• NAME
• VERSION
• SYNOPSIS
• DESCRIPTION
• METHODS
  • Class Methods
  • Instance Methods
• AUTHOR
• BUGS
• SUPPORT
• SEE ALSO
• LICENSE AND COPYRIGHT

NAME

Memory::Usage - Tools to determine actual memory usage

VERSION

Version 0.201

SYNOPSIS

    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
    $object->something_memory_intensive();

    # Record amount in use afterwards
    $mu->record('after something_memory_intensive()');

    # Spit out a report
    $mu->dump();

DESCRIPTION

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

METHODS

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

AUTHOR

Dave O'Neill, <dmo at dmo.ca>

BUGS

Please report any bugs or feature requests to bug-memory-usage at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Memory-Usage. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

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

    perldoc Memory::Usage

You can also look for information at:

• RT: CPAN's request tracker

  http://rt.cpan.org/NoAuth/Bugs.html?Dist=Memory-Usage

• Search CPAN

  http://search.cpan.org/dist/Memory-Usage/

SEE ALSO

• Memchmark

  Iteratively run coderefs (similar to Benchmark) and compare their memory usage. Useful for optimizing specific subroutines with large memory usage once you've identified them as memory hogs. Uses same technique for gathering usage information as this module, so accuracy and precision suffer similarly.

• Devel::Size

  Show the size of Perl variables. Also useful for microoptimzations when you know what you're looking for. Looks at Perl internals, so accuracy is good.

LICENSE AND COPYRIGHT

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 http://dev.perl.org/licenses/ for more information.