Chad Granum


Devel::Memalyzer - Base framework for analyzing program memory usage


Devel-Memalyzer is a base framework for analyzing program memory usage. You can use it to run a program and collect statistics about overall memory usage, or you can use it in your code itself and record statistics at specific points.


To run a program and collect overall statistics:

    $ output.csv "perl -I lib -e 'use MyModule; MyModule->go'"
    $ output.csv "scripts/"

If you needed to interrupt the process you can use the data that was collected:

    $ output.csv

This will take output.csv.head and output.csv.raw and combine them to create output.csv. This is done automatically if your program finishes itself.


You can also use memalyzer in a program:

    use Devel::Size qw(size total_size);
    use Devel::Memalyzer;
    my $mem = Devel::Memalyzer->new( ... );

    my $obj = MyObj->new;

    # This will add columns to the output.
    for my $thing ( @things ) {
        $mem->add_column( $thing => sub { total_size( obj->$thing )})

    while ( $obj->iteration ) {
        # Records data from plugins as well as your custom columns.

This will produce output.csv.head and output.csv.raw, to combine them:

    $ output.csv


Sometimes you want to use Memalyzer in a broader scope and don't want to worry about passing your object around, in these cases you can use it as a singleton.

    use Devel::Memalyzer

        output => 'output.csv',
        plugins => [ 'Devel::Memalyzer::Plugin::ProcStatus' ];

    my $mem = Devel::Memalyzer->singleton;

You can also initialize the singleton at use-time:

    use Devel::Memalyzer output => 'output.csv',
                         plugins => [ 'Devel::Memalyzer::Plugin::ProcStatus' ];

    my $mem = Devel::Memalyzer->singleton;


These are the methods useful to the average user.

$obj = $class->new( output => $file, plugins => [ ... ])

Create a new instance of Devel-Memalyzer

$obj = $class->init( output => $file, plugins => [ ... ])

Initialize the singleton instance of Devel-Memalyzer

$obj = $class->singleton()

Retrieve the singleton instance of Devel-Memalyzer


Write current memory statistics to the data files

$obj->add_column( name => sub { ... })

Add a column to future output. The column will have the provided name. The coderef should return the value that will be inserted into data rows under the specified column.

$obj->del_column( 'name' )

Remove a row from future output (previously recorded rows will not be modified)


Close the filehandles, you will need to do this if you want to use combine() and the instance has not been destroyed or is a singleton.


Chad Granum


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