Hello.

I found that CURLMOPT_TIMERFUNCTION callback is often called with 0 value.
This happens when resolver thread is working.
What for?

Because of this the main thread makes a lot of empty calls:
1) timer_callback
2) select (epoll) with 0 second
3) curl_multi_socket_action with CURL_SOCKET_TIMEOUT
and again timer_callback many times

CPU is used on 100% if resolver do not found info in cache.

I found what https://curl.haxx.se/libcurl/c/hiperfifo.html worked similarly.
300 system calls (kevent, epoll) are for one url.
And 52 system calls before as file /etc/resolv.conf is opened.

How do I solve this problem?

Nick.
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Received on 2019-03-26