我认为STL导致我的应用程序三倍内存使用

Question

我正在我的应用程序中输入一个200mb的文件,由于一个非常奇怪的原因,我的应用程序的内存使用量超过600mb.我尝试过vector和deque,以及std :: string和char*但没有用.我需要我的应用程序的内存使用与我正在阅读的文件几乎相同,任何建议都将非常有用.是否有导致如此多内存消耗的错误？你能指出问题还是重写整个问题？

Windows Vista SP1 x64,Microsoft Visual Studio 2008 SP1,32位版本,Intel CPU

整个申请到现在为止:

#include <string>
#include <vector>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <iterator>
#include <algorithm>
#include <time.h>



static unsigned int getFileSize (const char *filename)
{
    std::ifstream fs;
    fs.open (filename, std::ios::binary);
    fs.seekg(0, std::ios::beg);
    const std::ios::pos_type start_pos = fs.tellg();
    fs.seekg(0, std::ios::end);
    const std::ios::pos_type end_pos = fs.tellg();
    const unsigned int ret_filesize (static_cast<unsigned int>(end_pos - start_pos));
    fs.close();
    return ret_filesize;
}
void str2Vec (std::string &str, std::vector<std::string> &vec)
{
    int newlineLastIndex(0);
    for (int loopVar01 = str.size(); loopVar01 > 0; loopVar01--)
    {
        if (str[loopVar01]=='\n')
        {
            newlineLastIndex = loopVar01;
            break;
        }
    }
    int remainder(str.size()-newlineLastIndex);

    std::vector<int> indexVec;
    indexVec.push_back(0);
    for (unsigned int lpVar02 = 0; lpVar02 < (str.size()-remainder); lpVar02++)
    {
        if (str[lpVar02] == '\n')
        {
            indexVec.push_back(lpVar02);
        }
    }
    int memSize(0);
    for (int lpVar03 = 0; lpVar03 < (indexVec.size()-1); lpVar03++)
    {
        memSize = indexVec[(lpVar03+1)] - indexVec[lpVar03];
        std::string tempStr (memSize,'0');
        memcpy(&tempStr[0],&str[indexVec[lpVar03]],memSize);
        vec.push_back(tempStr);
    }
}
void readFile(const std::string &fileName, std::vector<std::string> &vec)
{
    static unsigned int fileSize = getFileSize(fileName.c_str());
    static std::ifstream fileStream;
    fileStream.open (fileName.c_str(),std::ios::binary);
    fileStream.clear();
    fileStream.seekg (0, std::ios::beg);
    const int chunks(1000); 
    int singleChunk(fileSize/chunks);
    int remainder = fileSize - (singleChunk * chunks);
    std::string fileStr (singleChunk, '0');
    int fileIndex(0);
    for (int lpVar01 = 0; lpVar01 < chunks; lpVar01++)
    {
        fileStream.read(&fileStr[0], singleChunk);
        str2Vec(fileStr, vec);
    }
    std::string remainderStr(remainder, '0');
    fileStream.read(&remainderStr[0], remainder);
    str2Vec(fileStr, vec);      
}
int main (int argc, char *argv[])
{   
        std::vector<std::string> vec;
        std::string inFile(argv[1]);
        readFile(inFile, vec);
}

Answer 1

你的记忆力正在分散.

尝试这样的事情:

  HANDLE heaps[1025];
  DWORD nheaps = GetProcessHeaps((sizeof(heaps) / sizeof(HANDLE)) - 1, heaps);

  for (DWORD i = 0; i < nheaps; ++i) 
  {
    ULONG  HeapFragValue = 2;
    HeapSetInformation(heaps[i],
                       HeapCompatibilityInformation,
                       &HeapFragValue,
                       sizeof(HeapFragValue));
  }