[zeromq-dev] Handling high socket or connection counts

Michel Pelletier pelletier.michel at gmail.com
Thu Feb 6 18:41:22 CET 2014

On Thu, Feb 6, 2014 at 7:09 AM, Goswin von Brederlow <goswin-v-b at web.de>wrote:

> On Thu, Feb 06, 2014 at 01:38:48PM +0100, Olaf Mandel wrote:
> > Hello,
> >

> But what if you don't use threads? Then inproc won't work. But also
> you don't have a limit of 1024 sockets. Only 1024 file descriptors per
> executable. By forking or starting seperate executables you can have
> many more sockets, colletively. How much more? There are only 65536
> ports and 0-1023 is reserved for root. So you won't get verry far with
> tcp.

It's true a client can only make ~60K outgoing connections (due to
ephemeral port exhaustion) but a server with bound sockets can have up to
64K connections _per port_.  Here's a blog post from urban airship
detailing their experiments with pushing connection limits up to 500K on a
single machine:



> If you need more then you need to use multiple hosts or at least
> containers with different IPs.
> Or use unix domain sockets so you are not limited by the number of
> ports for tcp.
> MfG
>         Goswin
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