valgrind can do this and a lot more. I recommend that, at least in Linux.

boris@foo:~> valgrind perl ~/xxx.pl
==28372== Memcheck, a.k.a. Valgrind, a memory error detector for x86-l
+inux.
==28372== Copyright (C) 2002, and GNU GPL'd, by Julian Seward.
==28372== Using valgrind-1.9.6, a program instrumentation system for x
+86-linux.
==28372== Copyright (C) 2000-2002, and GNU GPL'd, by Julian Seward.
==28372== Estimated CPU clock rate is 1005 MHz
==28372== For more details, rerun with: -v
==28372== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 90 from
+ 2)
==28372== malloc/free: in use at exit: 600146 bytes in 13063 blocks.
==28372== malloc/free: 21262 allocs, 8199 frees, 1013245 bytes allocat
+ed.
==28372== For a detailed leak analysis,  rerun with: --leak-check=yes
==28372== For counts of detected errors, rerun with: -v
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