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.\" ========================================================================
.\"
.IX Title "Cache::Ref::CART 3pm"
.TH Cache::Ref::CART 3pm "2010-09-23" "perl v5.12.4" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Cache::Ref::CART \- CAR with temporal filtering
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    my $c = Cache::Ref::CART\->new(
\&        size => $n,
\&    );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This algorithm is an extension to Cache::Ref::CAR that has temporal
filtering on the upgrading from \s-1MRU\s0 to \s-1MFU\s0 pool.
.PP
This means that two subsequent accesses to the same key do not automatically
make it viable for long term caching, to get upgraded to \s-1MFU\s0 status a key must
be expired but known in the history.
.PP
This is probably the most general purpose caching algorithm.
.SH "ATTRIBUTES"
.IX Header "ATTRIBUTES"
.IP "size" 4
.IX Item "size"
The size of the live entries.
.Sp
Note that the cache also remembers this many expired keys, and keeps some
metadata about those keys, so for memory usage the overhead is probably around
double what Cache::Ref::LRU requires.
.SH "AUTHOR"
.IX Header "AUTHOR"
Yuval Kogman
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2010 by Yuval Kogman.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.