How to read a large file

[csripriya1]

Hi all,
I want to read in a large file and then split into smaller files as per some pattern. I am using fstream in C++. My executable slows after some time. I am seraching a way to speed up this process. Can any one please help me with this.

My code is as follows.
ifstream inpfile(stra,ios::in);
if(!inpfile)
{
cerr<<"File could not be opened"<<endl;
exit(1);
}


ofstream outfile(outputfile,ios:ut|ios::app);
if(!outfile)
{
cerr<<"File could not be opened"<<endl;
exit(1);
}
.......
in=1;
while(in<=limit1)
{
inpfile.getline(dummy,1000,'\n');
outfile<<dummy<<endl;
in++;
}
............

in=1;
while(in<=limit2)
{
inpfile.getline(dummy,1000,'\n');
outfile<<dummy<<endl;
in++;
}


Thank you very much for your time and effort in advance.

 

[Kalisto]

I cant see anything in the supplied code that would slow down execution progressively.
whast in the ... sections?

Have you tried profiling your code to see what is slowing it down?

K