 @@
+add_library(benchmark UNKNOWN IMPORTED)
+
+find_path(benchmark_INCLUDE_DIR benchmark/benchmark.h)
+mark_as_advanced(benchmark_INCLUDE_DIR)
+
+find_library(benchmark_LIBRARY benchmark)
+mark_as_advanced(benchmark_LIBRARY)
+
+find_package(PackageHandleStandardArgs REQUIRED)
+find_package_handle_standard_args(benchmark DEFAULT_MSG
+    benchmark_INCLUDE_DIR
+    benchmark_LIBRARY
+    )
+
+if (NOT benchmark_FOUND)
+  externalproject_add(google_benchmark
+      GIT_REPOSITORY https://github.com/google/benchmark
+      GIT_TAG 'v1.2.0'
+      INSTALL_COMMAND "" # remove install step
+      TEST_COMMAND "" # remove test step
+      UPDATE_COMMAND "" # remove update step
+      )
+  externalproject_get_property(google_benchmark binary_dir)
+  set(benchmark_INCLUDE_DIR ${binary_dir}/include)
+  set(benchmark_LIBRARY ${binary_dir}/lib/libbenchmark.a)
+  file(MAKE_DIRECTORY ${benchmark_INCLUDE_DIR})
+
+  add_dependencies(benchmark google_benchmark)
+endif ()
+
+set_target_properties(benchmark PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES ${benchmark_INCLUDE_DIR}
+    IMPORTED_LOCATION ${benchmark_LIBRARY}
+    INTERFACE_LINK_LIBRARIES "pthread"
+    )

cmake/dependencies.cmake

@@ -75,4 +75,14 @@ find_package(tbb)
 ##########################
 # boost multiprecision   #
 ##########################
-find_package(Boost REQUIRED COMPONENTS filesystem)
+find_package(Boost REQUIRED
+    COMPONENTS
+    filesystem
+    system
+    )
+
+
+##########################
+#       benchmark        #
+##########################
+find_package(benchmark)

test/CMakeLists.txt

@@ -3,3 +3,7 @@ SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/test_bin)
 add_subdirectory(module)
 add_subdirectory(framework)
 add_subdirectory(integration)
+
+if(BENCHMARKING)
+  add_subdirectory(benchmark)
+endif()

test/benchmark/CMakeLists.txt

@@ -0,0 +1,7 @@
+# directory contains benchmarks
+add_executable(benchmark_example
+    benchmark_example.cpp
+    )
+target_link_libraries(benchmark_example
+    benchmark
+    )

test/benchmark/benchmark_example.cpp

@@ -0,0 +1,47 @@
+/**
+ * Copyright Soramitsu Co., Ltd. 2017 All Rights Reserved.
+ * http://soramitsu.co.jp
+ *
+ * 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.
+ */
+
+///
+/// Documentation is at https://github.com/google/benchmark
+///
+/// General recommendations:
+///  - build with -DCMAKE_BUILD_TYPE=Release
+///  - disable CPU scaling (frequency changes depending on workload)
+///  - put initialization code in fixtures
+///  - write meaningful names for benchmarks
+///
+
+#include <benchmark/benchmark.h>
+#include <string>
+
+/// Test how long is empty std::string creation
+// define a static function, which accepts 'state'
+// function's name = benchmark's name
+static void BM_StringCreation(benchmark::State &state) {
+  // define main benchmark loop
+  while (state.KeepRunning()) {
+    // define the code to be tested
+    std::string empty_string;
+  }
+}
+// define benchmark
+BENCHMARK(BM_StringCreation);
+
+/// That's all. More in documentation.
+
+// don't forget to include this:
+BENCHMARK_MAIN();