This is not needed. Read this and specifically the "Also be patient" part.
I need to know single node how many maximum requests can I process.
It depends... I'd encourage you looking at Rally project to run your benchmarks.
If you have only one node, then that won't help to change the number of replicas. Note that doing a benchmark with one node if you have in production 10 nodes does not make sense to me. You can't extract any valid number from your test.
You should test against a similar platform that you will have in production