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。
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。
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#include <iostream>
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#include <fstream>
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#include <vector>
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#include <map>
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#include <string>
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#include <sys/time.h>
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using std::vector;
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using std::map;
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using std::string;
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using std::clog;
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using std::endl;
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using std::ofstream;
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using std::ostream;
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extern "c" void print_trace(const char * const procname);
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struct stat
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{
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int lvl;
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string name;
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long stm;
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long etm;
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long oitv;
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stat(int l, const string& s, long st) : lvl(l), name(s), stm(st), etm(0), oitv(0) {}
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};
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struct sum
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{
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int cnt;
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long itv;
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sum() : cnt(0), itv(0) {}
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sum operator=(long i)
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{
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cnt;
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itv=i;
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return *this;
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}
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};
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namespace
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{
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vector<stat> tracev;
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map<string, sum> itvm;
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int clvl = 0;
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bool detailf = (getenv("detailf")!=null);
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}
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extern "c" void
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__func_trace_enter(const char * const proc_name,
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const char * const file_name,
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const int line_no,
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void ** const id)
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{
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// printf("{ %s (%s:%d) %p %s\n", proc_name, file_name, line_no, id[0], (char*)*id);
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struct timeval nowtm;
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gettimeofday(&nowtm, null);
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clvl;
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tracev.push_back(stat(clvl, string(proc_name)"() : "file_name, nowtm.tv_sec * 1000000 nowtm.tv_usec));
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}
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extern "c" void
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__func_trace_exit(const char * const proc_name,
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const char * const file_name,
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const int line_no,
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void ** const id)
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{
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// printf("} %s (%s:%d) %p %s\n", proc_name, file_name, line_no, id[0], (char*)*id);
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struct timeval nowtm;
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int itv;
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gettimeofday(&nowtm, null);
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auto iter = tracev.end() - 1;
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while (iter->etm != 0)
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--iter;
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iter->etm = nowtm.tv_sec * 1000000 nowtm.tv_usec;
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itv = iter->etm - iter->stm - iter->oitv;
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itvm[proc_name]=itv;
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for (auto s = tracev.begin(); s!=iter; s)
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{
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if (s->etm == 0)
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s->oitv = itv;
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}
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--clvl;
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if (!detailf)
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tracev.erase(iter, tracev.end());
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if (clvl == 0)
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{
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print_trace(proc_name);
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tracev.clear();
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itvm.clear();
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}
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}
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extern "c" void print_trace(const char * const procname)
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{
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time_t t;
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char buf[30];
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ofstream logf(getenv("tracelog"), std::ios::app);
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ostream &log = logf ? logf : clog;
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if (detailf)
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{
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log<<"detail of "<< procname <<"() :\n";
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for (auto s = tracev.begin(); s!=tracev.end(); s)
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{
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log << s->lvl << "\t";
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t=s->stm/1000000;
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strftime(buf, sizeof(buf), "%y%m%d%h%m%s", localtime(&t));
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log << buf << "." << s->stm % 1000000 << "\t";
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t=s->etm/1000000;
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strftime(buf, sizeof(buf), "%y%m%d%h%m%s", localtime(&t));
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log << buf << "." << s->etm % 1000000 << "\t";
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log << s->etm-s->stm << "\t" << s->oitv << "\t" << s->etm-s->stm-s->oitv << "\t";
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log << string(s->lvl-1, ' ') << s->name << "\n";
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}
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}
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log<<"total of "<< procname <<"() :\n";
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for (auto s = itvm.begin(); s!=itvm.end(); s)
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{
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log << s->first << "()\t count "<< (s->second).cnt << "\ttime " << (s->second).itv << "\n";
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}
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log<<endl;
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}
设置detailf后,运行后输出结果如下。
detail of main() :
1 20170801152000.103879 20170801152000.104034 155 58 97 main() : tt.c
2 20170801152000.103954 20170801152000.103997 43 3 40 f1() : tt.c
3 20170801152000.103958 20170801152000.103961 3 0 3 f2() : tt.c
2 20170801152000.104017 20170801152000.104032 15 3 12 f1() : tt.c
3 20170801152000.104021 20170801152000.104024 3 0 3 f2() : tt.c
total of main() :
f1() count 2 time 0.000052 s
f2() count 2 time 0.000006 s
main() count 1 time 0.000097 s
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