I think this has something to do with deployment from cruise control. I only get the very high (on the order of gigs) memory error when someone is deploying new code (or just after new code has been deployed). This makes a little bit of sense too since the error always points to a line that is a "require_once." Each time I get an error: Fatal error: Out of memory (allocated 4456448) (tried to allocate 3949907977 bytes) in /directory/file.php on line 2

I have replaced the "require_once" line with: class_exists( Ingrain_Security_Auth ) || require( Ingrain/Security/Auth.php );

到目前为止，我已经替换了3个文件中的那一行，并且没有出现任何内存问题。有人能够说明一下可能发生了什么吗？我正在使用Cruise Control进行部署。

一般来说，对于 PHP 5.2 和/或 PHP 5.3，我倾向于认为 memory_limit 大于 32M 是“太多了”：

• Using Frameworks / ORM and stuff like this, 16M is often not enough
• Using 32M is generally enough for the kind of web-applications I m working on (typical websites)
• Using more than 64M means the server will not be able to handle as many users as we d like.

When, it comes to a script reaching memory_limit, the usual problem is trying to load too much data into memory ; a couple of examples :

• Loading a big file in memory, with functions such as file or file_get_contents, or XML-related functions/classes
• Creating a too big array of data
• Creating too many objects

考虑到您使用了ORM，您可能会处于以下情况下：

• You are doing some SQL query that returns a lot of rows
• Your ORM is converting each row in objects, putting those in an array
• In which case a solution would be to load less data
  • using pagination, for instance
  • or trying to load data as arrays instead of objects (I don t know if this is possible with Propel -- but it is with Doctrine ; so maybe Propel has some way of doing that too ? )

您的应用程序在耗尽内存时到底在做什么？可能有很多原因造成这种情况。我可以说最常见的原因就是将太多的数据分配给一个数组。您的应用程序有没有这方面的情况呢？

你有两件事情中的一件发生了，也许两件都发生了：

1. You have a runaway process somewhere that isn t ending when it should be.
2. You have algorithms that throw lots of data around, such as huge strings or arrays or objects, and are making needless copies instead of processing just what they need and discarding what they don t.