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   |  root@ceph-1:/mnt/rbd-demo rand_100read_4k: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1 ... fio-3.16 Starting 50 threads rand_100read_4k: Laying out IO file (1 file / 100MiB) Jobs: 50 (f=50): [r(50)][25.5%][eta 08m:55s]                           rand_100read_4k: (groupid=0, jobs=50): err= 0: pid=19546: Wed Mar  1 17:46:39 2023   read: IOPS=1837, BW=7350KiB/s (7526kB/s)(1310MiB/182536msec)     clat (usec): min=314, max=3642.9k, avg=27202.59, stdev=217705.72      lat (usec): min=314, max=3642.9k, avg=27203.14, stdev=217705.73     clat percentiles (usec):      |  1.00th=[    758],  5.00th=[    963], 10.00th=[   1106],      | 20.00th=[   1369], 30.00th=[   1663], 40.00th=[   2147],      | 50.00th=[   3097], 60.00th=[   5342], 70.00th=[   8160],      | 80.00th=[  11600], 90.00th=[  17695], 95.00th=[  24773],      | 99.00th=[  95945], 99.50th=[1635779], 99.90th=[3338666],      | 99.95th=[3472884], 99.99th=[3640656]    bw (  KiB/s): min=  350, max=42945, per=100.00%, avg=17074.17, stdev=301.72, samples=7850    iops        : min=   50, max=10735, avg=4264.67, stdev=75.43, samples=7850   lat (usec)   : 500=0.11%, 750=0.79%, 1000=5.25%   lat (msec)   : 2=31.39%, 4=17.24%, 10=21.04%, 20=16.33%, 50=6.47%   lat (msec)   : 100=0.38%, 2000=0.67%, >=2000=0.33%   cpu          : usr=0.05%, sys=0.16%, ctx=342161, majf=0, minf=49   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%      issued rwts: total=335394,0,0,0 short=0,0,0,0 dropped=0,0,0,0      latency   : target=0, window=0, percentile=100.00%, depth=1
  Run status group 0 (all jobs):    READ: bw=7350KiB/s (7526kB/s), 7350KiB/s-7350KiB/s (7526kB/s-7526kB/s), io=1310MiB (1374MB), run=182536-182536msec
  Disk stats (read/write):   rbd0: ios=337590/6757, merge=1/29, ticks=2274317/134222, in_queue=1793584, util=99.62%    io=1310MiB            bw=7350KIB/s          iops=1837             runt=60001-60001msec 
 
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