c'mon people: /usr/bin/purge
Just type in 'purge' at the command line (Terminal.app)
from the man page:
PURGE BSD System Manager's Manual PURGE
purge -- force disk cache to be purged (flushed and emptied)
Purge can be used to approximate initial boot conditions with a cold disk buffer cache for performance analysis.
It does not affect anonymous memory that has been allocated through malloc, vm_allocate, etc.
Alternately, run 'du /' in the terminal for 10 seconds and then kill it with 'killall du'
Rapidly seeking the hard disk tends to free up inactive memory.
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