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Profile memory usage of Catalyst requests
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README.mkdn

NAME

Catalyst::Plugin::MemoryUsage - Profile memory usage of requests

VERSION

version 0.3.0

SYNOPSIS

In YourApp.pm:

package YourApp;

use Catalyst qw/
    MemoryUsage
/;

In a Controller class:

sub foo :Path( '/foo' ) {
     # ...


     something_big_and_scary();


     $c->memory_usage->record( 'finished running iffy code' );


     # ...
}

In yourapp.conf:

<Plugin::MemoryUsage>
    report            1
    action_milestones 1
</Plugin::MemoryUsage>

DESCRIPTION

Catalyst::Plugin::MemoryUsage adds a memory usage profile to your debugging log, which looks like this:

[debug] memory usage of request .--------------------------------------------------+------+------+------+------+------+------+------+------+------+------. | | vsz | del- | rss | del- | sha- | del- | code | del- | data | del- | | | | ta | | ta | red | ta | | ta | | ta | +--------------------------------------------------+------+------+------+------+------+------+------+------+------+------+ | preparing for the request | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | after TestApp::Controller::Root : root/_BEGIN | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | after TestApp::Controller::Root : root/_AUTO | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | in the middle of index | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | after TestApp::Controller::Root : root/index | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | after TestApp::Controller::Root : root/_ACTION | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | after TestApp::Controller::Root : root/_END | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | | after TestApp::Controller::Root : root/_DISPATCH | 28M | | 22M | | 2.2M | | 1.1M | | 20M | | '--------------------------------------------------+------+------+------+------+------+------+------+------+------+------'

CONFIGURATION

report

If true, the memory usage is reported automatically (at debug level) at the end of the request.

Defaults to true if we are in debugging mode, false otherwise.

action_milestones

If true, automatically adds milestones for each action, as seen in the DESCRIPTION.

Defaults to true if we are in debugging mode, false otherwise.

METHODS

memory_usage()

Returns the Memory::Usage object available to the context.

To record more measure points for the memory profiling, use the record() method of that object:

sub foo :Path {
    my ( $self, $c) = @_;

    ...

    big_stuff();

    $c->memory_usage->record( "done with big_stuff()" );

    ...
}

reset_memory_usage()

Discards the current Memory::Usage object, along with its recorded data, and replaces it by a shiny new one.

BUGS AND LIMITATIONS

Memory::Usage, which is the module Catalyst::Plugin::MemoryUsage relies on to get its statistics, only work for Linux-based platforms. Consequently, for the time being Catalyst::Plugin::MemoryUsage only work on Linux and NetBSD. This being said, patches are most welcome. :-)

SEE ALSO

Memory::Usage

AUTHOR

Yanick Champoux yanick@babyl.dyndns.org

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by Yanick Champoux.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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