memory leak w/out variable allocation

[bjfcom]

I keep getting a huge memory leak with the g++ compiler (v. 4.4.1), as can be seen from the command "top" which shows "used" memory on my 16GB machine running Ubuntu.
I never use the constructors or destructors (new, or delete). I am, however, dealing with a very large input file (6.6GBs).

I'm still quite a beginner with programming in c++, but after much google searching, I do not understand why this is happening?

Thanks in advance.

#include<iostream>
#include<fstream>
#include<cstdlib>
#include<cstring>
#include<cmath>

using namespace std;

int main()
{

  ifstream DATAIN;
  ofstream DATAOUT;
  int i=0;
  string sPass;
  string sString;


  


  DATAOUT.open("part_001.dat");
  DATAIN.open("GPL6947_family.soft");
  while(  getline(DATAIN,sString)  ){
    if(sString == "!Sample_series_id = GSE22070"){
      sPass=sString;
      break;
    }
    DATAOUT << sString <<endl;
  }
  DATAOUT.close();



  DATAOUT.open("part_002.dat");
  DATAOUT << sPass <<endl;
  while(  getline(DATAIN,sString)  ){
    DATAOUT << sString <<endl;
  }
  DATAOUT.close();
  DATAIN.close();





  return 0;
}

[Peter87]

That program has no memory leak

[bjfcom]

I agree with that logic. Ok, thanks for the reply. I suppose this has to do with my operating system then?

Thanks for the reply.

[Cubbi]

The overall "Used" field may not be the best indicator of per-process usage.

What does top show for your actual process under "RES" and "%MEM" columns?

[1yR4jE8b]

Since you're on Ubuntu, you can install "valgrind" to check your program for errors.

[kev82]

Not that there's anything wrong with what you're doing, but wouldn't a task like that be much quicker with shell?

Use grep -n to find the appropriate line number you want to split on, and then head and tail to get the separate parts.

[bjfcom]

thanks for all the replies.

@Cubbi: I'm running another program that will take a while to finish, but I will look into what the different fields mean, since, I believe, you are implying "Used" is not exactly used.

@darkestfright: I had read about that, but what I was doing was so simple, I just didn't understand how I was getting a "leak."

@kev82: OMG, how I love Linux. I know about all the commands you mentioned, but never thought about putting them together. My perl program blew up, so I thought I would use c++ to split the file. Thanks again kev82!

Thanks guys!

-Ben