NAME
Internals::CountObjects - Report all allocated perl objects
SYNOPSIS
use Internals::CountObjects;
print dump_objects();
DESCRIPTION
This module provides a simple count of each kind of object in memory. It
can be used as an ordinary perl module or injected into running
processes in production emergencies.
An example report, including the process ID on each line:
=7201= Memory stats
=7201= undef: 1176
=7201= REF: 781
=7201= ARRAY: 484
=7201= GLOB: 388
=7201= string/integer: 262
=7201= integer: 253
=7201= CODE: 162
=7201= string/double: 139
=7201= HASH: 87
=7201= REGEXP: 60
=7201= IO::File: 8
=7201= version: 3
=7201= double: 3
=7201= FORMAT: 2
=7201= string: 1
=7201= Config: 1
FUNCTIONS
dump_objects()
Returns a formatted report.
dump_objects($prev_objects)
Returns a formatted report, showing the differences between a previous
call to "objects()".
$objects = objects();
# do something
print dump_objects($objects);
Memory stats (delta from previous)
=2628= integer: 272 (+11)
=2628= REF: 798 (+4)
=2628= string/integer: 272 (+2)
=2628= string: 2 (+1)
=2628= ARRAY: 493 (+1)
=2628= double: 4 (+1)
=2628= HASH: 90 (+1)
=2628= FORMAT: 2
=2628= IO::File: 8
=2628= version: 3
=2628= CODE: 164
=2628= Config: 1
=2628= REGEXP: 60
=2628= GLOB: 394
=2628= string/double: 139
=2628= undef: 1362 (-21)
objects()
Returns the data used for the report in a hash reference. An example of
a typical hash:
%report = (
'undef' => 1176,
'REF' => 781,
'ARRAY' => 484,
'GLOB' => 388,
'string/integer' => 262,
'integer' => 253,
'CODE' => 162,
'string/double' => 139,
'HASH' => 87,
'REGEXP' => 60,
'IO::File' => 8,
'version' => 3,
'double' => 3,
'FORMAT' => 2,
'string' => 1,
'Config' => 1
);
IN EMERGENCIES
You can get this kind of report from a running perl / httpd process. You
attach to the process with gdb and eval() some ordinary perl code.
In the below example, we'll pick a httpd, attach to it and eval some
perl to get a report. It's a good idea to kill the process off
afterward.
$ ps ax | grep httpd
11340 pts/1 t 0:00 grep httpd
11342 ? Ss 0:12 /usr/bin/httpd -f /var/www/conf/httpd.conf
11343 ? S 0:03 /usr/bin/httpd -f /var/www/conf/httpd.conf
11344 ? S 0:00 /usr/bin/httpd -f /var/www/conf/httpd.conf
11346 ? R 0:00 /usr/bin/httpd -f /var/www/conf/httpd.conf
$ gdb -p 11346
(gdb) call Perl_eval_pv("use Internals::CountObjects; print STDERR dump_objects()", 0)
(gdb) detach
(gdb) quit