The core code that I deal with the multi-curl. Hope that it helps.



 
void CurlMultiRunner::perform()
 
{
 
        // wait for more events
 
        fd_set read_fdset, write_fdset, exc_fdset;
 
        int max_fd;
 


 
        FD_ZERO(&read_fdset);
 
        FD_ZERO(&write_fdset);
 
        FD_ZERO(&exc_fdset);
 
        curl_multi_fdset(scopped_curlm_.get(), &read_fdset, &write_fdset, &exc_fdset, &max_fd);
 


 
        if(max_fd == -1)
 
        {
 
#ifdef _EMACLE_WIN_
 
                ::Sleep(IO_IDLE_WAIT_INTERVAL);
 
#elif defined(_EMACLE_OSX_)
 
        usleep(IO_IDLE_WAIT_INTERVAL*1000);
 
#endif
 
        }
 
        else
 
        {
 
                timeval timeout = {0, IO_IDLE_WAIT_INTERVAL * 1000};
 
                select(max_fd, &read_fdset, &write_fdset, &exc_fdset, &timeout);
 
        }
 


 
        // perform the transfer
 
        int running_handles = 0;
 
        for (CURLMcode cm_code = CURLM_CALL_MULTI_PERFORM;
 
                cm_code == CURLM_CALL_MULTI_PERFORM;)
 
        {
 
                cm_code = curl_multi_perform(scopped_curlm_.get(), &running_handles);
 
                checkPerformingResult(static_cast<size_t>(running_handles));
 
        }
 
}



------------------ Original ------------------
From: "Yehezkel Horowitz";<horowity_at_checkpoint.com>;
Date: Thu, Dec 5, 2013 06:22 PM
To: "libcurl development"<curl-library_at_cool.haxx.se>;

Subject: RE: slow uploading speed for single task on osx



>> The lib curl version is 7.26. And because the code concerning about
>> lib curl is deeply embedded into the solution, it might be a little
>> bit hard to extract the complete sample code to repeat the problem :(

>The multi interface has nothing in itself that makes it slower than the easy interface (unless you've found a bug). I would say that it is likely something in your use of it that makes it slow.

Maybe when there are more than one transfer, the application call curl_multi_perform or curl_multi_socket_action more frequently.
This is indeed wrong usage, as the calls should be done according to events (socket/timeout).

Please give us more details when you call curl_multi_perform/curl_multi_socket_action from your code (what is the trigger to those calls), and when you call it with CURL_SOCKET_TIMEOUT...

Regards,

Yehezkel Horowitz

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Received on 2013-12-05