[Building Sakai] NeoChat for production use?
Adrian Fish
adrian.r.fish at gmail.com
Tue Feb 19 06:58:43 PST 2013
Sorry, Neochat and floating chat are the same thing.
On 19 February 2013 14:58, Adrian Fish <adrian.r.fish at gmail.com> wrote:
> The numbers are the same. Neochat just makes HTTP connections via
> Javascript in the browser. Every 5 seconds each logged in user generates 1
> request. The requests may occur at the same time, they may not. The worst
> possible case is that 500 currently logged in users generate 500 requests
> simultaneously every 5 seconds. In reality, those requests will be
> distributed evenly in the 5 second envelope, but accounting for the worst
> case makes sense.
>
> That sounds like a lot of concurrent requests, Dan. You may have a
> thousand Sakai sessions active but that will rarely equate to a thousand
> HTTP requests coming in at the same time.
>
> Adrian.
>
>
> On 19 February 2013 12:54, Daniel Merino <daniel.merino at unavarra.es>wrote:
>
>> Hi everybody.
>>
>> I don't understand very well if you are talking about Sakai's concurrent
>> users or NeoChat's concurrent users. Is the same? Does every Sakai user
>> launch a NeoChat connection even if he doesn't use it?
>>
>> Being a quite small university, we have between 500 and 1000 concurrent
>> sessions per node. At least, that is what our sysadmin has told me...
>>
>> Best regards.
>>
>> Neal Caidin escribió:
>> > For the documentation, how about something like:
>> >
>> > "NeoChat - experimental feature - performance concerns exist for large
>> > installations. Guidelines - if deploying NeoChat it is recommended to
>> > deploy one app node per 250 concurrent sessions. While no issues have
>> > been found in performance tests to date, Neochat increases the number
>> > of requests sent to Sakai, so monitor your system closely. "
>> >
>> > ?
>> >
>> > -- Neal
>> >
>> >
>> > On Feb 19, 2013, at 7:20 AM, Adrian Fish <adrian.r.fish at gmail.com
>> > <mailto:adrian.r.fish at gmail.com>> wrote:
>> >
>> >> How many concurrent users? Each logged in user on a neochat enabled
>> >> Sakai will be polling every 5 seconds. The requests don't take long,
>> >> but still. If you expect 500 concurrent users you should probably
>> >> cluster with 250 on each of two app nodes. I don't see any problem
>> >> with those load levels.
>> >>
>> >> The only way to decrease the hit on the tomcats would be to start
>> >> using websockets so the polling can be dropped. I don't think enough
>> >> people are using websocket enabled browers yet for that to be
>> >> feasible. You could increase the poll interval but this reduces the
>> >> immediacy of the chat experience, thus defeating the object really.
>> >>
>> >> Adrian.
>> >>
>> >>
>> >> On 19 February 2013 12:08, Alexandre Ballesté
>> >> <alexandre.balleste at udl.cat <mailto:alexandre.balleste at udl.cat>>
>> wrote:
>> >>
>> >> Did anybody try with big site? 5000+ users.
>> >>
>> >> Thanks!
>> >>
>> >> On 02/19/2013 01:05 PM, Juan José Meroño Sánchez wrote:
>> >> > I did some performance testing on it for 2.9.0 and I didn't
>> >> find issues,
>> >> > I think the confluence page needs qualifying too, but not
>> >> completely
>> >> > remove the warning.
>> >> > This feature (neochat) increases the number of requests sent to
>> >> sakai,
>> >> > so this needs a warning, but not a fatal message that will
>> >> scare people.
>> >> > Its also important to have people using the feature.
>> >> >
>> >> > Cheers.
>> >> >
>> >> > El 19/02/2013 11:50, Pablo San Roman Bengoetxea escribió:
>> >> >> Hi all,
>> >> >>
>> >> >> We are interested in NeoChat but we have seen in the document
>> >> of new
>> >> >> funcionalities (
>> >> >>
>> >>
>> https://confluence.sakaiproject.org/display/DOC/Sakai+CLE+2.9+Release+Notes+-+What%27s+New
>> >> >> ) that it is not recommended for production, only for small
>> scale
>> >> >> exploration. We are not sure if this state continues so we
>> >> would like to
>> >> >> know if somebody is currently using NeoChat in production.
>> >> >>
>> >> >> thanks,
>> >> >> Regards.
>> >> >>
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>> >>
>> >> --
>> >> Alexandre Ballesté Crevillén alexandre.balleste at udl.cat
>> >> <http://udl.cat/>
>> >> =====================
>> >> Universitat de Lleida
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>> >> =====================
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>> --
>> Daniel Merino Echeverría
>> daniel.merino at unavarra.es
>> Gestor de teleformación - Centro Superior de Innovación Educativa.
>> Tfno: 948-168489 - Universidad Pública de Navarra.
>> --
>> Tener hijos es muy fácil. Les puedes enseñar a odiar lo que tú odias, y
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