PHP Imagick内存泄漏 [英] PHP Imagick memory leak

问题描述

我必须在PHP CLI上使用Imagick渲染某些内容. 我注意到服务器内存每隔3-5天就会用完，所以我什至无法通过ssh或ftp连接.

I have to render something with Imagick on PHP CLI. I have noticed that every 3-5 days the server memory gets full, so i can't even connet via ssh or ftp.

使用memory_get_usage()将内存泄漏归结为脚本的imagick部分. 脚本看起来像这样:

with memory_get_usage() i narrwoed the memory leak down to the imagick part of the script. the script looks something like this:

$sourceImg = 'source.png';
$destImg = 'dest.png';
$background ='#00ff00';

$im = new Imagick();
$im->pingImage($sourceImg);
$im->readImage($sourceImg); 
$draw = new ImagickDraw();

for($i=1;$i<=5;$i++){
    $draw->setFillColor( $background);
    $draw->rectangle( 10*$i+5, 10, 10*$i+10, 20);
} 

$im->drawImage( $draw );
$im->writeImage( $destImg );
$im->destroy();

unset($im,$draw);

我销毁图像参考，并取消设置imagick和imagickDraw对象，但是脚本不会释放任何内存. setFillColor()方法占用最多的内存

I destroy the image reference, and unset the imagick and imagickDraw object, but the script won't release any memory. The setFillColor() method takes the most memory

我还能做些其他事情来释放imageick占用的空间吗?

Can i do something else to free the space used by imageick?

内存消耗的图像

推荐答案

imagick使用共享库，并且它的内存使用情况对于PHP来说是遥不可及的，因此调整PHP内存和垃圾回收将无济于事.

imagick uses a shared library and it's memory usage is out of reach for PHP, so tuning PHP memory and garbage collection won't help.

我自己也遇到了同样的问题，试图处理50页(！)3000x2000像素的多页tiff图像. 解决方案是让imagick将其像素缓存放在磁盘上.

I had the same problem myself, trying to handle a multi-page-tiff image with 50 (!) pages of 3000x2000 pixels. The solution is to have imagick put its pixel cache on disk.

在创建Imagick对象之前添加此内容对我来说解决了这个问题:

Adding this prior to creating the Imagick object solved the problem for me:

// pixel cache max size
IMagick::setResourceLimit(imagick::RESOURCETYPE_MEMORY, 256);
// maximum amount of memory map to allocate for the pixel cache
IMagick::setResourceLimit(imagick::RESOURCETYPE_MAP, 256);

目标是使imagick将其像素缓存放置在磁盘上，而不是在RAM中.默认位置似乎是文件/tmp/magick-XXnnnnn，因此请确保/tmp不在shmfs/ramdisk上，或者更改imagick使用的临时目录.

The goal is to make imagick put its pixel cache on disk instead of in RAM. The default place seems to be files /tmp/magick-XXnnnnn, so make sure /tmp is not on shmfs/ramdisk, or change the temp directory imagick uses.

要研究的其他资源限制:imagick::RESOURCETYPE_DISK，imagick::RESOURCETYPE_FILE和imagick::RESOURCETYPE_AREA. 它们在 imagick :: getResourceLimit()手册页中进行了描述(在页面中效果不太理想)表示setResourceLimit()).

Other resouce limits to investigate: imagick::RESOURCETYPE_DISK, imagick::RESOURCETYPE_FILE, and imagick::RESOURCETYPE_AREA. They are described in the imagick::getResourceLimit() manual page (not so well in the page for setResourceLimit()).

在我的图像处理循环中，我有set_time_limit(300)，因为脚本需要花费很多时间来处理这张巨大的图像(当解压缩时).

In my image handling loop, I have set_time_limit(300), since the script takes ages to process this huge (when uncompress) image.

---

在最新版本中，不应将setResourceLimit()作为静态方法调用，而应在实际对象上调用，例如:

---

EDIT : In recent versions, setResourceLimit() should not be called as a static method, but on the actual object instead, such as:

$im->setResourceLimit(imagick::RESOURCETYPE_MEMORY, 256);
$im->setResourceLimit(imagick::RESOURCETYPE_MAP, 256);
$im->setResourceLimit(imagick::RESOURCETYPE_AREA, 1512);
$im->setResourceLimit(imagick::RESOURCETYPE_FILE, 768);
$im->setResourceLimit(imagick::RESOURCETYPE_DISK, -1);

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