update: update note gperf tools

hxf0223 · Jun 24, 2024 · 5765a5d · 5765a5d
1 parent d23716a
commit 5765a5d
Showing 1 changed file with 11 additions and 2 deletions.
diff --git a/_posts/2024-06-21-gperf-tools.md b/_posts/2024-06-21-gperf-tools.md
@@ -44,8 +44,8 @@ endif()
 ```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)
+  target_compile_options(${target_test} PRIVATE -fno-omit-frame-pointer)
+  target_link_options(${target_test} PRIVATE -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()
@@ -62,6 +62,15 @@ CPUPROFILE=test_flow_benchmark.prof CPUPROFILE_FREQUENCY=500 ./test --gtest_filt
 pprof --pdf ./server server.prof > perf.pdf
 ```
 
+## 4. 使用 GNU gprof 分析程序性能
+
+```cmake
+target_compile_options(${target_test} PRIVATE -pg -g)
+  target_link_options(${target_test} PRIVATE -pg -g)
+```
+
+gprof 不支持多线程应用，多线程下只能采集主线程性能数据。多线程需要重写`pthread_create()`。参考：[Linux性能优化gprof使用](https://www.cnblogs.com/youxin/p/7988479.html) 。
+
 ## 参考
 
 1. [gperftools](https://github.com/gperftools/gperftools)