Python based publish subscribe middleware

Is there a scalable, python based publish subs开发者_Go百科cribe middleware available? I tried RabbitMQ, but it does not scale well over 32-64 nodes.

I need a middleware that could run over >1000 nodes

Thanks

It depends on what do you mean about 'scalability'. RabbitMQ is designed for high stability with scalability.

There is also ZeroMQ, designed for very high performance (but less features). You can see the performance tests of ZeroMQ.