use re 'debug'; and see if it sheds any light, this replicates your results 

perl -Mre=debug -e"$f = q~a b c~ x 1;$g = [split m{\p{IsSpace}}ms, $f 
+];" 


perl -e"die 1E7"

perl -Mre=debug -e"$f = q~a b c~ x 1E7;$g = [split m{\p{IsSpace}}ms, $
+f ];" 2>2

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In reply to Re: Tokenising a 10MB file trashes a 2GB machine by Anonymous Monk
in thread Tokenising a 10MB file trashes a 2GB machine by PetaMem

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