What is the "x runs sampled" in the output results?

[aweiu]

At first, I thought it was the number of executions of suite, but it was not.

I didn't find the detailed concept of sample on the Internet, benchmark The js source code is not understood.

The approximate guess is:

1. The sample means how many samples have been executed.
2. Each sample contains N executions of suite.
3. Each sample has a fixed execution time

I don't know if the above conjecture is correct. Please give me some advice. Thank you!