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Multithreaded FTP upload. Is it possible?


Multithreaded FTP upload. Is it possible?

By : Alex Tremper
Date : November 20 2020, 07:00 PM
help you fix your problem There is an effor of creating an asynchronous FTP client but basically the FTP protocol allows synchronous commands. To allow parallel downloads/uploads you need to open multiple FTP connections. This can be done by ftplib and threads.
code :


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Does this multithreaded program perform better than the non-multithreaded one?

Does this multithreaded program perform better than the non-multithreaded one?


By : leo
Date : March 29 2020, 07:55 AM
To fix this issue This would depend on how many CPUs you have. With a single CPU core, a computation-bound program will never run faster with multiple threads.
Moreover, since you're doing all the work with the lock held, you'll end up with only a single thread running at any time, so it's effectively single threaded anyway.
Adding grpof -pg Options Makes My Multithreaded Application Non-multithreaded

Adding grpof -pg Options Makes My Multithreaded Application Non-multithreaded


By : AtomicSpaj
Date : March 29 2020, 07:55 AM
I wish this helpful for you I installed and tried OProfile, it works okay, and it can also give you the gprof-style results.
code :
opgprof ./bin/MyProgramBinary  # Generate the gmon.out file
gprof -p ./bin/MyProgramBinary > gmon.txt
Refactoring a multithreaded class into a single threaded + a multithreaded

Refactoring a multithreaded class into a single threaded + a multithreaded


By : Zachary Prybylo
Date : March 29 2020, 07:55 AM
like below fixes the issue You can use a decorator pattern or wrapper. .
A]A modified wrapper so that you get away with virtual functions:
code :
class MyClass{
protected:
  void _unsafeMethod(){};

};

class MyThreadSafeClass{
protected:
  somemutex mutex; 
  MyClass& myclassRef;
public:
    MyThreadSafeClass(MyClass& myclass):myclassRef(myclass){}
  void safeMethod(){
    locker lock(mutex);
    myclassRef._unsafeMethod();
  }
};
MyClass myclass;
MyThreadSafeClass mythreadsafeclass(myclass);
mythreadsafeclass.safeMethod();
class MyClassInterface{
public:
  virtual void Method()=0;

};

class MyClass : public MyClassInterface{
protected:
  virtual void Method() override{};

};

class MyThreadSafeClass: public MyClassInterface{
protected:
  somemutex mutex; 
  MyClassInterface& myclassRef;
public:
    MyThreadSafeClass(MyClassInterface& myclass):myclassRef(myclass){}
   virtual void Method() override{
     locker lock(mutex);
     myclassRef.Method();
  }
};
Importing DLL's doesn't work the same (VS2003 to VS2010, multithreaded to multithreaded DLL)

Importing DLL's doesn't work the same (VS2003 to VS2010, multithreaded to multithreaded DLL)


By : eintnohick
Date : March 29 2020, 07:55 AM
I wish this helpful for you I finally have some time to get back to answering this. Collin Dauphinee was correct in that it was a resource issue. I don't know why VS2003 is different from VS2010, but the solution was very simple.
code :
CConfigPlugin::CConfigPlugin(LPCTSTR szPluginName)
{
    ASSERT(szPluginName);
    ASSERT(AfxIsValidString(szPluginName));

    // Save off current Afx resource handle.
    HINSTANCE hCurrentAfx = AfxGetResourceHandle();  // <---  Didn't need to
                                                     // do this before.

    m_csFullpath = szPluginName;
    m_hModule = NULL;
    m_hModule = LoadLibrary(m_csFullpath);
    m_pInterface = (IConfigDllInterface *) NULL;
    pInterface pPtr = pInterface(NULL);

    if (m_hModule != NULL)
    {
        AfxSetResourceHandle(m_hModule);   // <--- here is where the resources
                                           // get properly set.  This is the
                                           // solution to the problem.

        //  If we loaded the DLL get the interface pointer
        pPtr = pInterface(GetProcAddress(m_hModule, "GetInterface"));
    }
    if (pPtr != NULL)
    {
        pPtr(&m_pInterface);
    }
    else
    {
        ::FreeLibrary(m_hModule);
        m_hModule = HMODULE(NULL);
    }

    // Now put Afx back.
    AfxSetResourceHandle(hCurrentAfx);
}
Single Threaded vs Multithreaded, Should I even be concerned with converting to Multithreaded?

Single Threaded vs Multithreaded, Should I even be concerned with converting to Multithreaded?


By : Muhammad Ilyas
Date : March 29 2020, 07:55 AM
I hope this helps . As long as you're using less than 100% of one core, there isn't much advantage to multithreading it.
OTOH, it's likely that not all of your users have a Mac that is as fast as yours. If your program ever gets run on a slower (yet still multicore) Mac, where the single-thread would pin a core at 100%, then multithreading would speed things up on that Mac.
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