关于 fio 延迟指标的选择和计算

是这样的，我写了 fio 测试脚本，然后有观众提议放个读写延迟上去。我现在有点纠结应该放哪个数值. 我打算取"lat_ns"的"mean" 也就是值 2718863.941184 。 不知道这个是否合理？ 这个值我要不要再除以 11292449 ？有点噶住了

{ "jobname" : "read,RND4K-Q32T16", "groupid" : 10, "error" : 0, "eta" : 0, "elapsed" : 786, "job options" : { "name" : "read,RND4K-Q32T16", "rw" : "randread", "iodepth" : "32", "bs" : "4k", "numjobs" : "16" }, "read" : { "io_bytes" : 46253879296, "io_kbytes" : 45169804, "bw_bytes" : 770782370, "bw" : 752717, "iops" : 188170.991018, "runtime" : 60009, "total_ios" : 11291953, "short_ios" : 0, "drop_ios" : 0, "slat_ns" : { "min" : 1780, "max" : 19582823, "mean" : 11969.273414, "stddev" : 18417.052843, "N" : 11291955 }, "clat_ns" : { "min" : 74196, "max" : 35534486, "mean" : 2706894.667020, "stddev" : 1860837.645574, "N" : 11292449, "percentile" : { "1.000000" : 522240, "5.000000" : 716800, "10.000000" : 888832, "20.000000" : 1187840, "30.000000" : 1499136, "40.000000" : 1843200, "50.000000" : 2211840, "60.000000" : 2670592, "70.000000" : 3194880, "80.000000" : 3948544, "90.000000" : 5210112, "95.000000" : 6520832, "99.000000" : 8847360, "99.500000" : 9633792, "99.900000" : 11730944, "99.950000" : 13565952, "99.990000" : 20578304 } }, "lat_ns" : { "min" : 228921, "max" : 35536822, "mean" : 2718863.941184, "stddev" : 1860842.689662, "N" : 11292449 }, "bw_min" : 697879, "bw_max" : 810166, "bw_agg" : 100.000000, "bw_mean" : 753568.975000, "bw_dev" : 1207.788641, "bw_samples" : 1920, "iops_min" : 174463, "iops_max" : 202538, "iops_mean" : 188389.150000, "iops_stddev" : 301.956112, "iops_samples" : 1920 }, 。。。。。 },