thank you for your reply.

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** [bugs:#1320] noneed call for print_pipeline function**
**Status:** closed-fixed
**Created:** Fri Jan 03, 2014 10:59 AM UTC by he qin
**Last Updated:** Fri Jan 03, 2014 11:05 AM UTC
**Owner:** Daniel Stenberg
void print_pipeline(struct connectdata *conn)  function will be called every time when Curl_add_handle_to_pipeline called. 
there is no need for the call. when conn_list is large, cpu will be 100% and the hot point of cpu is the calling of  print_pipeline.
this function do nothing just print some debug info . I think there is no need to call this function. 
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