AIX下C/C++函数性能统计实现方法--改进版-创新互联

上一篇实现,是统计了每一次函数调用的层次关系和耗时。如果在函数调用比较多的情况下,更关心的是减少输出,只需要总计的耗时即可。另外如果是后台程序,输出到文件会更好。

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因此,对程序做了改进。当设置TRACELOG环境变量,则输出到这个环境变量指定的文件中。如果设置了DETAILF,则会输出调用层次关系和每一次的耗时,否则只输出总计时间。

tr.cpp改进后的程序如下。

  • #include
  • #include
  • #include
  • #include
  • #include
  • #include

  • using std::vector;
  • using std::map;
  • using std::string;
  • using std::clog;
  • using std::endl;
  • using std::ofstream;
  • using std::ostream;

  • extern "C" void print_trace(const char * const procname);

  • struct Stat
  • {
  •     int lvl;
  •     string name;
  •     long stm;
  •     long etm;
  •     long oitv;
  •     Stat(int l, const string& s, long st) : lvl(l), name(s), stm(st), etm(0), oitv(0) {}
  • };

  • struct Sum
  • {
  •     int cnt;
  •     long itv;
  •     Sum() : cnt(0), itv(0) {}
  •     Sum operator+=(long i)
  •     {
  •         ++cnt;
  •         itv+=i;
  •         return *this;
  •     }
  • };

  • namespace
  • {
  • vector tracev;
  • map itvm;
  • int clvl = 0;
  • bool detailf = (getenv("DETAILF")!=NULL);
  • }

  • extern "C" void
  • __func_trace_enter(const char * const proc_name,
  •                    const char * const file_name,
  •                    const int line_no,
  •                    void ** const id)
  • {
  • // printf("{ %s (%s:%d) %p %s\n", proc_name, file_name, line_no, id[0], (char*)*id);
  •     struct timeval nowtm;
  •     gettimeofday(&nowtm, NULL);
  •     ++clvl;
  •     tracev.push_back(Stat(clvl, string(proc_name)+"() : "+file_name, nowtm.tv_sec * 1000000 + nowtm.tv_usec));
  • }

  • extern "C" void
  • __func_trace_exit(const char * const proc_name,
  •                   const char * const file_name,
  •                   const int line_no,
  •                   void ** const id)
  • {
  • // printf("} %s (%s:%d) %p %s\n", proc_name, file_name, line_no, id[0], (char*)*id);
  •     struct timeval nowtm;
  •     int itv;
  •     gettimeofday(&nowtm, NULL);
  •     auto iter = tracev.end() - 1;
  •     while (iter->etm != 0)
  •         --iter;
  •     iter->etm = nowtm.tv_sec * 1000000 + nowtm.tv_usec;
  •     itv = iter->etm - iter->stm - iter->oitv;
  •     itvm[proc_name]+=itv;
  •     for (auto s = tracev.begin(); s!=iter; ++s)
  •     {
  •         if (s->etm == 0)
  •             s->oitv += itv;
  •     }
  •     --clvl;
  •     if (!detailf)
  •         tracev.erase(iter, tracev.end());
  •     if (clvl == 0)
  •     {
  •         print_trace(proc_name);
  •         tracev.clear();
  •         itvm.clear(); 
  •     }
  • }

  • extern "C" void print_trace(const char * const procname)
  • {
  •     time_t t;
  •     char buf[30];
  •     ofstream logf(getenv("TRACELOG"), std::ios::app);
  •     ostream &log = logf ? logf : clog;
  •     if (detailf)
  •     {
  •         log<<"Detail of "<< procname <<"() :\n";
  •         for (auto s = tracev.begin(); s!=tracev.end(); ++s)
  •         {
  •             log << s->lvl << "\t";
  •             t=s->stm/1000000;
  •             strftime(buf, sizeof(buf), "%Y%m%d%H%M%S", localtime(&t));
  •             log << buf << "." << s->stm % 1000000 << "\t";
  •             t=s->etm/1000000;
  •             strftime(buf, sizeof(buf), "%Y%m%d%H%M%S", localtime(&t));
  •             log << buf << "." << s->etm % 1000000 << "\t";
  •             log << s->etm-s->stm << "\t" << s->oitv << "\t" << s->etm-s->stm-s->oitv << "\t";
  •             log << string(s->lvl-1, ' ') << s->name << "\n";
  •         }
  •     }
  •     log<<"Total of "<< procname <<"() :\n";
  •     for (auto s = itvm.begin(); s!=itvm.end(); ++s)
  •     {
  •         log << s->first << "()\t count "<< (s->second).cnt << "\ttime " << (s->second).itv << "\n";
  •     }
  •     log<
  • }

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