Devel::LeakTrace::Fast - indicate where leaked variables are coming from.


  perl -MDevel::LeakTrace::Fast -e '{ my $foo; $foo = \$foo }'
  leaked SV(0x528d0) from -e line 1
  leaked SV(0x116a10) from -e line 1


Devel::LeakTrace::Fast is a rewrite of Devel::LeakTrace. Like Devel::LeakTrace it uses the pluggable runops feature found in perl 5.6 and later in order to trace SV allocations of a running program.

At END time Devel::LeakTrace::Fast identifies any remaining variables, and reports on the lines in which the came into existence.

Note that by default state is first recorded during the INIT phase. As such the module will not pay attention to any scalars created during BEGIN time. This is intentional as symbol table aliasing is never released before the END times and this is most common in the implicit BEGIN blocks of use statements.


Improve the documentation.

Clustering of reports if they're from the same line.

Stack backtraces to suspect lines.


Andy Armstrong <>

Originally based on code by Richard Clamp that carried this attribution:

Richard Clamp <> with portions of LeakTrace.xs taken from Nick Ing-Simmons' Devel::Leak module.


Copyright (c) 2007, Andy Armstrong <>. All rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.


Devel::Leak, Devel::Cover