Question

以下代码从磁盘读取一个大对象集合（95G压缩对象，通过WriteObject流处理器解压缩），并将其内容打印为字符串。

object.cxx：

std::vector<char> ObjectHandler::GetObject(const std::string& path)
{
  TFile *file = new TFile(path.c_str());

  // If file was not found or empty
  if (file->IsZombie()) {
    cout << "The object was not found at " << path << endl;
  }

  // Get the AliCDBEntry from the root file
  AliCDBEntry *entry = (AliCDBEntry*)file->Get("AliCDBEntry");

  // Create an outcoming buffer
  TBufferFile *buffer = new TBufferFile(TBuffer::kWrite);

  // Stream and serialize the AliCDBEntry object to the buffer
  buffer->WriteObject((const TObject*)entry);

  // Obtain a pointer to the buffer
  char *pointer = buffer->Buffer();

  // Store the object to the referenced vector
  std::vector<char> vector(pointer, pointer + buffer->Length());

  // Release the open file
  delete file;

  delete buffer;

  return vector;
}

main.cxx：

ObjectHandler objHandler;
boost::filesystem::path dataPath("/tmp");
boost::filesystem::recursive_directory_iterator endIterator;

if (boost::filesystem::exists(dataPath) && boost::filesystem::is_directory(dataPath)) {
  for (static boost::filesystem::recursive_directory_iterator directoryIterator(dataPath); directoryIterator != endIterator;
     ++directoryIterator) {
    if (boost::filesystem::is_regular_file(directoryIterator->status())) {

      cout << directoryIterator->path().string() << endl;
      std::vector<char> vector = objHandler.GetObject(directoryIterator->path().string());
      cout << vector << endl;
      }
   }
}

1）按值调用是否正确实现此方法？我是否正在做其他副本，如果通过引用进行调用可以避免？

2）此代码泄漏，我怀疑 char *指针是否应该归咎于返回的 std :: vector em> ObjectHandler :: GetObject（）方法。我已使用以下代码测试了实现：

struct sysinfo sys_info;

sysinfo (&sys_info);

cout << "Total: " << sys_info.totalram *(unsigned long long)sys_info.mem_unit / 1024 << " Free: " << sys_info.freeram *(unsigned long long)sys_info.mem_unit/ 1024 << endl;

并且自由ram不断减少，直到它达到0并且程序被杀死。

Answer 1

＆＃34;内存泄漏＆＃34;是一个可以涵盖一些事物的术语;取决于你与谁交谈。一个是没有匹配删除的新内容。另一个经常被查看过的内存是仍在引用和范围内的内存，但只是没有使用或需要。

如果你不使用profiller，那么你无法确定你有哪些，但是因为你传递了一个大型载体，我们不知道是什么你做到了，你可能会做第二次，没有人会看到。

c ++ char * + std :: vector memory leak

1 个答案: