C++ APP Profiling using Kcachegrind

通过工具Valgrind和Kcachegrind，图形化显示函数调用关系和时间占比 link

1. 安装

sudo apt-get install valgrind kcachegrind graphviz

2. 使用

valgrind --tool=callgrind program [program_options]
kcachegrind callgrind.out.XXX  # open the outputed file

3. 分析

左边界面，列出所有函数，可以搜索特定函数名：

右上部界面，有如下域：

• Types : Present the types of events that have been recorded. In our case, it’s not really interesting, it’s just the number of instructions fetch
• Callers : List of the direct callers
• All Callers : List of all the callers, it seems the callers and the callers of the callers
• Callee Map : A map of the callee, personally, I do not really understand this view, but it’s a kind of call graph representing the cost of the functions
• Source code : The source code of the function if the application has been compiled with the debug symbol(编译-g)

右下部界面，有如下域：

• Callees : The direct callees of the function
• Call Graph : The call graph from the function to the end
• All Callees : All the callees and the callees of the callees
• Caller Map : The map of the caller, again not really understandable for me
• Machine Code : The machine code of the function if the application has been profiled with –dump-instr=yes option