On Tue, Aug 5, 2008 at 6:07 PM, Brion Vibber <brion(a)wikimedia.org> wrote:
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Simetrical wrote:
On Tue, Aug 5, 2008 at 3:55 PM, Guy Van den
Broeck <guyvdb(a)gmail.com> wrote:
I can't draw any final conclusions with
respect to performance because
I don't have a site of considerable size. I'd appreciate it if
somebody could test this implementation and compare it to the current
php installation.
Any site of considerable size is likely to be running wikidiff2, which
is written in C++ and almost certainly much faster than your PHP
implementation. (Or did you really mean that your PHP code is faster
than the C++ library?) So if your target is big sites, you shouldn't
have written it in PHP.
Diffing is not a significant bottleneck at present with wikidiff2,
however, so a rewrite for performance reasons alone is unlikely to be
productive.
The vast majority of wikis are probably not running wikidiff2 as they're
probably on shared hosting or their admins don't know how to compile and
install a low-level extension, or don't know they should.
Nor does one have to be a "big" site to benefit from diffs that aren't
insanely slow for the "pathological" cases (many bulk changes, or
vandalism that affects a large page being common).
I imagine the Wikimedia sysadmins (for instance)
would be
uninterested in trying out new solutions when an established one works
perfectly well.
The fact that we've got a custom solution means that everyone else gets
shafted with the slow diff that's prone to causing timeouts and can even
be DoSed easily.
Very slow diffs can be a huge problem with RSS feeds, for instance,
which diff many pages for a single request.
In the long run, a hopefully faster, more maintainable diff system could
be a good base to work from in the future -- and to build smarter diff
tools with improved output or a cleaner degrade/failout for ramining
super-slow cases.
- -- brion
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On that note, if this new implementation is default than the standard, and in
fact runs on PHP alone like the standard, is there no particular reason to not
make it the default? Provided it gives the same featureset, that is.
Would offer an improvement to those unable/don't know how to install the C++
version.
-Chad