On 01/27/2015 06:31 PM, Doug Hellmann wrote:
On Tue, Jan 27, 2015, at 12:28 PM, Denis Makogon wrote:
I'd like to build tool that would be able to profile messaging over
various deployments. This "tool" would give me an ability to compare
results of performance testing produced by native tools and
oslo.messaging-based tool, eventually it would lead us into digging into
code and trying to figure out where "bad things" are happening (that's
actual place where we would need to profile messaging code). Correct me
i'm wrong.

It would be interesting to have recommendations for deployment of rabbit
or qpid based on performance testing with oslo.messaging. It would also
be interesting to have recommendations for changes to the implementation
of oslo.messaging based on performance testing. I'm not sure you want to
do full-stack testing for the latter, though.

Either way, I think you would be able to start the testing without any
changes in oslo.messaging.

I agree. I think the first step is to define what to measure and then construct an application using olso.messaging that allows the data of interest to be captured using different drivers and indeed different configurations of a given driver.

I wrote a very simple test application to test one aspect that I felt was important, namely the scalability of the RPC mechanism as you increase the number of clients and servers involved. The code I used is https://github.com/grs/ombt, its probably stale at the moment, I only link to it as an example of approach.

Using that test code I was then able to compare performance in this one aspect across drivers (the 'rabbit', 'qpid' and new amqp 1.0 based drivers _ I wanted to try zmq, but couldn't figure out how to get it working at the time), and for different deployment options using a given driver (amqp 1.0 using qpidd or qpid dispatch router in either standalone or with multiple connected routers).

There are of course several other aspects that I think would be important to explore: notifications, more specific variations in the RPC 'topology' i.e. number of clients on given server number of servers in single group etc, and a better tool (or set of tools) would allow all of these to be explored.

From my experimentation, I believe the biggest differences in scalability are going to come not from optimising the code in oslo.messaging so much as choosing different patterns for communication. Those choices may be constrained by other aspects as well of course, notably approach to reliability.

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