[Boost-users] boost::interprocess, shared memory and multi-core

Shared memory or other constructs from boost::interprocess will be used on multi-core computers? Will it be a performance degradation if two processes are allocated to different cores versus one core? The same with threads? Another look at this question is - should one program the inter-process/inter- thread communication first and worry about multi-core later? Or something should be planned at the development stage?