Load testing tool to generate up to 50K req.sec in AWS

I'm looking for a light weight open source load testing tool which conforms to the following criteria:

1. Capable to generate up to 50K requests per second(potentially more) to the REST API with mature HTTP support: methods, automatic management of client connections and cookies. SSL. e.t.c.


2. Has a proven track record of successful load tests generating heavy workload in AWS. Positive AWS experience is critical. Any comments(links) on load testing in AWS generating similar workloads are welcome too.


3. It is really light weight. We expect to use several load generator instances not dozens of them.


4. Flexible parametrization.


5. Reasonable reporting features. Aggregated metrics(avg, percentiles, throughput), graphs.

At the moment I stick to tool called tsung, but still researching the topic.