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Repeated calls to ares_init when using c-ares

From: Jeff Mears via curl-library <curl-library_at_cool.haxx.se>
Date: Tue, 28 Jan 2020 20:54:38 +0000

When using c-ares for async DNS, every time curl_easy_init is called, libcurl calls ares_init via Curl_resolver_init. In an environment with many requests being done using the "multi" interface, this is slow.

ares_init does things like read /etc/resolv.conf and initializing big arrays. It's enough that ares_init is showing up in CPU usage profiles.

Is there a way for libcurl to use one instance of c-ares, rather than trying to create one for every curl_easy_init?

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Received on 2020-01-28