> -How does the cpu utilization look compared between the lfsr and default tausworthe generators? Is the cpu util actually higher on lfsr? It is actually less when using LFSR with 16 volumes: Without LFSR (CPU utilization is 5th column): [root@sm28 ~]# ps -eLo ppid,pid,pri,psr,pcpu,stat,wchan:14,comm | grep fio PPID PID PRI PSR %CPU STAT WCHAN COMMAND 2239 24684 19 0 0.7 Sl+ hrtimer_nanosl fio 2239 24684 19 0 0.2 Sl+ futex_wait_que fio 2239 24684 19 3 60.4 Rl+ - fio 2239 24684 19 6 60.5 Sl+ - fio 2239 24684 19 1 61.2 Rl+ - fio 2239 24684 19 23 62.5 Sl+ - fio 2239 24684 19 7 60.6 Rl+ - fio 2239 24684 19 18 61.0 Rl+ - fio 2239 24684 19 16 61.0 Rl+ - fio 2239 24684 19 4 62.0 Rl+ - fio With LFSR: [root@sm28 ~]# ps -eLo ppid,pid,pri,psr,pcpu,stat,wchan:14,comm | grep fio 2239 25589 19 20 2.7 Sl+ hrtimer_nanosl fio 2239 25589 19 25 0.3 Sl+ futex_wait_que fio 2239 25589 19 16 80.1 Rl+ - fio 2239 25589 19 22 78.0 Rl+ - fio 2239 25589 19 5 82.6 Rl+ - fio 2239 25589 19 4 78.0 Rl+ - fio 2239 25589 19 18 82.7 Rl+ - fio 2239 25589 19 17 80.7 Sl+ 14051005663345 fio 2239 25589 19 23 76.6 Sl+ - fio 2239 25589 19 0 77.6 Rl+ - fio But almost the same with 1 volume: Without LFSR [root@sm28 ~]# ps -eLo ppid,pid,pri,psr,pcpu,stat,wchan:14,comm | grep fio 2239 27559 19 7 4.0 Sl+ hrtimer_nanosl fio 2239 27559 19 2 0.0 Sl+ futex_wait_que fio 2239 27559 19 18 79.4 Rl+ - fio 2239 27559 19 17 79.0 Rl+ - fio 2239 27559 19 6 78.6 Rl+ - fio 2239 27559 19 5 77.6 Rl+ - fio 2239 27559 19 23 82.6 Rl+ - fio 2239 27559 19 3 77.4 Rl+ - fio 2239 27559 19 4 77.1 Sl+ - fio 2239 27559 19 16 75.9 Rl+ - fio With LFSR: [root@sm28 ~]# ps -eLo ppid,pid,pri,psr,pcpu,stat,wchan:14,comm | grep fio 2239 27174 19 20 2.0 Sl+ hrtimer_nanosl fio 2239 27174 19 25 0.0 Sl+ futex_wait_que fio 2239 27174 19 16 80.0 Rl+ - fio 2239 27174 19 6 78.4 Rl+ - fio 2239 27174 19 3 77.5 Rl+ - fio 2239 27174 19 5 76.4 Sl+ - fio 2239 27174 19 19 77.1 Rl+ - fio 2239 27174 19 4 76.4 Rl+ - fio 2239 27174 19 7 77.0 Rl+ - fio 2239 27174 19 1 75.8 Rl+ - fio > -Does a runtime of 2 minutes collect enough data points to assess the condition? What happens if you extend the runtime? Yes, it does. Shortening the test to 20 sec or extending to 10 min, doesn’t change a thing. -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
