[j-nsp] Multi Core on JUNOS?
p.mayers at imperial.ac.uk
Thu Oct 22 08:12:59 EDT 2015
On 22/10/15 13:05, Saku Ytti wrote:
> On 22 October 2015 at 14:31, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk> wrote:
>> I see, so no possibility to offload BGP to another node nor multi-chassis capability in Junos right?
>> With regards to IPC, there got to be some XR folks in Juniper so where's the holdup :)
> IOS-XR seems to have fair share problems with the IPC :)
In fairness, concurrency is "teh hardz" on any platform, in any framework.
You can use threads and shared memory then problems two you have.
You can bodge it by serialising everything and pushing data between
threads/processes with queues and using craploads of locking, but you
typically want fast CPUs for that. Or you can cheat and coop multitask,
but then you're back at IOS classic / JunOS rpd.
You can write it in a concurrent-friendly language like Erlang (or maybe
Go) but then you have problem employing developers on the cheap, and
have to discard your existing codebase (yikes!)
I'm sympathetic to Juniper/Cisco/etc. here - they've got huge codebases
they can't afford to discard because of the years of accumulated
real-world behavioural tweaks, but proper concurrency typically involves
ground-up design principles.
It's not a solved problem yet :o(
More information about the juniper-nsp