./xpt5.pl
             total       used       free     shared    buffers     cached
Mem:          3948        763       3185          0         42        146
-/+ buffers/cache:        574       3374
Swap:         2392         36       2355
#Before array setup - using system("date");: Fri Feb 19 09:15:33 GMT 2010

$?=0x0 $!=
#Finished setup of two arrays 5761 x 2881
#Going to sleep for 15 seconds - go and run free -m
#Awake again
#After array setup - using system("date");:
$?=0x0 $!=Cannot allocate memory

#End