As I said I was trying to get closer to your case.
# get some pictures
$ apt-get install ubuntu-wallpapers-zesty ubuntu-wallpapers-karmic
ubuntu-wallpapers-lucid ubuntu-wallpapers-maverick ubuntu-wallpapers-natty
ubuntu-wallpapers-oneiric ubuntu-wallpapers-precise ubuntu-wallpapers-quantal
ubuntu-wallpapers-raring ubuntu-wallpapers-saucy ubuntu-wallpapers-trusty
ubuntu-wallpapers-utopic ubuntu-wallpapers-vivid ubuntu-wallpapers-wily
$ mkdir /var/www/html/thumbs
$ chgrp www-data /var/www/html/thumbs
$ chmod g+w /var/www/html/thumbs
To process those in my case needed ~16 seconds.
So I duplicated the pictures 3 times
$ cd /usr/share/backgrounds
$ for i in *; do cp $i dup_1_$i; cp $i dup_2_$i; cp $i dup_3_$i; done
The code now is:
<?php
header("Content-Type: text/plain");
ini_set('max_execution_time', 30);
$photos = [];
if ($album_root = opendir("/usr/share/backgrounds")) {
while (false !== ($entry = readdir($album_root))) {
if (preg_match('/\.(jpe?g|gif|png)$/i', $entry)) {
$photos[] = $entry;
}
}
closedir($album_root);
sort($photos);
foreach($photos as $photo) {
echo "Processing " . $photo . " at " . date('h:i:s') . "\n";
$thumb = 'thumbs/'.$photo;
if (!file_exists($thumb)) {
$image = new \Imagick(realpath('/usr/share/backgrounds/'.$photo));
$image->thumbnailImage(64, 48, true, false);
$image->writeImage($thumb);
$image->clear;
$image = null;
}
}
}
echo "Leaking " . memory_get_usage() . "\n";
#busy wait until killed, and consume execution time (so no sleep)
$st_tm = time();
$diff=0;
while (1){
if ((time() - $st_tm) > $diff) {
$diff=(time() - $st_tm);
echo "Waiting to Die " . date('h:i:s') . "\n";
flush();
}
}
?>
With that it exceeds the 30 seconds just as it does in your case (needs ~40).
While running I see it changing memroy consumption between 80 and 120 MB.
But never exceeding as if some garbagde collection works as expected.
Many concurrent requests got my system stuttering via cpu consumption but
nothing exceeded any memory limit.
So killed by max_execution_time while doing the same workload you have it never
exceeded the 128M I had set.
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https://bugs.launchpad.net/bugs/1677578
Title:
php-fcgi: max_execution_time causes memory leaks
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