Request rate becomes insanely high when request per second < thread number

[ppppaidy]

Hi. I found in wrk2/src/wrk.c line 104 if request per second is lower than thread number, the throughput becomes 0. I suppose this undefined behavior triggers insanely high actual request rate. This phenomenon even happens in the tutorial deployment in socialNetwork/README.md line 90, where t=12 and R=10. It took me hours to locate this bug since I'm new to the DeathStarBench tool. Thanks!