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What triggers caching iOS 5.0?

Starting with iOS 5.0, Apple began to clean or clean the Caches directory inside individual applications when it decided that the device was using too much space. Can someone point me to the place of documentation or anecdotal information about at what threshold the cache is cleared (for example, 90% + disk usage) and how often is it checked?

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From my testing, it seems that erasing occurs with all applications that are not currently working, when the use of space on the device EXCEEDS the number of messages (as if the iPhone is in the space available to prevent it from falling into the reserved space), When you cross this line, appears dialogue:

iPhone too much space Dialogue

And when you press this, he then wipes the space. This is the only situation where I was able to play reliably in order to start cleaning (for testing / etc), and I did this by filling my device as much as I could with movies and music, and then uploaded large files to DropBox.

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, , , , , . . , Apple , iOS 5.0.1 " ":

http://developer.apple.com/library/ios/#qa/qa1719/_index.html

Documents/dir Library/Private Documents/ " ".

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