Memory::Usage(3) Tools to determine actual memory usage


Version 0.201


use Memory::Usage;
my $mu = Memory::Usage->new();
# Record amount of memory used by current process
$mu->record('starting work');
# Do the thing you want to measure
# Record amount in use afterwards
$mu->record('after something_memory_intensive()');
# Spit out a report


This module lets you attempt to measure, from your operating system's perspective, how much memory a process is using at any given time.


Class Methods

new ( )
Creates a new Memory::Usage object. This object will contain usage state as recorded along the way.

Instance Methods

record ( $message [, $pid ])
Record the memory usage at call time, logging it internally with the provided message. Optionally takes a process ID to record memory usage for, defaulting to the current process.
report ( )
Generates report on memory usage.
dump ( )
Prints report on memory usage to stderr.
state ( )
Return arrayref of internal state. Returned arrayref contains zero or more references to arrays with the following columns (in order). All sizes are in kilobytes.
timestamp (in seconds since epoch)
message (as passed to ->record())
virtual memory size
resident set size
shared memory size
text (aka code or exe) size
data and stack size


Dave O'Neill, "<dmo at>"


Please report any bugs or feature requests to "bug-memory-usage at", or through the web interface at <>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

    perldoc Memory::Usage

You can also look for information at:


Copyright 2010 Dave O'Neill.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See for more information.