[Dancer-users] activate cache based on memory usage

Dear Dancers, i would like to activate my caching mechanism if perl uses more than a certain amount of memory. Two questions 1) is this the right approach or should I look for some other criterion to active cache? 2) How to do it? I looked at - http://perldoc.perl.org/perldebguts.html#Debugging-Perl-memory-usage and - Memory::Usage, but this seems not to work from under Dancer. Thanks! Maurice