valid_lft forever preferred_lft forever
root@debian:~# sysbench cpu --threads=4 --cpu-max-prime=20000 --time=60 --events=0 run
sysbench 1.0.20 (using system LuaJIT 2.1.1723681758)

Running the test with following options:
Number of threads: 4
Initializing random number generator from current time


Prime numbers limit: 20000

Initializing worker threads...

Threads started!

CPU speed:
events per second: 4539.97

General statistics:
total time: 60.0008s
total number of events: 272413

Latency (ms):
min: 0.80
avg: 0.88
max: 13.55
95th percentile: 0.92
sum: 239905.01

Threads fairness:
events (avg/stddev): 68103.2500/995.95
execution time (avg/stddev): 59.9763/0.00

root@debian:~#