Rails没有将ActionController的实例池化；相反，它为每个请求创建新的实例。
Rails doesn't pool the instance of the ActionController; instead, it creates a new instance for each request.
连接池可提高性能，因为一将数据源对象实例化，它就会创建一个连接。
Connection pooling improves performance as a data source object creates a connection as soon as it is instantiate.
根据实例的大小，捕获它最多可能需要30分钟时间，然后，将实例从一个池复制到另一个池并对其实例化可能需要同样的时间。
Depending on the size of the instance it can take up to 30 minutes to capture it, and then a similar amount of time to copy it from one pool to another and re-instantiate it.
在测试中实例化数据池对象。
在测试中实例化数据池对象。
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