After some simple tests, I found that it takes several more times to execute
the function when there is only one active task.
To be concrete, the function ran 6 times per second when there was only one
active task, and the number went up to 200 times per second when there are 3
tasks.
------------------ Original ------------------
From: "Yehezkel Horowitz";<[email protected]>;
Date: Thu, Dec 5, 2013 07:24 PM
To: "libcurl development"<[email protected]>;
Subject: RE: Re:RE: slow uploading speed for single task on osx
> timeval timeout = {0, IO_IDLE_WAIT_INTERVAL *
> 1000};
> select(max_fd, &read_fdset, &write_fdset,
> &exc_fdset, &timeout);
What is the value of IO_IDLE_WAIT_INTERVAL?
According to curl documentation, you should use curl_multi_timeout to figure
out the needed timeout for the select call.
Please read http://curl.haxx.se/libcurl/c/curl_multi_fdset.html
BTW, consider use curl_multi_socket_action API instead of curl_multi_perform.
------------------ Original ------------------
From: "Yehezkel Horowitz";<[email protected]>;
Date: Thu, Dec 5, 2013 06:22 PM
To: "libcurl development"<[email protected]>;
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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