[zeromq-dev] Over Unix Domain Sockets?

Martin Sustrik sustrik at fastmq.com
Tue Sep 15 10:40:02 CEST 2009

Steven McCoy wrote:
> 2009/9/15 Martin Sustrik <sustrik at fastmq.com <mailto:sustrik at fastmq.com>>
>     If I was the developer the first thing I would do would be to find out
>     which existing IPC mechanism is the most efficient: Pipes? Loopback
>     sockets? Shared memory?
>  From previous experience it can different on every platform.  HP/UX for 
> example has faster Unix sockets than shared memory, but any luck that 
> has since improved.

This is a useful piece of information. The consequence IMO is that the 
IPC message transfer should be implemented with an option of switching 
to different IPC mechanism on mind - same way as we can use select, 
poll, epoll, dev/poll or kqueue as a polling mechanism depending on the 
OS platform.

> I would start with Unix sockets by taking the existing TCP sockets and 
> simply updating the configuration to support the different naming scheme.

Yup. That seems to be the easiest way to start.

> For shared memory I presume you can implement a lock-less wait-free 
> queue using atomic ops, you could also try new system calls on Linux 
> like vmsplice() to turn the shared memory into a pipe.

Yes, this can be done later on as an optimisation.


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