Assistance with doing pub-sub performance measurement

Hi everybody,

I am trying to measure the time taken to a publish to a pub-sub node which has around 20, 000 subscribers. I was relying on tsung to do my performance measurements, but found that Tsung is very slow while having each of the 20, 000 users subscribe to the single pub-sub node.

I wanted to understand if there is any tool, command-line or web tool that can create a pub-sub node, connect random 20, 000 users and manage the pub-sub created by modifying subscription and having all the 20,000 subscribe to this single node.
Once this is done, I would want to be able to measure performance of a publish call to this node.

Please point me to a tool for the above.

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