Memory Management

get_active_memory()	Get the actively used memory in bytes.
get_peak_memory()	Get the peak amount of used memory in bytes.
reset_peak_memory()	Reset the peak memory to zero.
get_cache_memory()	Get the cache size in bytes.
set_memory_limit(limit)	Set the memory limit.
set_cache_limit(limit)	Set the free cache limit.
set_wired_limit(limit)	Set the wired size limit.
clear_cache()	Clear the memory cache.