Problem with cache memory

Hello,

I have a problem with overfilling cache memory, using long newman runs. I run collection which adds some data to my database in live mode. It shouldnt stop but when its working about 2 hours, cache memory is filled and my computer stops working properly.

My computer has 8 GB RAM but its not enough.
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Durning run, free cache memory is dropping. Old data (which is useless for me) is kept and released too slow which cause overfilling cache memory.

Moreover, I have “send no-cache header” option on but this dont do anything for me.

Have can I cope with this?
Thanks for any kind of help.