Hi,

When upgrading our application from cURL version 1.25 to 1.31, many HTTP
requests take now longer - time increased from 40- 60ms to 151ms.

Our application does many HTTP requests per second to localhost using curl
easy interface. (TMS server)

I traced the problem back to curl_easy_perform(CURL *easy)in easy.c where

            Curl_wait_ms(sleep_ms);

gets called with sleep_ms == 150, i.e. without_fds == 3.

When I change the line that calculates sleep_ms (line 536):

                sleep_ms = without_fds * 50;

to:

                sleep_ms = without_fds * 5;

the HTTP requests return much faster again.

Is there a special reason for the 50ms wait?

Maybe this is some bug and 5-10ms wait would be better?

I also tried to find out why our application runs into the waiting
without_fds, but had no luck because it never happens when debugging because
then the timing is different. Can someone explain when curl_multi_wait()
cannot wait on a filedescriptor, so the Curl_wait_ms() gets called?

Thank you,

Andreas

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Received on 2013-07-12