Hi everyone,

I've been searching a bit for known bugs, but I could not find anything
related to proxies and CPU.

After investigating the reasons for the high CPU load generated by an
application sending many curl requests with 20 parallel PHP-cli scripts,
I've found out the main reason is the PROXY option set to the cURL handle.

The following code is generating a 0.5-1.5% CPU load at the moment of
curl_exec when run without the proxy and 12-25% when using any proxy
(I've tried many different ones).

With many threads running many requests at the same time, it soon
becomes critical.
Any experience or suggestion about this? Should I open a curl bug?

I'm using:
Ubuntu 16.04
PHP 7.0.22
curl 7.55.1

Thanks,
Alessandro

$address = 'xxx';
$port = 'xxx';
$url = 'https://api.ipify.org?format=json';

do {
     $ch = curl_init();
     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
     curl_setopt($ch, CURLOPT_TIMEOUT, 10);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
     curl_setopt($ch, CURLOPT_HEADER, false);
     curl_setopt($ch, CURLOPT_ENCODING, 'identity');
     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
     curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
     curl_setopt($ch, CURLOPT_PROXY, $address);
     curl_setopt($ch, CURLOPT_PROXYPORT, $port);
     curl_setopt($ch, CURLOPT_URL, $url);
     curl_exec($ch);
     curl_close($ch);
     sleep(10);

} while (true);
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Received on 2017-10-30