update: add note how to use gperf tools

_posts/2024-06-21-gperf-tools.md

@@ -0,0 +1,72 @@
+---
+title: 使用gperftools进行性能分析
+date: 2024-06-21 +0800 # 2022-01-01 13:14:15 +0800 只写日期也行；不写秒也行；这样也行 2022-03-09T00:55:42+08:00
+categories: [cpp]
+tags: [cpp]      # TAG names should always be lowercase
+
+# 以下默认false
+math: true
+mermaid: true
+# pin: true
+---
+
+## 1. 安装 gperftools
+
+使用 [gperftools Release页面](https://github.com/gperftools/gperftools/releases/tag/gperftools-2.9.1) 下载（不要使用git clone，且不要使用cmake编译，编译不生成`pprof`工具），编译命令：
+
+```bash
+./configure
+make && make install
+```
+
+## 2. 将 gperftools 链接进待测试程序
+
+如何在`CMake`中查找`gperftools`的路径，参考笔记 [CMake 编写FindPackage 模块](./2024-06-21-cmake-find_package.md)，添加自定义CMake Find Package模块，并在`CMakeLists.txt`中添加`find_package(gperftools)`，即可找到`gperftools`的路径。
+
+编译脚本添加如下：
+
+```cmake
+option(ENABLE_PROFILER "Enable google perftools" ON)
+message(STATUS "ENABLE_PROFILER: ${ENABLE_PROFILER}")
+if(ENABLE_PROFILER)
+  set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake;${CMAKE_MODULE_PATH}")
+  find_package(Gperftools REQUIRED)
+  set(PROFILER_LIBS ${GPERFTOOLS_PROFILER_LIBRARY})
+  message(STATUS "PROFILER_LIBS: ${PROFILER_LIBS}")
+  add_definitions("-DHAVE_PROFILER")
+else()
+  set(PROFILER_LIBS "")
+endif()
+```
+
+使能frame-pointer：
+
+```cmake
+if(ENABLE_PROFILER)
+  message(STATUS "enable profiler")
+  target_compile_options(${target_test} PRIVATE -pg -fno-omit-frame-pointer)
+  target_link_options(${target_test} PRIVATE -pg -fno-omit-frame-pointer)
+  # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-omit-frame-pointer")
+  # set(CMAKE_LINKER_FLAGS "${CMAKE_LINKER_FLAGS} -fno-omit-frame-pointer")
+endif()
+```
+
+## 3. 使用 gperftools 分析程序性能
+
+运行被测试程序：
+
+```bash
+CPUPROFILE=test_flow_benchmark.prof CPUPROFILE_FREQUENCY=500 ./test --gtest_filter=FlowBenchMarkTest10/FlowBenchMarkTest.*
+
+# 生成pdf报告
+pprof --pdf ./server server.prof > perf.pdf
+```
+
+## 参考
+
+1. [gperftools](https://github.com/gperftools/gperftools)
+2. [gperftools文档 --  CPU profiler](https://gperftools.github.io/gperftools/cpuprofile.html)
+3. [使用 gperftools 分析程序性能](https://luyuhuang.tech/2022/04/10/gperftools.html)
+4. [Profiler -- 链接选项](https://github.com/cat538/cat538.github.io/blob/6689abc6d7785a8be3d7a71a3cd76eea207e1d72/docs/cpp/profiler.md)
+5. [Linux下使用gperftools](https://blog.wangluyuan.cc/2019/03/23/Linux%E4%B8%8B%E4%BD%BF%E7%94%A8gperftools/)
+6. [gperftools 的安装与使用](https://xiang1120.github.io/2023/08/19/gperftools%E7%9A%84%E5%AE%89%E8%A3%85%E4%B8%8E%E4%BD%BF%E7%94%A8/)