[erlang-questions] Backpressure

[Jon Watte]

Is there a good counter or other way of instrumenting this send queue, btw?
(I'm using R13B3 but am starting to feel like I have to upgrade at some
point...)

Sincerely,

jw


--
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whether we get there willingly or not, we shall soon have lower consumption
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On Thu, Jul 28, 2011 at 1:10 PM, Ulf Wiger
<ulf.wiger@REDACTED>wrote:

>
> On 28 Jul 2011, at 20:16, Jay Nelson wrote:
>
> >> Ulf Wiger wrote:
> >
> >> The problems with Distributed Erlang are related to a heavy-handed
> backpressure solution, where processes trying to send to the dist_port are
> simply suspended if the output queue exceeds a given threshold.
> >
> > Does this only apply to distributed erlang? What about punishment of
> processes communicating within a node? I've seen senders using more time in
> local comms*.
>
> Only Distributed Erlang. Local message passing does come with a form of
> backpressure too, as senders are punished with extra reductions if the
> receiver's message queue is big. I think this feature should go away, as it
> makes the message send more complex from a scalability point of view, but I
> know others like it… One can probably reduce locking by allowing the queue
> length value to be somewhat old, for example.
>
> BR,
> Ulf W
>
> Ulf Wiger, CTO, Erlang Solutions, Ltd.
> http://erlang-solutions.com
>
>
>
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