How do you create multiple instances of the Ryu controller?
On Tue, Apr 25, 2017 at 7:57 PM, Yi Tseng <a86487...@gmail.com> wrote:
> Hi
>
> In my opinion, you can create multiple instance of Ryu controller, and
> connect switch to all controllers.
>
> You need to design mechanism for syncing flow data between multiple
> controller instances.
>
>
> --Yi
>
> 2017-04-25 12:54 GMT-07:00 Yiwen Shen <ys2...@columbia.edu>:
>
>> Alright thank you. So I guess there is no method to send out multiple
>> flows in parallel by Ryu?
>>
>> On Tue, Apr 25, 2017 at 5:22 AM, Tao Li <tao...@tu-dresden.de> wrote:
>>
>>> I think, even if you only start one single process to add a flow, the
>>> connection (object) between the controller and switch is still owned by the
>>> root process, in which you start your delegate process. In the case that
>>> you want to add more computation capacity, maybe you can perform the
>>> computation inside the additionally created processes and get the results
>>> back to the root process to send out to the switches. But this approach
>>> cannot increase Ryu’s capacity of accepting/sending OF messages, as far as
>>> I can see.
>>>
>>> Best regards,
>>> Tao
>>>
>>> On 25 Apr 2017, at 05:12, Yiwen Shen <ys2...@columbia.edu> wrote:
>>>
>>> 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.fisher@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/>
>>> ------------------------------------------------------------
>>> ------------------
>>> Check out the vibrant tech community on one of the world's most
>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot______
>>> _________________________________________
>>> Ryu-devel mailing list
>>> Ryu-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/ryu-devel
>>>
>>>
>>>
>>
>>
>> --
>> *Yiwen Shen*
>> PhD Candidate at Lightwave Research Laboratory
>> <http://lightwave.ee.columbia.edu/>
>>
>> ------------------------------------------------------------
>> ------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> _______________________________________________
>> Ryu-devel mailing list
>> Ryu-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/ryu-devel
>>
>>
>
>
> --
> Yi Tseng (a.k.a Takeshi)
> Taiwan National Chiao Tung University
> Department of Computer Science
> W2CNLab
>
> https://takeshi.tw
>
--
*Yiwen Shen*
PhD Candidate at Lightwave Research Laboratory
<http://lightwave.ee.columbia.edu/>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel
