Testing 95 regular curl_exec requests vs curl_multi_exec requests

curl-multi-test.php

<?php

$sites = [
	'http://www.google.com/',
	'http://www.facebook.com/',
	'http://www.youtube.com/',
	'http://www.yahoo.com/',
	'http://www.live.com/',
	'http://www.wikipedia.org/',
	'http://www.baidu.com/',
	'http://www.blogger.com/',
	'http://www.msn.com/',
	'http://www.qq.com/',
	'http://www.twitter.com/',
	'http://www.yahoo.co.jp/',
	'http://www.google.co.in/',
	'http://www.taobao.com/',
	'http://www.google.de/',
	'http://www.google.com.hk/',
	'http://www.wordpress.com/',
	'http://www.sina.com.cn/',
	'http://www.amazon.com/',
	'http://www.google.co.uk/',
	'http://www.microsoft.com/',
	'http://www.myspace.com/',
	'http://www.google.fr/',
	'http://www.bing.com/',
	'http://www.ebay.com/',
	'http://www.yandex.ru/',
	'http://www.google.co.jp/',
	'http://www.linkedin.com/',
	'http://www.google.com.br/',
	'http://www.163.com/',
	'http://www.mail.ru/',
	'http://www.flickr.com/',
	'http://www.craigslist.org/',
	'http://www.fc2.com/',
	'http://www.google.it/',
	'http://www.rapidshare.com/',
	'http://www.conduit.com/',
	'http://www.vkontakte.ru/',
	'http://www.google.es/',
	'http://www.soso.com/',
	'http://www.bbc.co.uk/',
	'http://www.imdb.com/',
	'http://www.doubleclick.com/',
	'http://www.livejasmin.com/',
	'http://www.go.com/',
	'http://www.aol.com/',
	'http://www.youku.com/',
	'http://www.google.com.mx/',
	'http://www.apple.com/',
	'http://www.googleusercontent.com/',
	'http://www.sohu.com/',
	'http://www.orkut.com.br/',
	'http://www.pornhub.com/',
	'http://www.xvideos.com/',
	'http://www.google.ca/',
	'http://www.cnn.com/',
	'http://www.ask.com/',
	'http://www.photobucket.com/',
	'http://www.google.ru/',
	'http://www.adobe.com/',
	'http://www.youporn.com/',
	'http://www.orkut.com/',
	'http://www.about.com/',
	'http://www.mediafire.com/',
	'http://www.espn.go.com/',
	'http://www.tudou.com/',
	'http://www.ebay.de/',
	'http://www.rakuten.co.jp/',
	'http://www.files.wordpress.com/',
	'http://www.4shared.com/',
	'http://www.google.co.id/',
	'http://www.xhamster.com/',
	'http://www.google.cn/',
	'http://www.cnet.com/',
	'http://www.ameblo.jp/',
	'http://www.google.com.tr/',
	'http://www.paypal.com/',
	'http://www.imageshack.us/',
	'http://www.google.com.au/',
	'http://www.hotfile.com/',
	'http://www.livejournal.com/',
	'http://www.hi5.com/',
	'http://www.uol.com.br/',
	'http://www.orkut.co.in/',
	'http://www.sogou.com/',
	'http://www.cpxinteractive.com/',
	'http://www.nytimes.com/',
	'http://www.livedoor.com/',
	'http://www.hao123.com/',
	'http://www.google.pl/',
	'http://www.mixi.jp/',
	'http://www.godaddy.com/',
	'http://www.tube8.com/',
	'http://www.tianya.cn/',
	'http://www.kaixin001.com/',
];

$timeStart = microtime(true);
foreach ($sites as $site) {
	try {
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_URL, $site);
		curl_setopt($curl, CURLOPT_TIMEOUT, 20);
		curl_setopt($curl, CURLOPT_HEADER, 1);
		curl_setopt($curl, CURLOPT_NOBODY, 1);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
		curl_exec($curl);
		curl_close($curl);
	} catch (Exception $e) {
		echo $e->getMessage();
	}
}
echo 'cURL: Total execution time in seconds: ' . (microtime(true) - $timeStart) . "\n";


$timeStart = microtime(true);
$mh        = curl_multi_init();
$handles   = [];
$errors    = [];

foreach ($sites as $site) {
	try {
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_URL, $site);
		curl_setopt($curl, CURLOPT_TIMEOUT, 20);
		curl_setopt($curl, CURLOPT_HEADER, 1);
		curl_setopt($curl, CURLOPT_NOBODY, 1);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

		curl_multi_add_handle($mh, $curl);
		$handles[] = $curl;
	} catch (Exception $e) {
		echo $e->getMessage();
	}
}

$running = null;
do {
	curl_multi_exec($mh, $running);
	usleep(100000);
} while ($running > 0);

for ($i = 0; $i < count($handles); $i++) {
	curl_multi_remove_handle($mh, $handles[$i]);
}

curl_multi_close($mh);

echo 'cURL Multi: Total execution time in seconds: ' . (microtime(true) - $timeStart) . "\n";

Results:

cURL: Total execution time in seconds: 63.931462049484
cURL Multi: Total execution time in seconds: 10.752547979355