[Server-devel] notes on scaling ejabberd for the XO's

[Dev Mohanty]

More info available on the wiki at:
http://wiki.laptop.org/go/Ejabberd_Configuration#Patches

On 3/11/09, Bryan Berry <bryan at olenepal.org> wrote:
>
> Here are some notes from a short IRC conversation I had w/ Rob Mcqueen,
> the lead developer of Telepathy
>
> transcript of conversation on #sugar
> bemasc: bernie: I am concerned about the fact that in the default
> schoolserver set up all users are in one giant shared roster
> <Robot101> RESOLVED, ALREADYFIXED (but not in any deployments, or in the
> UI)
> <BryanWB> and the resulting chatter slows down the XO/Sugar
> considerably?
> <Robot101> yes
>   Robot101 rwh
>   the latest versions of sugar and telepathy support using an XMPP
> component called gadget
>   instead of the shared roster
> <BryanWB> Robot101: so gadget fixes this?
> <Robot101> yup
>   Robot101 rwh
>   you only receive push notifications about a) what Sugar has searched
> for/displaying on the neighborhood view, or b) your friends
> --> hgcphoenix (n=hchua at 124.107.253.193) has joined #sugar
> <BryanWB> Robot101: neat, and does it work together w/ the XS?
>   Robot101: which version of sugar is it in?
> <-- hgcphoenix (n=hchua at 124.107.253.193) has left #sugar
> <Robot101> they went off on a complete tangent trying to hack shared
> rosters to have less mutually visible sets of people
>   we thought of that but also decided it was the bong, so we fixed it
> properly with gadget.
> <BryanWB> Robot101: what is the testing status of gadget?
> <Robot101> it's deployed on jabber.sugarlabs.org (which is on
> collabora.co.uk)
>   seems to work fine, ejabberd seems to gradually leak memory though,
> which isn't too great
>   maybe a little much CPU usage on gadget, but nothing you couldn't
> profile
>   and I'm not familiar enough with the sugar release cycle to say where
> the support went in
>   Robot101 rwh
>   eu daytime is better to find the Sugar devs and the Collaborans who
> worked on Gadget
>   (cassidy, daf)
> <BryanWB> Robot101: ok, will talk w/ them later today
> <Robot101> gadget was always our plan, it just took us a while to get to
> it
> <BryanWB> Robot101: by the way last year we tested ejabberd by streaming
> your video talk on Telepathy to 80 XO's
> <bemasc> Robot101: I believe martin dropped the shared roster, and
> inside is simply using moodle to set all rosters directly.
>   s/inside/instead/
>   bemasc bernie benzea
> <Robot101> bemasc: so it's still shared as in server-enforced mutual
> visibility, just in smaller groups.
> <bemasc> right, but from ejabberd's perspective, it's individual rosters
> <Robot101> that's exactly how shared rosters always work
> <Robot101> the client thread gets a copy of the same roster at sign in
> <bemasc> oh? I thought there was a patch to ejabberd required.
> <Robot101> yes, he's patched it to source the shared roster from moodle,
> I'd imagine
> <bemasc> martin seemed to say that he could use a totally stock ejabberd
> <Robot101> oh, right. sql query or something. our patches were just
> extending the built-in shared roster to a) work properly (deal with
> dynamic additions and removals) and b) support a group of online users
> rather than everyone
>
>
> --
> Bryan W. Berry
> Technology Director
> OLE Nepal, http://www.olenepal.org
>
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>
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