Subtracting shared from resident gives a best case, I think, because the "shared" memory isn't necessarily shared. The thing that drives me nuts is the people

Subtracting shared from resident gives a best case, I think, because the "shared" memory isn't necessarily shared. The thing that drives me nuts is the people who freak out over Apache's memory usage because they add up the resident size of each worker. Then they go to the trouble of getting FCGI working with nginx or lighttp, all to save, at best a dozen MB or so, and at worst, to use more memory, because they start the fcgi workers in such a way that they don't share memory for things like the PHP opcode cache. Then they evangelize their ignorance.