[zeromq-dev] PUB-SUB scalability

[Matt Weinstein]

Doesn't IP MCAST change this to P(M x Z) x F ?
F = burden for reliable pub/sub, perhaps 1.1 or so.

On Aug 16, 2010, at 1:16 PM, Pieter Hintjens wrote:

> On Mon, Aug 16, 2010 at 4:44 PM, Steven Clark <steven.p.clark at gmail.com 
> > wrote:
>
>> I'm interested in how well PUB-SUB scales via TCP.
>
> The maths is fairly simple.  The network traffic will be sum P(S x M  
> x Z) where:
>
> P is the publisher socket
> S is the number of subscribers
> M is the number of messages per second
> Z is the size of messages on average
>
> Summed up over all publisher sockets.
>
>> Any guesses as to how high N could go before things go haywire? Is  
>> the
>> network bandwidth the limiting factor?
>
> Yes, that's all.
>
>> Does the situation improve if I provide a separate PUB socket for  
>> each
>> topic?
>
> Nope.  Don't create multiple PUB sockets for this.
>
> -
> Pieter Hintjens
> iMatix - www.imatix.com
> _______________________________________________
> zeromq-dev mailing list
> zeromq-dev at lists.zeromq.org
> http://lists.zeromq.org/mailman/listinfo/zeromq-dev