cache issue

i am using cachemanager cache in public site under catalog controller , but the cache gets removed when i visit next  controller like product controller   or other controller , here when i visit product controller , this controller specific cache alone gets set i cachemanager cache whereas my cache i did in catalog controller gets lost. How to maintain / persist cachemanger cache throughout the application

Check whether your controller uses nop_cache_static or nop_cache_per_request.

nop_cache_static = Shared with all users over many requests
nop_cache_per_request = Only for the current request

For me it seems like you are using nop_cache_per_request.