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@comzyh 2017-02-28T21:57:43.000000Z 字数 13856 阅读 2043

Ceph benchmark with fio

naturali

Local

Seq read

fio -filename=/mnt/cephfs/test10G -direct=1 -iodepth 1 -thread -rw=read -ioengine=psync -bs=16k -size=10G -numjobs=30 -runtime=100 -group_reporting -name=mytest

  1. mytest: (g=0): rw=read, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [R(30)] [100.0% done] [952.2MB/0KB/0KB /s] [60.1K/0/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=28148: Tue Feb 28 21:18:15 2017
  7.   read : io=90252MB, bw=924168KB/s, iops=57760, runt=100001msec
  8.     clat (usec): min=109, max=108820, avg=517.67, stdev=378.03
  9.      lat (usec): min=109, max=108820, avg=517.82, stdev=378.04
  10.     clat percentiles (usec):
  11.      |  1.00th=[  187],  5.00th=[  225], 10.00th=[  249], 20.00th=[  286],
  12.      | 30.00th=[  322], 40.00th=[  370], 50.00th=[  430], 60.00th=[  506],
  13.      | 70.00th=[  596], 80.00th=[  708], 90.00th=[  868], 95.00th=[ 1012],
  14.      | 99.00th=[ 1736], 99.50th=[ 2320], 99.90th=[ 3312], 99.95th=[ 4320],
  15.      | 99.99th=[ 8384]
  16.     bw (KB  /s): min= 4439, max=65856, per=3.33%, avg=30820.65, stdev=9147.53
  17.     lat (usec) : 250=10.38%, 500=48.97%, 750=23.62%, 1000=11.78%
  18.     lat (msec) : 2=4.48%, 4=0.71%, 10=0.05%, 20=0.01%, 50=0.01%
  19.     lat (msec) : 100=0.01%, 250=0.01%
  20.   cpu          : usr=0.52%, sys=7.82%, ctx=6676754, majf=0, minf=1882
  21.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  22.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  24.      issued    : total=r=5776106/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  25.      latency   : target=0, window=0, percentile=100.00%, depth=1
  27. Run status group 0 (all jobs):
  28.    READ: io=90252MB, aggrb=924167KB/s, minb=924167KB/s, maxb=924167KB/s, mint=100001msec, maxt=100001msec

Seq write

fio -filename=/mnt/cephfs/test10G -direct=1 -iodepth 1 -thread -rw=write -ioengine=psync -bs=16k -size=10G -numjobs=30 -runtime=100 -group_reporting -name=mytest

  1. mytest: (g=0): rw=randwrite, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [w(30)] [100.0% done] [0KB/1312KB/0KB /s] [0/82/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=19660: Tue Feb 28 21:56:45 2017
  7.   write: io=562400KB, bw=5605.9KB/s, iops=350, runt=100324msec
  8.     clat (msec): min=2, max=3833, avg=85.61, stdev=285.62
  9.      lat (msec): min=2, max=3833, avg=85.61, stdev=285.62
  10.     clat percentiles (msec):
  11.      |  1.00th=[    4],  5.00th=[    7], 10.00th=[    9], 20.00th=[   11],
  12.      | 30.00th=[   13], 40.00th=[   14], 50.00th=[   16], 60.00th=[   17],
  13.      | 70.00th=[   18], 80.00th=[   23], 90.00th=[  225], 95.00th=[  449],
  14.      | 99.00th=[ 1549], 99.50th=[ 2376], 99.90th=[ 3392], 99.95th=[ 3458],
  15.      | 99.99th=[ 3818]
  16.     bw (KB  /s): min=    4, max= 1391, per=4.80%, avg=268.78, stdev=297.15
  17.     lat (msec) : 4=1.16%, 10=13.87%, 20=64.16%, 50=5.11%, 100=3.73%
  18.     lat (msec) : 250=2.53%, 500=5.15%, 750=1.98%, 1000=0.84%, 2000=0.86%
  19.     lat (msec) : >=2000=0.61%
  20.   cpu          : usr=0.01%, sys=0.07%, ctx=35971, majf=0, minf=0
  21.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  22.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  24.      issued    : total=r=0/w=35150/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  25.      latency   : target=0, window=0, percentile=100.00%, depth=1
  27. Run status group 0 (all jobs):
  28.   WRITE: io=562400KB, aggrb=5605KB/s, minb=5605KB/s, maxb=5605KB/s, mint=100324msec, maxt=100324msec

Random read

fio -filename=/mnt/cephfs/test1G -direct=1 -iodepth 1 -thread -rw=randread -ioengine=psync -bs=16k -size=1G -numjobs=30 -runtime=100 -group_reporting -name=mytest

  1. mytest: (g=0): rw=randread, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [r(30)] [100.0% done] [925.1MB/0KB/0KB /s] [59.3K/0/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=19765: Tue Feb 28 21:07:21 2017
  7.   read : io=30720MB, bw=942851KB/s, iops=58928, runt= 33364msec
  8.     clat (usec): min=117, max=7882, avg=506.27, stdev=218.59
  9.      lat (usec): min=117, max=7882, avg=506.43, stdev=218.59
  10.     clat percentiles (usec):
  11.      |  1.00th=[  233],  5.00th=[  270], 10.00th=[  294], 20.00th=[  330],
  12.      | 30.00th=[  370], 40.00th=[  410], 50.00th=[  454], 60.00th=[  510],
  13.      | 70.00th=[  580], 80.00th=[  668], 90.00th=[  796], 95.00th=[  900],
  14.      | 99.00th=[ 1128], 99.50th=[ 1240], 99.90th=[ 1720], 99.95th=[ 2576],
  15.      | 99.99th=[ 4512]
  16.     bw (KB  /s): min=20736, max=33664, per=3.34%, avg=31456.97, stdev=1321.52
  17.     lat (usec) : 250=2.38%, 500=56.03%, 750=28.82%, 1000=10.33%
  18.     lat (msec) : 2=2.38%, 4=0.06%, 10=0.02%
  19.   cpu          : usr=0.64%, sys=8.53%, ctx=2057478, majf=0, minf=743
  20.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  21.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  22.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      issued    : total=r=1966080/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  24.      latency   : target=0, window=0, percentile=100.00%, depth=1
  26. Run status group 0 (all jobs):
  27.    READ: io=30720MB, aggrb=942850KB/s, minb=942850KB/s, maxb=942850KB/s, mint=33364msec, maxt=33364msec

Random write

fio -filename=/mnt/cephfs/test10G -direct=1 -iodepth 1 -thread -rw=randwrite -ioengine=psync -bs=16k -size=10G -numjobs=30 -runtime=1000 -group_reporting -name=mytest

  1. mytest: (g=0): rw=randwrite, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [w(30)] [100.0% done] [0KB/20048KB/0KB /s] [0/1253/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=21615: Tue Feb 28 21:10:13 2017
  7.   write: io=1107.4MB, bw=11337KB/s, iops=708, runt=100017msec
  8.     clat (msec): min=2, max=1616, avg=42.33, stdev=105.53
  9.      lat (msec): min=2, max=1616, avg=42.33, stdev=105.53
  10.     clat percentiles (msec):
  11.      |  1.00th=[    4],  5.00th=[    7], 10.00th=[    9], 20.00th=[   11],
  12.      | 30.00th=[   13], 40.00th=[   15], 50.00th=[   16], 60.00th=[   18],
  13.      | 70.00th=[   19], 80.00th=[   51], 90.00th=[   73], 95.00th=[   93],
  14.      | 99.00th=[  660], 99.50th=[  832], 99.90th=[ 1123], 99.95th=[ 1205],
  15.      | 99.99th=[ 1450]
  16.     bw (KB  /s): min=    9, max= 1454, per=3.82%, avg=433.00, stdev=302.44
  17.     lat (msec) : 4=1.34%, 10=13.67%, 20=55.78%, 50=8.79%, 100=15.88%
  18.     lat (msec) : 250=1.66%, 500=1.46%, 750=0.69%, 1000=0.45%, 2000=0.27%
  19.   cpu          : usr=0.03%, sys=0.15%, ctx=72260, majf=0, minf=0
  20.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  21.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  22.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      issued    : total=r=0/w=70867/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  24.      latency   : target=0, window=0, percentile=100.00%, depth=1
  26. Run status group 0 (all jobs):
  27.   WRITE: io=1107.4MB, aggrb=11336KB/s, minb=11336KB/s, maxb=11336KB/s, mint=100017msec, maxt=100017msec

Mixed random read/write

fio -filename=/mnt/cephfs/test1G -direct=1 -iodepth 1 -thread -rw=randrw -rwmixread=70 -ioengine=psync -bs=16k -size=1G -numjobs=30 -runtime=100 -group_reporting -name=mytest -ioscheduler=noop

  1. Jobs: 30 (f=30): [m(30)] [100.0% done] [3584KB/1248KB/0KB /s] [224/78/0 iops] [eta 00m:00s]
  2. mytest: (groupid=0, jobs=30): err= 0: pid=24749: Tue Feb 28 21:14:00 2017
  3.   read : io=1280.5MB, bw=13058KB/s, iops=816, runt=100382msec
  4.     clat (usec): min=217, max=3730.5K, avg=9153.07, stdev=87183.13
  5.      lat (usec): min=217, max=3730.5K, avg=9153.44, stdev=87183.13
  6.     clat percentiles (usec):
  7.      |  1.00th=[  334],  5.00th=[  386], 10.00th=[  414], 20.00th=[  450],
  8.      | 30.00th=[  482], 40.00th=[  506], 50.00th=[  532], 60.00th=[  564],
  9.      | 70.00th=[  604], 80.00th=[  660], 90.00th=[  940], 95.00th=[ 8640],
  10.      | 99.00th=[276480], 99.50th=[552960], 99.90th=[1171456], 99.95th=[1744896],
  11.      | 99.99th=[2637824]
  12.     bw (KB  /s): min=    4, max= 3904, per=4.78%, avg=623.82, stdev=719.00
  13.   write: io=544336KB, bw=5422.7KB/s, iops=338, runt=100382msec
  14.     clat (msec): min=2, max=4467, avg=66.20, stdev=233.34
  15.      lat (msec): min=2, max=4467, avg=66.20, stdev=233.34
  16.     clat percentiles (msec):
  17.      |  1.00th=[    4],  5.00th=[    7], 10.00th=[    9], 20.00th=[   11],
  18.      | 30.00th=[   12], 40.00th=[   14], 50.00th=[   15], 60.00th=[   16],
  19.      | 70.00th=[   17], 80.00th=[   19], 90.00th=[   73], 95.00th=[  363],
  20.      | 99.00th=[ 1004], 99.50th=[ 1647], 99.90th=[ 3359], 99.95th=[ 3687],
  21.      | 99.99th=[ 3752]
  22.     bw (KB  /s): min=    3, max= 1088, per=4.72%, avg=256.14, stdev=283.44
  23.     lat (usec) : 250=0.02%, 500=26.16%, 750=34.67%, 1000=3.08%
  24.     lat (msec) : 2=1.23%, 4=1.01%, 10=6.08%, 20=20.68%, 50=2.23%
  25.     lat (msec) : 100=1.39%, 250=0.65%, 500=1.37%, 750=0.70%, 1000=0.34%
  26.     lat (msec) : 2000=0.27%, >=2000=0.13%
  27.   cpu          : usr=0.04%, sys=0.20%, ctx=117635, majf=0, minf=0
  28.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  29.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  30.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  31.      issued    : total=r=81923/w=34021/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  32.      latency   : target=0, window=0, percentile=100.00%, depth=1
  34. Run status group 0 (all jobs):
  35.    READ: io=1280.5MB, aggrb=13057KB/s, minb=13057KB/s, maxb=13057KB/s, mint=100382msec, maxt=100382msec
  36.   WRITE: io=544336KB, aggrb=5422KB/s, minb=5422KB/s, maxb=5422KB/s, mint=100382msec, maxt=100382msec

1Gbps network

Seq read

fio -filename=/mnt/cephfs/test1G -direct=1 -iodepth 1 -thread -rw=read -ioengine=psync -bs=16k -size=1G -numjobs=30 -runtime=100 -group_reporting -name=mytest

  1. mytest: (g=0): rw=read, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [R(30)] [100.0% done] [110.3MB/0KB/0KB /s] [7053/0/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=24327: Tue Feb 28 22:21:03 2017
  7.   read : io=10969MB, bw=112316KB/s, iops=7019, runt=100005msec
  8.     clat (usec): min=970, max=29385, avg=4269.03, stdev=471.08
  9.      lat (usec): min=971, max=29386, avg=4269.45, stdev=471.08
  10.     clat percentiles (usec):
  11.      |  1.00th=[ 3888],  5.00th=[ 4128], 10.00th=[ 4192], 20.00th=[ 4256],
  12.      | 30.00th=[ 4256], 40.00th=[ 4256], 50.00th=[ 4256], 60.00th=[ 4256],
  13.      | 70.00th=[ 4256], 80.00th=[ 4256], 90.00th=[ 4320], 95.00th=[ 4320],
  14.      | 99.00th=[ 4896], 99.50th=[ 5920], 99.90th=[ 9664], 99.95th=[16320],
  15.      | 99.99th=[19072]
  16.     bw (KB  /s): min= 3442, max= 3792, per=3.34%, avg=3747.09, stdev=36.98
  17.     lat (usec) : 1000=0.01%
  18.     lat (msec) : 2=0.06%, 4=1.26%, 10=98.58%, 20=0.08%, 50=0.01%
  19.   cpu          : usr=0.18%, sys=1.38%, ctx=1112420, majf=0, minf=369
  20.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  21.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  22.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      issued    : total=r=702009/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  24.      latency   : target=0, window=0, percentile=100.00%, depth=1
  26. Run status group 0 (all jobs):
  27.    READ: io=10969MB, aggrb=112315KB/s, minb=112315KB/s, maxb=112315KB/s, mint=100005msec, maxt=100005msec

Random read

fio -filename=/mnt/cephfs/test1G -direct=1 -iodepth 1 -thread -rw=randread -ioengine=psync -bs=16k -size=1G -numjobs=30 -runtime=100 -group_reporting -name=mytest

  1. mytest: (g=0): rw=randread, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [r(30)] [100.0% done] [109.1MB/0KB/0KB /s] [7034/0/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=26394: Tue Feb 28 22:23:21 2017
  7.   read : io=10964MB, bw=112262KB/s, iops=7016, runt=100005msec
  8.     clat (usec): min=437, max=99272, avg=4270.51, stdev=917.53
  9.      lat (usec): min=437, max=99273, avg=4270.89, stdev=917.53
  10.     clat percentiles (usec):
  11.      |  1.00th=[ 3312],  5.00th=[ 3568], 10.00th=[ 3696], 20.00th=[ 3824],
  12.      | 30.00th=[ 3952], 40.00th=[ 4048], 50.00th=[ 4128], 60.00th=[ 4256],
  13.      | 70.00th=[ 4384], 80.00th=[ 4640], 90.00th=[ 5024], 95.00th=[ 5408],
  14.      | 99.00th=[ 6112], 99.50th=[ 6368], 99.90th=[13376], 99.95th=[16320],
  15.      | 99.99th=[22144]
  16.     bw (KB  /s): min= 2900, max= 4175, per=3.34%, avg=3745.39, stdev=75.44
  17.     lat (usec) : 500=0.01%, 750=0.06%, 1000=0.05%
  18.     lat (msec) : 2=0.18%, 4=35.94%, 10=63.61%, 20=0.14%, 50=0.01%
  19.     lat (msec) : 100=0.01%
  20.   cpu          : usr=0.18%, sys=1.21%, ctx=1081970, majf=0, minf=429
  21.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  22.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  24.      issued    : total=r=701672/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  25.      latency   : target=0, window=0, percentile=100.00%, depth=1
  27. Run status group 0 (all jobs):
  28.    READ: io=10964MB, aggrb=112261KB/s, minb=112261KB/s, maxb=112261KB/s, mint=100005msec, maxt=100005msec

Seq write

fio -filename=/mnt/cephfs/test1G -direct=1 -iodepth 1 -thread -rw=write -ioengine=psync -bs=16k -size=1G -numjobs=30 -runtime=100 -group_reporting -name=mytest

  1. mytest: (g=0): rw=write, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [W(30)] [100.0% done] [0KB/15936KB/0KB /s] [0/996/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=37072: Tue Feb 28 22:34:43 2017
  7.   write: io=1767.5MB, bw=18075KB/s, iops=1129, runt=100132msec
  8.     clat (msec): min=8, max=418, avg=26.55, stdev=32.17
  9.      lat (msec): min=8, max=418, avg=26.55, stdev=32.17
  10.     clat percentiles (msec):
  11.      |  1.00th=[   17],  5.00th=[   19], 10.00th=[   20], 20.00th=[   20],
  12.      | 30.00th=[   20], 40.00th=[   20], 50.00th=[   20], 60.00th=[   20],
  13.      | 70.00th=[   20], 80.00th=[   21], 90.00th=[   36], 95.00th=[   59],
  14.      | 99.00th=[  262], 99.50th=[  293], 99.90th=[  347], 99.95th=[  359],
  15.      | 99.99th=[  420]
  16.     bw (KB  /s): min=  215, max=  809, per=3.38%, avg=611.73, stdev=143.52
  17.     lat (msec) : 10=0.01%, 20=79.81%, 50=13.16%, 100=5.38%, 250=0.56%
  18.     lat (msec) : 500=1.09%
  19.   cpu          : usr=0.03%, sys=0.27%, ctx=114792, majf=0, minf=0
  20.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  21.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  22.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      issued    : total=r=0/w=113117/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  24.      latency   : target=0, window=0, percentile=100.00%, depth=1
  26. Run status group 0 (all jobs):
  27.   WRITE: io=1767.5MB, aggrb=18074KB/s, minb=18074KB/s, maxb=18074KB/s, mint=100132msec, maxt=100132msec

Random write

fio -filename=/mnt/cephfs/test1G -direct=1 -iodepth 1 -thread -rw=randwrite -ioengine=psync -bs=16k -size=1G -numjobs=30 -runtime=1000 -group_reporting -name=mytest

  1. mytest: (g=0): rw=randwrite, bs=16K-16K/16K-16K/16K-16K, ioengine=psync, iodepth=1
  2. ...
  3. fio-2.2.10
  4. Starting 30 threads
  5. Jobs: 30 (f=30): [w(30)] [100.0% done] [0KB/176KB/0KB /s] [0/11/0 iops] [eta 00m:00s]
  6. mytest: (groupid=0, jobs=30): err= 0: pid=40653: Tue Feb 28 22:38:30 2017
  7.   write: io=554000KB, bw=5496.4KB/s, iops=343, runt=100800msec
  8.     clat (msec): min=2, max=4549, avg=87.31, stdev=293.30
  9.      lat (msec): min=2, max=4549, avg=87.31, stdev=293.30
  10.     clat percentiles (msec):
  11.      |  1.00th=[    5],  5.00th=[    8], 10.00th=[    9], 20.00th=[   12],
  12.      | 30.00th=[   13], 40.00th=[   15], 50.00th=[   16], 60.00th=[   17],
  13.      | 70.00th=[   18], 80.00th=[   22], 90.00th=[  163], 95.00th=[  490],
  14.      | 99.00th=[ 1631], 99.50th=[ 2147], 99.90th=[ 2966], 99.95th=[ 4359],
  15.      | 99.99th=[ 4555]
  16.     bw (KB  /s): min=    3, max= 1372, per=4.96%, avg=272.85, stdev=326.87
  17.     lat (msec) : 4=1.00%, 10=12.28%, 20=66.17%, 50=5.79%, 100=3.79%
  18.     lat (msec) : 250=2.02%, 500=4.08%, 750=2.36%, 1000=0.74%, 2000=1.19%
  19.     lat (msec) : >=2000=0.59%
  20.   cpu          : usr=0.01%, sys=0.07%, ctx=35067, majf=0, minf=0
  21.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  22.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  23.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  24.      issued    : total=r=0/w=34625/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  25.      latency   : target=0, window=0, percentile=100.00%, depth=1
  27. Run status group 0 (all jobs):
  28.   WRITE: io=554000KB, aggrb=5496KB/s, minb=5496KB/s, maxb=5496KB/s, mint=100800msec, maxt=100800msec
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