On Thu Aug 26 15:41:29 2010, Evgeniy Khramtsov wrote:
27.08.2010 00:16, Stephen Pendleton wrote:
I agree, PEP support isn't so great on the major server platforms.
For
example Openfire's implementation has a memory leak. I think PEP
is one
differentiating factor for XMPP. It would be nice to have solid,
dependable
support in all the major platforms for it.
Lots of bugs in PEP server implementations are because the XEP
itself is written poorly. It doesn't scale: the idea of keeping
resources and features of every user from every server on the
planet is completely insane. Don't be surprised if you see memory
leaks - they are by design :)
Well, I agree it's pretty easy to "leak" subscriptions (we[1] do,
sometimes, if we never see an unavailable from a resource). That's
our bug, and we'll be sorting that one out soon. Otherwise I don't
think there's anything that inherently has a leak associated with it
- even including the fact you gradually learn about every feature of
every client, it's simply not that big a deal.
Honestly, I don't find PEP too much of a pain - it does have a memory
cost, but it's really not astronomical, and the benefits are very
nice for clients and users. We did try turning it off on one large
site briefly (we had to first code in the off-switch), but it made
sufficiently little difference to performance and memory that we
re-enabled it. That site has somewehere approaching 80,000 PEP nodes,
incidentally.[2]
But the lack of PEP on many servers *is* causing us indirect
problems, because services which'd really benefit from PEP
(Buddycloud springs to mind, but there are others) don't use it at
all because it's not available in so many places. I'd love to see a
lot more PEP around, and I think the community as a whole would
benefit enormously.
Dave.
1. That's Isode M-Link, in case you wonder.
2. It's tricky to give an exact figure, but there's around 80,700
pubsub nodes in total, but that includes around 3,000 MUC rooms.
--
Dave Cridland - mailto:[email protected] - xmpp:[email protected]
- acap://acap.dave.cridland.net/byowner/user/dwd/bookmarks/
- http://dave.cridland.net/
Infotrope Polymer - ACAP, IMAP, ESMTP, and Lemonade
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