$ valgrind perl a.pl
==17235== Memcheck, a memory error detector
==17235== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==17235== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info
==17235== Command: perl a.pl
==17235== 
==17235== Stack overflow in thread 1: can't grow stack to 0xbe01ef78
==17235== 
...