如何使用KCachegrind和Callgrind只测量我的代码的一部分？ [英] How to use KCachegrind and Callgrind to measure only parts of my code?

问题描述

我想使用 valgrind 来分析我的代码。问题是，我有一个巨大的启动序列，我不感兴趣。

我在 valgrind / callgrind.h

CALLGRIND_STOP_INSTRUMENTATION

CALLGRIND_DUMP_STATS

根据本文我必须使用以下选项执行 valgrind ：

valgrind --tool = callgrind --instr-atstart = no ./application

当创建这两个文件时， p>

• callgrind.out.16060


• callgrind.out.16060.1

然后我想使用kcachegrind可视化我的结果。这工作很好，但是我的启动顺序跳过的makros似乎什么也没做。

解决方案

现在我已经知道了， '不是100％肯定为什么。我将尝试描述我的代码有点：

我有一个Application类，负责很多子系统。在我最初的尝试中，我试图测量应用程序内的性能，如下所示：

  int main（int argc，char * argv [ ]）
 {
应用程序a（argc，argv）; 
 return a.exec（）; 
} 
 
 void Application :: Application（int& argc，char ** argv）
 {
 m_pComplexSystem = new ComplexSystem 
 m_pComplexSystem-> configure（）; 
 
 CALLGRIND_START_INSTRUMENTATION; 
 m_Configurator-> start（）; 
} 
 
应用程序::〜Application（）
 {
 CALLGRIND_STOP_INSTRUMENTATION; 
 CALLGRIND_DUMP_STATS; 
 m_pComplexSystem  - > stop（）; 
 
 delete m_pComplexSystem; 
 m_pComplexSystem = 0; 
} 
  

由于某些原因，定义被忽略，我得到了整体的性能度量构造函数和在ComplexSystem成员的configure（）调用中完成的一切。

现在我使用这个似乎工作的代码：

  int main（int argc，char * argv []）
 {
应用程序（argc，argv）; 
 
 CALLGRIND_START_INSTRUMENTATION; 
 int result = a.exec（）; 
 CALLGRIND_STOP_INSTRUMENTATION; 
 CALLGRIND_DUMP_STATS; 
 return result; 
} 
  

虽然它与我原来的尝试不完全一样，适用于慢速功能。

I want to use valgrind to analyze my code. The problem is, that I have a huge startup sequence which I'm not interested in.

I found defines in the valgrind/callgrind.h that should help me:

• CALLGRIND_START_INSTRUMENTATION
• CALLGRIND_STOP_INSTRUMENTATION
• CALLGRIND_DUMP_STATS

According to this article I have to execute valgrind with the following options:

valgrind --tool=callgrind --instr-atstart=no ./application

When I do this two files are created:

• callgrind.out.16060
• callgrind.out.16060.1

I then want to use kcachegrind to visualize my results. This works great but the makros for the skipping of my startup-sequence seem to do nothing. What do I have to do to measure the performance only in places where I want to?

解决方案

I got it now, but I'm not 100% sure why. I will try to describe my code a bit:

I have an Application class that is responsible for a lot of subsystems. In my original attempt I tried to measure the performance inside the Application like this:

int main(int argc, char *argv[])
{
    Application a(argc, argv);
    return a.exec();
}

void Application::Application(int &argc, char **argv)
{
    m_pComplexSystem = new ComplexSystem();
    m_pComplexSystem->configure();

    CALLGRIND_START_INSTRUMENTATION;
    m_Configurator->start();    
}

Application::~Application()
{
    CALLGRIND_STOP_INSTRUMENTATION;
    CALLGRIND_DUMP_STATS;
    m_pComplexSystem ->stop();

    delete m_pComplexSystem;
    m_pComplexSystem = 0;
}

For some reason the defines were ignored and I got the performance measures of the whole constructor and everything that was done in the configure() call of the ComplexSystem member.

So now I use this code that seems to work:

int main(int argc, char *argv[])
{
    Application a(argc, argv);

    CALLGRIND_START_INSTRUMENTATION;
    int result = a.exec();
    CALLGRIND_STOP_INSTRUMENTATION;
    CALLGRIND_DUMP_STATS;
    return result;
}

Although it is not exactly the same as my original attempt, I can start looking for slow functions now.

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