IOPSのインストールと測定結果 ([email protected])

XWSS014701-s

[email protected] をしばらく使っている。

IOPS を測定してみようと思ったので実行した。

1秒間に可能なI/O(リード/ライトの処理)の回数をあらわすもの。数値が高いほど処理能力が高いということになる。ハードディスクやストレージ等の性能を示すために使われる単位。データを迅速に取り扱うためにIOPSの向上が注目されている(「IOPS:ビジネス用語辞典 | Wisdom」より引用)

スポンサードリンク

インストール

# yum install libaio-devel
# wget http://pkgs.repoforge.org/fio/fio-2.0.7-1.el5.rf.i386.rpm
# rpm -Uvh fio-2.0.7-1.el5.rf.i386.rpm

必要なモジュールと本体をインストールする。

※インストールするものは「http://pkgs.repoforge.org/fio/」から選択した
※テストに使用した設定ファイルは、参考文献のものをそのまま、または一部変更して使用させてもらった
※ひとつの設定ファイルについて2回実行した

テスト1

設定ファイル

設定ファイルを作成する。

# vi random-read-test.fio

以下の内容を記述する。

; random read 128MB
[random-read]
rw=randread
size=128m
directory=/var/tmp/

テスト実行

テストを実行する。

# fio random-read-test.fio

テスト結果1

実行結果その1。

random-read: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
fio 2.0.7
Starting 1 process
random-read: Laying out IO file(s) (1 file(s) / 128MB)
Jobs: 1 (f=1): [r] [-.-% done] [51285K/0K /s] [12.6K/0  iops] [eta 00m:00s]
random-read: (groupid=0, jobs=1): err= 0: pid=55133
  read : io=131072KB, bw=48907KB/s, iops=12226 , runt=  2680msec
    clat (usec): min=3 , max=50783 , avg=75.54, stdev=391.73
     lat (usec): min=4 , max=50784 , avg=76.21, stdev=391.73
    clat percentiles (usec):
     |  1.00th=[   52],  5.00th=[   54], 10.00th=[   56], 20.00th=[   58],
     | 30.00th=[   60], 40.00th=[   61], 50.00th=[   63], 60.00th=[   64],
     | 70.00th=[   67], 80.00th=[   72], 90.00th=[   97], 95.00th=[  133],
     | 99.00th=[  159], 99.50th=[  195], 99.90th=[  394], 99.95th=[  700],
     | 99.99th=[23680]
    bw (KB/s)  : min=43880, max=52656, per=99.77%, avg=48796.80, stdev=3533.18
    lat (usec) : 4=0.01%, 10=0.01%, 50=0.01%, 100=90.30%, 250=9.50%
    lat (usec) : 500=0.10%, 750=0.02%, 1000=0.02%
    lat (msec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.01%
    lat (msec) : 100=0.01%
  cpu          : usr=5.49%, sys=20.87%, ctx=32758, majf=0, minf=0
  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    : total=r=32768/w=0/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=131072KB, aggrb=48907KB/s, minb=48907KB/s, maxb=48907KB/s, mint=2680msec, maxt=2680msec

テスト結果2

実行結果その2。

random-read: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1
fio 2.0.7
Starting 1 process
Jobs: 1 (f=1): [r] [100.0% done] [3851K/0K /s] [940 /0  iops] [eta 00m:00s]
random-read: (groupid=0, jobs=1): err= 0: pid=30247
  read : io=131072KB, bw=2138.2KB/s, iops=534 , runt= 61303msec
    clat (usec): min=144 , max=510433 , avg=1861.77, stdev=3991.93
     lat (usec): min=144 , max=510434 , avg=1862.57, stdev=3991.93
    clat percentiles (usec):
     |  1.00th=[  169],  5.00th=[  185], 10.00th=[  201], 20.00th=[  239],
     | 30.00th=[  266], 40.00th=[  286], 50.00th=[  322], 60.00th=[  386],
     | 70.00th=[ 2512], 80.00th=[ 4192], 90.00th=[ 5856], 95.00th=[ 6624],
     | 99.00th=[ 7584], 99.50th=[ 7840], 99.90th=[19328], 99.95th=[35072],
     | 99.99th=[54016]
    bw (KB/s)  : min=   15, max= 5960, per=100.00%, avg=2139.97, stdev=899.14
    lat (usec) : 250=22.40%, 500=40.10%, 750=0.69%, 1000=0.23%
    lat (msec) : 2=3.56%, 4=11.96%, 10=20.86%, 20=0.10%, 50=0.08%
    lat (msec) : 100=0.01%, 250=0.01%, 750=0.01%
  cpu          : usr=0.21%, sys=2.03%, ctx=32797, majf=0, minf=0
  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    : total=r=32768/w=0/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=131072KB, aggrb=2138KB/s, minb=2138KB/s, maxb=2138KB/s, mint=61303msec, maxt=61303msec

テスト2

設定ファイル

設定ファイルを作成する。

# vi four-threads-randio.fio

以下の内容を記述する。

; Four threads, two query, two writers.

[global]
rw=randread
size=256m
directory=/var/tmp/
ioengine=libaio
iodepth=4
invalidate=1
direct=1

[bgwriter]
rw=randwrite
iodepth=32

[queryA]
iodepth=1
ioengine=mmap
direct=0
thinktime=3

[queryB]
iodepth=1
ioengine=mmap
direct=0
thinktime=5

[bgupdater]
rw=randrw
iodepth=16
thinktime=40
size=32m

テスト結果1

テスト結果その1。

bgwriter: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=32
queryA: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=mmap, iodepth=1
queryB: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=mmap, iodepth=1
bgupdater: (g=0): rw=randrw, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=16
fio 2.0.7
Starting 4 processes
bgwriter: Laying out IO file(s) (1 file(s) / 256MB)
queryA: Laying out IO file(s) (1 file(s) / 256MB)
queryB: Laying out IO file(s) (1 file(s) / 256MB)
bgupdater: Laying out IO file(s) (1 file(s) / 32MB)
Jobs: 1 (f=1): [_r__] [100.0% done] [1782K/0K /s] [435 /0  iops] [eta 00m:00s]
bgwriter: (groupid=0, jobs=1): err= 0: pid=9992
  write: io=262144KB, bw=27384KB/s, iops=6845 , runt=  9573msec
    slat (usec): min=78 , max=120592 , avg=137.55, stdev=585.36
    clat (usec): min=183 , max=205439 , avg=4517.46, stdev=5218.60
     lat (usec): min=517 , max=205593 , avg=4656.84, stdev=5327.42
    clat percentiles (msec):
     |  1.00th=[    4],  5.00th=[    4], 10.00th=[    4], 20.00th=[    4],
     | 30.00th=[    4], 40.00th=[    4], 50.00th=[    5], 60.00th=[    5],
     | 70.00th=[    5], 80.00th=[    5], 90.00th=[    6], 95.00th=[    6],
     | 99.00th=[    8], 99.50th=[   27], 99.90th=[   77], 99.95th=[   87],
     | 99.99th=[  202]
    bw (KB/s)  : min=17688, max=30800, per=94.17%, avg=27382.74, stdev=4109.38
    lat (usec) : 250=0.01%, 750=0.01%, 1000=0.01%
    lat (msec) : 2=0.01%, 4=47.04%, 10=52.15%, 20=0.24%, 50=0.28%
    lat (msec) : 100=0.23%, 250=0.05%
  cpu          : usr=4.65%, sys=36.89%, ctx=65637, majf=0, minf=0
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=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=0.1%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=0/d=65536, short=r=0/w=0/d=0
queryA: (groupid=0, jobs=1): err= 0: pid=9993
  read : io=262144KB, bw=832590 B/s, iops=203 , runt=322410msec
    clat (usec): min=84 , max=683624 , avg=4244.76, stdev=6520.44
     lat (usec): min=84 , max=683625 , avg=4245.63, stdev=6520.45
    clat percentiles (usec):
     |  1.00th=[  223],  5.00th=[  294], 10.00th=[  354], 20.00th=[ 1576],
     | 30.00th=[ 2416], 40.00th=[ 3184], 50.00th=[ 3984], 60.00th=[ 4768],
     | 70.00th=[ 5536], 80.00th=[ 6240], 90.00th=[ 7008], 95.00th=[ 8512],
     | 99.00th=[12864], 99.50th=[17024], 99.90th=[43776], 99.95th=[66048],
     | 99.99th=[264192]
    bw (KB/s)  : min=   18, max= 1790, per=48.73%, avg=817.21, stdev=137.57
    lat (usec) : 100=0.01%, 250=2.39%, 500=12.02%, 750=0.85%, 1000=0.47%
    lat (msec) : 2=9.22%, 4=25.41%, 10=46.19%, 20=3.09%, 50=0.28%
    lat (msec) : 100=0.04%, 250=0.02%, 500=0.01%, 750=0.01%
  cpu          : usr=0.08%, sys=0.60%, ctx=131188, majf=0, minf=65536
  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    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
queryB: (groupid=0, jobs=1): err= 0: pid=9994
  read : io=262144KB, bw=842383 B/s, iops=205 , runt=318662msec
    clat (usec): min=70 , max=605185 , avg=4186.57, stdev=6388.82
     lat (usec): min=71 , max=605186 , avg=4187.44, stdev=6388.81
    clat percentiles (usec):
     |  1.00th=[  221],  5.00th=[  298], 10.00th=[  366], 20.00th=[ 1512],
     | 30.00th=[ 2320], 40.00th=[ 3120], 50.00th=[ 3920], 60.00th=[ 4640],
     | 70.00th=[ 5408], 80.00th=[ 6112], 90.00th=[ 6944], 95.00th=[ 8640],
     | 99.00th=[12736], 99.50th=[16768], 99.90th=[44800], 99.95th=[72192],
     | 99.99th=[321536]
    bw (KB/s)  : min=   16, max= 1672, per=49.30%, avg=826.73, stdev=129.31
    lat (usec) : 100=0.07%, 250=2.35%, 500=11.52%, 750=0.67%, 1000=0.80%
    lat (msec) : 2=10.54%, 4=25.20%, 10=45.30%, 20=3.24%, 50=0.24%
    lat (msec) : 100=0.05%, 250=0.02%, 500=0.01%, 750=0.01%
  cpu          : usr=0.08%, sys=0.57%, ctx=131111, majf=0, minf=65536
  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    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
bgupdater: (groupid=0, jobs=1): err= 0: pid=9995
  read : io=16552KB, bw=2017.7KB/s, iops=504 , runt=  8206msec
    slat (usec): min=7 , max=197 , avg=32.26, stdev=20.69
    clat (msec): min=2 , max=40 , avg=15.06, stdev= 1.22
     lat (msec): min=2 , max=40 , avg=15.09, stdev= 1.22
    clat percentiles (usec):
     |  1.00th=[12992],  5.00th=[14144], 10.00th=[14912], 20.00th=[14912],
     | 30.00th=[14912], 40.00th=[15040], 50.00th=[15040], 60.00th=[15040],
     | 70.00th=[15040], 80.00th=[15040], 90.00th=[15168], 95.00th=[15168],
     | 99.00th=[18816], 99.50th=[22912], 99.90th=[31104], 99.95th=[31360],
     | 99.99th=[40192]
    bw (KB/s)  : min= 1944, max= 2168, per=100.00%, avg=2012.00, stdev=71.48
  write: io=16216KB, bw=1976.2KB/s, iops=494 , runt=  8206msec
    slat (usec): min=8 , max=231 , avg=35.32, stdev=21.92
    clat (msec): min=3 , max=57 , avg=15.00, stdev= 1.31
     lat (msec): min=3 , max=57 , avg=15.04, stdev= 1.31
    clat percentiles (usec):
     |  1.00th=[12864],  5.00th=[14016], 10.00th=[14784], 20.00th=[14912],
     | 30.00th=[14912], 40.00th=[15040], 50.00th=[15040], 60.00th=[15040],
     | 70.00th=[15040], 80.00th=[15040], 90.00th=[15168], 95.00th=[15168],
     | 99.00th=[18048], 99.50th=[21376], 99.90th=[28032], 99.95th=[39680],
     | 99.99th=[57088]
    bw (KB/s)  : min= 1840, max= 2064, per=6.81%, avg=1978.94, stdev=76.27
    lat (msec) : 4=0.02%, 10=0.24%, 20=99.06%, 50=0.66%, 100=0.01%
  cpu          : usr=0.05%, sys=0.12%, ctx=8188, majf=0, minf=0
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=99.8%, 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=0.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=4138/w=0/d=4054, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=540840KB, aggrb=1677KB/s, minb=813KB/s, maxb=2017KB/s, mint=8206msec, maxt=322410msec
  WRITE: io=278360KB, aggrb=29077KB/s, minb=1976KB/s, maxb=27383KB/s, mint=8206msec, maxt=9573msec

テスト結果2

テスト結果その2。

bgwriter: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=32
queryA: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=mmap, iodepth=1
queryB: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=mmap, iodepth=1
bgupdater: (g=0): rw=randrw, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=16
fio 2.0.7
Starting 4 processes
Jobs: 1 (f=1): [_r__] [99.7% done] [1535K/0K /s] [374 /0  iops] [eta 00m:01s]
bgwriter: (groupid=0, jobs=1): err= 0: pid=52645
  write: io=262144KB, bw=129774KB/s, iops=32443 , runt=  2020msec
    slat (usec): min=6 , max=195 , avg=10.60, stdev= 7.84
    clat (usec): min=184 , max=202973 , avg=971.64, stdev=7273.63
     lat (usec): min=202 , max=202982 , avg=983.05, stdev=7273.56
    clat percentiles (usec):
     |  1.00th=[  366],  5.00th=[  402], 10.00th=[  422], 20.00th=[  458],
     | 30.00th=[  502], 40.00th=[  548], 50.00th=[  596], 60.00th=[  644],
     | 70.00th=[  708], 80.00th=[  804], 90.00th=[  956], 95.00th=[ 1112],
     | 99.00th=[ 2040], 99.50th=[ 3760], 99.90th=[166912], 99.95th=[193536],
     | 99.99th=[203776]
    bw (KB/s)  : min=94344, max=181656, per=100.00%, avg=139541.00, stdev=43737.52
    lat (usec) : 250=0.10%, 500=29.24%, 750=44.98%, 1000=17.57%
    lat (msec) : 2=7.06%, 4=0.67%, 10=0.14%, 20=0.05%, 100=0.05%
    lat (msec) : 250=0.15%
  cpu          : usr=15.11%, sys=34.22%, ctx=2008, majf=0, minf=0
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=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=0.1%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=0/d=65536, short=r=0/w=0/d=0
queryA: (groupid=0, jobs=1): err= 0: pid=52646
  read : io=262144KB, bw=813044 B/s, iops=198 , runt=330161msec
    clat (usec): min=168 , max=925151 , avg=4355.63, stdev=7198.45
     lat (usec): min=168 , max=925152 , avg=4356.50, stdev=7198.46
    clat percentiles (usec):
     |  1.00th=[  227],  5.00th=[  298], 10.00th=[  362], 20.00th=[ 1672],
     | 30.00th=[ 2512], 40.00th=[ 3280], 50.00th=[ 4016], 60.00th=[ 4832],
     | 70.00th=[ 5536], 80.00th=[ 6304], 90.00th=[ 7008], 95.00th=[ 8640],
     | 99.00th=[12864], 99.50th=[17024], 99.90th=[60672], 99.95th=[102912],
     | 99.99th=[280576]
    bw (KB/s)  : min=   23, max= 1648, per=48.71%, avg=797.31, stdev=157.72
    lat (usec) : 250=2.07%, 500=11.50%, 750=0.71%, 1000=0.48%
    lat (msec) : 2=9.25%, 4=25.40%, 10=47.06%, 20=3.15%, 50=0.25%
    lat (msec) : 100=0.07%, 250=0.05%, 500=0.01%, 750=0.01%, 1000=0.01%
  cpu          : usr=0.08%, sys=0.62%, ctx=131129, majf=0, minf=65536
  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    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
queryB: (groupid=0, jobs=1): err= 0: pid=52649
  read : io=262144KB, bw=822878 B/s, iops=200 , runt=326215msec
    clat (usec): min=166 , max=553356 , avg=4294.24, stdev=6698.79
     lat (usec): min=167 , max=553357 , avg=4295.10, stdev=6698.79
    clat percentiles (usec):
     |  1.00th=[  229],  5.00th=[  302], 10.00th=[  370], 20.00th=[ 1576],
     | 30.00th=[ 2416], 40.00th=[ 3184], 50.00th=[ 3952], 60.00th=[ 4704],
     | 70.00th=[ 5472], 80.00th=[ 6176], 90.00th=[ 6944], 95.00th=[ 8768],
     | 99.00th=[12864], 99.50th=[17280], 99.90th=[63744], 99.95th=[129536],
     | 99.99th=[337920]
    bw (KB/s)  : min=    7, max= 1508, per=49.24%, avg=806.02, stdev=157.21
    lat (usec) : 250=2.00%, 500=11.26%, 750=0.71%, 1000=0.81%
    lat (msec) : 2=10.48%, 4=25.47%, 10=45.64%, 20=3.23%, 50=0.25%
    lat (msec) : 100=0.06%, 250=0.05%, 500=0.01%, 750=0.01%
  cpu          : usr=0.09%, sys=0.59%, ctx=131140, majf=0, minf=65536
  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    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0
bgupdater: (groupid=0, jobs=1): err= 0: pid=52650
  read : io=16504KB, bw=1648.1KB/s, iops=412 , runt= 10014msec
    slat (usec): min=7 , max=166 , avg=29.22, stdev= 7.56
    clat (msec): min=2 , max=773 , avg=20.14, stdev=40.67
     lat (msec): min=2 , max=773 , avg=20.17, stdev=40.67
    clat percentiles (msec):
     |  1.00th=[   11],  5.00th=[   13], 10.00th=[   14], 20.00th=[   15],
     | 30.00th=[   15], 40.00th=[   15], 50.00th=[   16], 60.00th=[   16],
     | 70.00th=[   16], 80.00th=[   18], 90.00th=[   21], 95.00th=[   24],
     | 99.00th=[  161], 99.50th=[  306], 99.90th=[  676], 99.95th=[  685],
     | 99.99th=[  775]
    bw (KB/s)  : min=  115, max= 2192, per=100.00%, avg=1642.42, stdev=744.38
  write: io=16264KB, bw=1624.2KB/s, iops=406 , runt= 10014msec
    slat (usec): min=8 , max=203 , avg=30.47, stdev= 7.54
    clat (usec): min=882 , max=767075 , avg=16967.23, stdev=36608.21
     lat (usec): min=922 , max=767100 , avg=16998.86, stdev=36607.64
    clat percentiles (msec):
     |  1.00th=[    6],  5.00th=[   12], 10.00th=[   13], 20.00th=[   14],
     | 30.00th=[   15], 40.00th=[   15], 50.00th=[   15], 60.00th=[   15],
     | 70.00th=[   16], 80.00th=[   16], 90.00th=[   16], 95.00th=[   16],
     | 99.00th=[   59], 99.50th=[  176], 99.90th=[  668], 99.95th=[  750],
     | 99.99th=[  766]
    bw (KB/s)  : min=   74, max= 2144, per=5.86%, avg=1629.84, stdev=731.83
    lat (usec) : 1000=0.02%
    lat (msec) : 2=0.10%, 4=0.24%, 10=1.38%, 20=92.48%, 50=4.21%
    lat (msec) : 100=0.48%, 250=0.56%, 500=0.28%, 750=0.18%, 1000=0.06%
  cpu          : usr=0.00%, sys=0.08%, ctx=8259, majf=0, minf=0
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=99.8%, 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=0.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=4126/w=0/d=4066, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=540792KB, aggrb=1637KB/s, minb=793KB/s, maxb=1648KB/s, mint=10014msec, maxt=330161msec
  WRITE: io=278408KB, aggrb=27801KB/s, minb=1624KB/s, maxb=129774KB/s, mint=2020msec, maxt=10014msec

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