Add SpanId benchmark. (open-telemetry#33)

CMakeLists.txt

@@ -14,6 +14,7 @@ find_package(Threads)
 
 if(BUILD_TESTING)
   find_package(GTest REQUIRED)
+  find_package(benchmark REQUIRED)
   include_directories(SYSTEM ${GTEST_INCLUDE_DIRS})
 endif()
 

WORKSPACE

@@ -24,3 +24,12 @@ http_archive(
     strip_prefix = "googletest-release-1.10.0",
     urls = ["https://github.com/google/googletest/archive/release-1.10.0.tar.gz"],
 )
+
+# Google Benchmark library.
+# Only needed for benchmarks, not to build the OpenTelemetry library.
+http_archive(
+    name = "com_github_google_benchmark",
+    sha256 = "3c6a165b6ecc948967a1ead710d4a181d7b0fbcaa183ef7ea84604994966221a",
+    strip_prefix = "benchmark-1.5.0",
+    urls = ["https://github.com/google/benchmark/archive/v1.5.0.tar.gz"],
+)

api/test/trace/BUILD

@@ -9,6 +9,17 @@ cc_test(
     ],
 )
 
+cc_binary(
+    name = "span_id_benchmark",
+    srcs = [
+        "span_id_benchmark.cc",
+    ],
+    deps = [
+        "//api",
+        "@com_github_google_benchmark//:benchmark",
+    ],
+)
+
 cc_test(
     name = "span_id_test",
     srcs = [

api/test/trace/CMakeLists.txt

@@ -1,10 +1,12 @@
-include(GoogleTest)
-
 add_executable(noop_test noop_test.cc)
 target_link_libraries(noop_test ${GTEST_BOTH_LIBRARIES}
                       ${CMAKE_THREAD_LIBS_INIT} opentelemetry_api)
 gtest_add_tests(TARGET noop_test TEST_PREFIX trace. TEST_LIST noop_test)
 
+add_executable(span_id_benchmark span_id_benchmark.cc)
+target_link_libraries(span_id_benchmark benchmark::benchmark
+                      ${CMAKE_THREAD_LIBS_INIT} opentelemetry_api)
+
 add_executable(span_id_test span_id_test.cc)
 target_link_libraries(span_id_test ${GTEST_BOTH_LIBRARIES}
                       ${CMAKE_THREAD_LIBS_INIT} opentelemetry_api)

api/test/trace/span_id_benchmark.cc

@@ -0,0 +1,52 @@
+#include "opentelemetry/trace/span_id.h"
+
+#include <benchmark/benchmark.h>
+#include <cstdint>
+
+namespace
+{
+using opentelemetry::trace::SpanId;
+constexpr uint8_t bytes[] = {1, 2, 3, 4, 5, 6, 7, 8};
+
+void BM_SpanIdDefaultConstructor(benchmark::State &state)
+{
+  while (state.KeepRunning())
+  {
+    benchmark::DoNotOptimize(SpanId());
+  }
+}
+BENCHMARK(BM_SpanIdDefaultConstructor);
+
+void BM_SpanIdConstructor(benchmark::State &state)
+{
+  while (state.KeepRunning())
+  {
+    benchmark::DoNotOptimize(SpanId(bytes));
+  }
+}
+BENCHMARK(BM_SpanIdConstructor);
+
+void BM_SpanIdToLowerBase16(benchmark::State &state)
+{
+  SpanId id(bytes);
+  char buf[SpanId::kSize * 2];
+  while (state.KeepRunning())
+  {
+    id.ToLowerBase16(buf);
+    benchmark::DoNotOptimize(buf);
+  }
+}
+BENCHMARK(BM_SpanIdToLowerBase16);
+
+void BM_SpanIdIsValid(benchmark::State &state)
+{
+  SpanId id(bytes);
+  while (state.KeepRunning())
+  {
+    benchmark::DoNotOptimize(id.IsValid());
+  }
+}
+BENCHMARK(BM_SpanIdIsValid);
+
+}  // namespace
+BENCHMARK_MAIN();

ci/setup_cmake.sh

@@ -4,6 +4,7 @@ set -e
 
 apt-get install --no-install-recommends --no-install-suggests -y \
                 cmake \
+                libbenchmark-dev \
                 libgtest-dev
 
 # Follows these instructions for setting up gtest

ci/setup_windows_ci_environment.ps1

@@ -6,4 +6,5 @@ cd vcpkg
 $VCPKG_DIR=(Get-Item -Path ".\").FullName
 ./bootstrap-vcpkg.bat
 ./vcpkg integrate install
+./vcpkg install benchmark:x64-windows
 ./vcpkg install gtest:x64-windows