10-25-2012
Quote:
Originally Posted by
Corona688
free() never returns it to the system -- it just puts it in a list so malloc() knows what to recycle next time.
In the open source world, that hasn't been true for about 10 years. Linux (glibc), OpenBSD, NetBSD, and FreeBSD all return memory to the system under certain circumstances (such as free()ing a massive chunk).
I have no idea how the proprietary libcs behave.
The second half of this post about the exact same topic contains excerpts from a couple of malloc/free implementations, with links to their sources:
https://www.unix.com/302717047-post9.html
Regards,
Alister
This User Gave Thanks to alister For This Post:
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LEARN ABOUT CENTOS
test::memory::cycle
Cycle(3) User Contributed Perl Documentation Cycle(3)
NAME
Test::Memory::Cycle - Check for memory leaks and circular memory references
VERSION
Version 1.04
SYNOPSIS
Perl's garbage collection has one big problem: Circular references can't get cleaned up. A circular reference can be as simple as two
reference that refer to each other:
my $mom = {
name => "Marilyn Lester",
};
my $me = {
name => "Andy Lester",
mother => $mom,
};
$mom->{son} = $me;
"Test::Memory::Cycle" is built on top of "Devel::Cycle" to give you an easy way to check for these circular references.
use Test::Memory::Cycle;
my $object = new MyObject;
# Do stuff with the object.
memory_cycle_ok( $object );
You can also use "memory_cycle_exists()" to make sure that you have a cycle where you expect to have one.
FUNCTIONS
"memory_cycle_ok( $reference, $msg )"
Checks that $reference doesn't have any circular memory references.
"memory_cycle_exists( $reference, $msg )"
Checks that $reference does have any circular memory references.
"weakened_memory_cycle_ok( $reference, $msg )"
Checks that $reference doesn't have any circular memory references, but unlike "memory_cycle_ok" this will also check for weakened cycles
produced with Scalar::Util's "weaken".
"weakened_memory_cycle_exists( $reference, $msg )"
Checks that $reference does have any circular memory references, but unlike "memory_cycle_exists" this will also check for weakened cycles
produced with Scalar::Util's "weaken".
AUTHOR
Written by Andy Lester, "<andy @ petdance.com>".
BUGS
Please report any bugs or feature requests to "bug-test-memory-cycle at rt.cpan.org", or through the web interface at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Memory-Cycle>. 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 Test::Memory::Cycle
You can also look for information at:
o AnnoCPAN: Annotated CPAN documentation
<http://annocpan.org/dist/Test-Memory-Cycle>
o CPAN Ratings
<http://cpanratings.perl.org/d/Test-Memory-Cycle>
o RT: CPAN's request tracker
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Test-Memory-Cycle>
o Search CPAN
<http://search.cpan.org/dist/Test-Memory-Cycle>
ACKNOWLEDGEMENTS
Thanks to the contributions of Stevan Little, and to Lincoln Stein for writing Devel::Cycle.
COPYRIGHT
Copyright 2006, Andy Lester, All Rights Reserved.
You may use, modify, and distribute this package under the same terms as Perl itself.
perl v5.16.3 2006-08-07 Cycle(3)