void Util::logFile21(string fileName)
{
fstream wFile(fileName, ios::app);
if (!wFile.is_open())
{
cout << "Create or open " << fileName << " failed!" << endl;
return;
}
int loops = 200, repeatedTimes = 1000000;
stringstream ss;
long double num = 0;
for (int i = 0; i < loops; i++)
{
for (int j = 0; j < repeatedTimes; j++)
{
ss << fixed << ++num << "," << getUuid27() << endl;
}
wFile << ss.str();
ss = stringstream();
cout << fixed << "Num=" << num << ",now is " << getTimeNow() << endl;
}
wFile.close();
cout << "Finished in void Util::logFile21(string fileName) and now is " << getTimeNow() << endl;
}
char *Util::getUuid27()
{
uuid_t newUUID;
uuid_generate(newUUID);
uuid_unparse(newUUID, Util::uuidValue);
return Util::uuidValue;
}
g++ -g -std=c++2a -I. *.cpp ./Model/*.cpp -o h1 -luuid -lpthread
![](https://img2022.cnblogs.com/blog/947244/202203/947244-20220319174427966-889407106.png)
void Util::readFile22(string fileName)
{
fstream rFile(fileName, ios::in);
if (!rFile.is_open())
{
cout << "Open " << fileName << " failed!" << endl;
return;
}
long double num = 0;
string line;
while (getline(rFile, line))
{
if (!fmod(++num, 1000000))
{
cout << fixed << "Num=" << num << ",value=" << line << ",now is " << getTimeNow() << endl;
}
}
rFile.clear();
rFile.close();
cout << "Finished in void Util::readFile22(string fileName) and now is " << getTimeNow() << endl;
}
![](https://img2022.cnblogs.com/blog/947244/202203/947244-20220319180331179-2098123552.png)