Hi All, This is regarding performance issue due to usage of async DNS resolver for MULTI interface in lib CURL.
My application is using lib CURL (7.57 version) Muti interface with async DNS resolver enabled (I.e CURLRES_ASYNCH and POSIX_THREADED are defined). But I am facing performance issues as there is no mechanism in CURL to notify DNS resolved status back to client application due to which HTTP request (after DNS resolution) are going out of the box with delay. The reason for the delay is that application is having a timer implementation which wakes up every 1 second (GetAddrInfo() is used for DNS resolution so there is no sock fd to poll) and requests CURL to check all the ongoing requests (I.e. by calling curl_multi_perform()). So even if DNS was resolved within 100 msec, request will only be sent out after 1 second (I.e. with the delay of 900 msec). I could see that in CURL release (7.59) a callback has been added to notify the clients about DNS resolution start status, but this will not help as I am looking for some trigger to notify about DNS resolution. I would like to seek your opinion/thoughts if it is good idea to re-use the existing callback to notify the client about DNS resolution ?. Thanks & Regards, Amit Katyal
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