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Bug #61240 curl_multi_select cause cpu load 100%
Submitted: 2012-03-02 08:51 UTC Modified: 2012-09-22 13:29 UTC
Votes:3
Avg. Score:5.0 ± 0.0
Reproduced:3 of 3 (100.0%)
Same Version:2 (66.7%)
Same OS:3 (100.0%)
From: niniwzw at qq dot com Assigned: pierrick (profile)
Status: Not a bug Package: cURL related
PHP Version: 5.3.10 OS: window xp
Private report: No CVE-ID: None
View Developer Edit
 [2012-03-02 08:51 UTC] niniwzw at qq dot com 
Description:
------------
---
From manual page: http://www.php.net/function.curl-multi-exec
---
In the document of curl_multi_exec, has a example in the document.
it can run in php 5.2, but php 5.3 and php 5.4 cause cpu load 100%.

the example is:
<?php
// create both cURL resources
$ch1 = curl_init();
$ch2 = curl_init();

// set URL and other appropriate options
curl_setopt($ch1, CURLOPT_URL, "http://lxr.php.net/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
curl_setopt($ch2, CURLOPT_HEADER, 0);

//create the multiple cURL handle
$mh = curl_multi_init();

//add the two handles
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);

$active = null;
//execute the handles
do {
    $mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}

//close the handles
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);

?>

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 [2012-04-03 16:27 UTC] bompus at gmail dot com 
Related to 60790 and 61141
 [2012-04-05 02:01 UTC] niniwzw at qq dot com 
the best solution work without the curl_multi_select may be this:
<?php
// create both cURL resources
$ch1 = curl_init();
$ch2 = curl_init();

// set URL and other appropriate options
curl_setopt($ch1, CURLOPT_URL, "http://lxr.php.net/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
curl_setopt($ch2, CURLOPT_HEADER, 0);

//create the multiple cURL handle
$mh = curl_multi_init();

//add the two handles
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);

$active = null;
$exec_count = 0;
do {
	$mrc = curl_multi_exec($mh, $active);
	usleep(1);
	$exec_count++;
} while ($mrc == CURLM_CALL_MULTI_PERFORM || ($active && $mrc == CURLM_OK));

//close the handles
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);

var_dump($exec_count);
?>
I scan the source code of curl_multi_select, there was no change from php 5.2.17 to 5.3.10, may be it's the problem of libcurl(curl_multi_fdset, fuction)
 [2012-09-22 13:29 UTC] pierrick@php.net
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: pierrick
 [2012-09-22 13:29 UTC] pierrick@php.net 
This is not a bug. This behaviour is due to the same reason as bug #61141 (cf my 
comment on this bug).
 
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