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Template::Stash::XS August 2001
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Introduction:
* This is an XS implementation of the Template::Stash module, based
in part upon work that Andy Wardley did late last year. It is
an alternative version of the core Template::Stash methods ''get''
and ''set'' (the ones that should benefit most from a speedy C
implementation), along with some virtual methods (like first, last,
reverse, etc.)
Doug Steinwand took the original code and made it into the fast and
fully functional version you see here. Our appreciation is due to
Ticketmaster, Inc. (http://www.ticketmaster.com/) who funded Doug's
work on this to the benefit of us all.
You can run the additional test script ''tt-bench.pl'' to see the
improvement in speed. You may need to install the BSD::Resource
module -- see http://search.cpan.org/search?dist=BSD-Resource
perl tt-bench.pl
Additional Notes:
* Depending upon the size and content of a template, this version
has about twice the speed of the original Template::Stash.
* When a virtual method (like pop, push, nsort, sort etc.) has not
been implemented in XS, it uses these hashrefs in Template::Stash
package -- $HASH_OPS, $LIST_OPS, and $SCALAR_OPS -- to call perl
subroutines that can do the work.
* Using the ''reference'' feature of Template Toolkit -- like
[% a = \foo %] -- leaks a large amount of memory. Enable the
template code at the end of ''tt-bench.pl'' for a demonstration.
(Note: This is a problem in the pure-perl version, too. Also,
you'll need a platform that fully supports getrusage() -- FreeBSD
and IRIX are two that should work. Otherwise, use a utility like
''top''. )
* Although it passes all the tests that I've thrown at it, there may
still be some problems and/or bugs. My primary goal was to mirror
the behavior of the pure-perl version using XS.
(NOTE: The XS Stash has subsequently been tested by numerous people
on the Template Toolkit mailing list and everyone has reported 100%
success and notable speedups - abw)
* Profiling code can be enabled with ''#define TT_PERF_ENABLE'' in
the Stash.xs source, but doing so hurts performance a bit. The
results can be displayed by adding the line:
print Template::Stash::XS::performance(1);
to your code. Use 0 instead of 1 for a more compact display.
* There's no need to try crazy compiler optimizations on this code,
because a majority of time is spent inside Perl's functions.
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