I am testing the controller to do parallel flow addition/deletions, in
order to see how fast the controller can add or delete a large number of
flows. Because in a large network, you may need to add thousands of flows
and it needs to be done in parallel so that the network can be scalable.
You may be correct in saying that Ryu cannot share the connection to the
switch among different processes, but the problem right now is that even if
I just use a single process to add a flow (so no other processes are
conflicting with it or causing interleaving problems), the OFPT_FLOW_MOD
message didn't send according to the Wireshark capture.
On Mon, Apr 24, 2017 at 8:12 PM, William Fisher <william.w.fis...@gmail.com>
wrote:
> On Mon, Apr 24, 2017 at 3:46 PM, Yiwen Shen <ys2...@columbia.edu> wrote:
> >
> > If I just do add_flow(..) by itself the flows will get added properly
> onto the switch, but if I do multiprocessing it doesn't appear. However,
> multiprocessing is the only way I know to do this stuff in parallel. (I've
> tried multithreading, and the flows do get added but because of GIL, it
> isn't truly happening in parallel).
> >
>
> What are you ultimately testing, the controller or the switch? If you are
> optimizing, what is the performance benchmark you are trying to reach?
>
> If you are testing the ability of a switch to process multiple
> simultaneous OpenFlow messages, you should use two separate connections to
> the switch. Perhaps by running two ryu processes listening on different
> ports.
>
> If you are testing the controller, be aware that ryu has one connection to
> the switch and isn't designed to share it between processes. (Even if it is
> possible to share the connection, you may still run into atomicity issues
> where openflow message bytes get interleaved.) If you tried multithreading
> in a single process and that worked for you, that's probably the best you
> can expect.
>
>
--
*Yiwen Shen*
PhD Candidate at Lightwave Research Laboratory
<http://lightwave.ee.columbia.edu/>
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