Redis job creating throughput

How is measured the performance (throughput) chart at the top of this page?

With Redis RDB I am getting throughput around 200 job creations per second. If I try to do it in parallel, I can get around 400 job creations per second even with simple example:

Configuration
Job enqueuing

But the chart in the article shows around 6 000 job creations per second. I have tried multiple machines and Redis instances with different HW and parameters, but it was always around the same.

What job creation speeds are you getting with your configuration?