[Seaside] Workaround to browser maximum connection limit ?

[Paul DeBruicker]

As far as I know there isn't HTTP/2 support available in any of the Smalltalk
HTTP clients but as the gems can only process one request at a time it
shouldn't matter.  Do HTTP/2 to your nginx, then split those requests among
your gems round robin.  Or I think if you pay for nginx you can choose which
backend to send a request to based on its busy-ness.







Mariano Martinez Peck wrote
> On Mon, Mar 20, 2017 at 10:11 PM, Paul DeBruicker <

> pdebruic@

> >
> wrote:
> 
>> Are you using HTTP/2 in your nginx config?
>> https://en.wikipedia.org/wiki/HTTP/2  It both multiplexes & pipelines
>> requests so the browser's limits have less, if no effect.
>>
>>
> Yes, this is very interesting idea. Do you have such a setup working with
> Seaside and GemStone?
> I am compiling now newer version of nginx with ALPN support and correct
> version of SSL on CentOS7.
> But I am not sure what else must be done to close the loop so that to be
> sure HTTP2 is used everywhere.
> Do I need to do something on the Seaside adaptors?
> 
> 
> 
>>
>>
>> Could also maybe adapt the functionality of the lazy-loading code that is
>> sometimes used for images.  If the report isn't on the screen & hasn't
>> been
>> scrolled to do you really need it in the DOM?
>>
>>
>>
>>
>>
>>
>>
>> Mariano Martinez Peck wrote
>> > Hi guys,
>> >
>> > In my app I have one scenario where we render huge reports. These
>> reports
>> > could have say... 20/30 large tables as well as quite some charts and
>> some
>> > other report elements.
>> >
>> > Previously we were using a single ajax request to generate the whole
>> > report
>> > html but that was a pain because client machine would have a really
>> large
>> > TTFB. So I was wasting CPU and network at client machine while waiting.
>> >
>> > What we did now is that each report element renders a title + spinning
>> > while and does an ajax request which, on success does a #replaceWith:
>> > with
>> > the real contents. The idea is to show the report as soon as possible
>> and
>> > start replacing spinning wheels with real contents as soon as content
>> is
>> > ready. That way I maximize CPU and network on client side.
>> >
>> > The second thing is that making this on AJAX calls, that would end up
>> on
>> > different Gems on my GemStone which was very performant. I have 10
>> Seaside
>> > gems on a 8 cores CPU so all those AJAX request were load balanced via
>> > nginx over the 10 seaside gems, which on the other hand were split
>> across
>> > all cores. Previously, with a single request, only one Gem took care
>> and
>> > hence only one CPU core was used.
>> >
>> > This change was nice and improved performance. However, when I analyze
>> > requests, I see that I have many that are "Stalled". And yeah, on
>> Chrome,
>> > they are all stalled when there is more than 6 requests to the same
>> > location.
>> >
>> > To conclude, it looks like i am doing what is called "Loading page
>> content
>> > with many Ajax requests" [1]. But I still don't find an easy
>> workaround.
>> I
>> > would like to be able to use my 10 Gems over the 8 CPU cores....
>> >
>> > Any idea?
>> >
>> > Thanks in advance,
>> >
>> >
>> > [1]
>> > http://sgdev-blog.blogspot.com.ar/2014/01/maximum-
>> concurrent-connection-to-same.html
>> >
>> >
>> > --
>> > Mariano
>> > http://marianopeck.wordpress.com
>> >
>> > _______________________________________________
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>>
>> > seaside at .squeakfoundation
>>
>> > http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
>>
>>
>>
>>
>>
>> --
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> 
> 
> 
> -- 
> Mariano
> http://marianopeck.wordpress.com
> 
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