How do you limit the cache in OSX 10.9

I have a macbook air which of course has fixed memory which cannot be upgraded, however I have the problem which many people appear to have in that the file cache is eating up the memory completely this is preventing applications from starting. As there is no opportunity to upgrade the memory or revert the operating system the machine is more or less useless if I cannot reduce the cache. The cashe is not being releases in favour of applications and during the boot process it is using all the available memory. Thus preventing further applications from being started
Having worked in the IT industry for many years and used Apple over 10 years I have never had the situation that an operating system upgrade has made a machine worthless. At the boot the cache is using up all the spare memory
So the question is simple what are the configuration options to set the file cache memory to prevent it using everything.

the file cache is eating up the memory completely this is preventing applications from starting.
What makes you think this is happening?

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