PHP 允许的内存大小

问题描述

你好！

我有一个在付费 VPS 上运行的网络应用.那里没问题.我正在将此应用程序移至我自己的专用服务器.

I have a web-app running on a paid VPS. No problem there. I'm moving this app to my own dedicated server.

当前云服务器-CS-:Centos 6 x86_64；2 Gb 内存；2个虚拟CPU

Current Cloud Server -CS-: Centos 6 x86_64; 2 Gb Ram; 2 vCPU

专用服务器上的虚拟:Centos 7 x86_64；2 Gb 内存；2个虚拟CPU

Virtual on Dedicated Server: Centos 7 x86_64; 2 Gb Ram; 2 vCPU

我部署了具有相同规格的 PC，因为如果它可以正常工作，它应该也可以工作".

I deployed the PC with the same specs because "if it works okay with that it should work with the same".

在 API 的端点上，当前 CS 返回正确的 json.新服务器返回:

On a API's endpoint the current CS returns the correct json. The new Server returns:

致命错误:/var/www/api/Components/Database.php上线439

第 439 行是:

call_user_func_array(array($stmt, 'bind_result'), $parameters);

我在这里和那里找到的搜索结果都没有帮助.有人说升级 PHP 版本，其中 90% 设置了更大的内存限制.**我做到了**.我将它设置为 256M、512M、2GB(除此之外没有可用的内存)、4GB 和 5GB.** 纳达**

The search results I found here and there were not helpful. Some said upgrade PHP version and 90% of them is set a larger memory limit. ** I did**. I set it to 256M, 512M, 2GB (beyond this there is no ram available), 4GB and 5GB. ** Nada**

此查询在另一台生产服务器上运行正常.

This query works ok on the other -and production- server.

新服务器:

Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips mod_fcgid/2.3.9        

PHP/5.4.16 mod_wsgi/3.4 Python/2.7.5 
X-Powered-By: PHP/5.4.16

CS:

 Server: Apache 
 X-Powered-By: PHP/5.5.22

我查看正在查询的 base64 的 LENGTH.它们是发送的 2 张图像数据.这个大小由mysql返回:

I look at the LENGTH of the base64 being queried. They're 2 images data sent. This size is returned by mysql:

select LENGTH(image_base64) from pmv where pmv.model = 1;

这就是查询.它返回 2 行.Image_base64 是 LONGTEXT.还有其他一些列，但不会增加问题.

That is the query. It returns 2 row. Image_base64 is LONGTEXT. There are some others columns but it won't add to the issue.

LENGTH(image_base64)
162678
131402

显然不接近 4Gb

我无法在 CS 上访问 php/apache conf.我唯一没有尝试过的是将 PHP 从 5.4 升级到 5.5.可以吗?我会尝试在周末访问服务器以尝试任何其他想法.

I can't access php/apache conf on the CS. The only thing I didn't try yet is upgrading PHP from 5.4 to 5.5. Could be it? I'll try to get access to the server on weekend to try out any other ideas.

编辑#1

我将 PHP 版本更新为 5.6.9.

I update the PHP Version to 5.6.9.

同样的错误:

<b>Fatal error</b>:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 4294967296 bytes) in <b>/var/www/api/Components/Database.php</b> on line <b>439</b><br />

编辑#2

将列类型从 longtext 更改为 mediumtext 似乎在 这个问题

Changing the column type from longtext to mediumtext seems to work as in this question

但是为什么我需要更改此服务器上的列类型呢?据我现在可以测试，无论该列上存储了多少信息.只要它是一个longtext col，它就会给出错误.

But why on earth I need to change the column type on this server? As far I can test now, no matter how much info is stored on that column. It will give the error as long as it's a longtext col.

谢谢！

推荐答案

4294967296 字节听起来确实很多.你肯定在某个地方有内存泄漏.

4294967296 bytes sounds like really a lot. You surely have a memory leak somewhere.

你应该读一下 :

人，通过 ini_set('memory_limit', '-1'); 改变 memory_limit根本不是解决方案.

People, changing the memory_limit by ini_set('memory_limit', '-1'); is NOT a solution at all.

请不要那样做.显然 php 在某处有内存泄漏，你告诉服务器只使用它想要的所有内存.问题根本没有解决

Please don't do that. Obviously php has a memory leak somewhere and you are telling the server to just use all the memory that it wants. The problem has not been fixed at all

更新

如此错误报告中所述:

这是 ext/mysqli 在使用 libmysql(总是在 5.2 和更早版本中)以及使用 5.3 启用 libmysql 时的已知限制.原因是服务器发送的关于该列的元数据不太具体.此长文本的最大长度为 4G，ext/mysqli 尝试使用最大长度进行绑定，以确保不会发生数据丢失(数据不适合 C 级别的绑定缓冲区).

This is a known limitation of ext/mysqli when using libmysql (always in 5.2 and previous) and when libmysql is enabled with 5.3 . The reason is that the server sends not too specific metadata about the column. This longtext has a max length of 4G and ext/mysqli tries to bind with the max length, to be sure no data loss occurs (data doesn't fit in the bind buffer on C level).

所以要解决这个问题，你有 4 个解决方案:

So to fix that, you have 4 solutions :

• 您可以使用 text 或 mediumtext 代替 longblob 或 longtext 以使用更少的内存
• 您可以使用 PDO 连接器代替 mysqli，但我不知道在 SaskPhp 中实现它是否容易
• 你可以使用mysqli_stmt_store_result()来存储你本地数据，这也会增加您的内存使用量，但实际上更少，因为它与缓冲区大小共享.
• 您可以将 PHP 升级到高于 5.3 的版本.

• You can use a text or mediumtext instead of a longblob or longtext to use less memory
• You can use PDO connector instead of mysqli but I don't know if it's a easy thing to implement in SaskPhp
• You can use mysqli_stmt_store_result() to store you data locally, which will also increase your memory usage but really less since it's shared with the buffer size.
• You can upgrade your PHP with a version superior to 5.3.

就我个人而言，我会选择第四个，因为如果没有强制重构代码的重要部分，拥有最新版本通常会给您带来更多优势.

Personally, I would go for the fourth one since having an recent version generally bring you many more advantages if it doesn't oblige you to refactor significant parts of your code.

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