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Random Reads – SYNC mode

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Mar 16th, 2020
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  1. 4K block size100% Reads
  2. fio --name=randread --rw=randread --direct=0 --ioengine=sync --bs=4k --numjobs=1 --size=1G --runtime=600
  3.  
  4. randread: (groupid=0, jobs=1): err= 0: pid=3564: Mon Mar 16 07:59:01 2020
  5.   read : io=1024.0MB, bw=186149KB/s, iops=46537, runt=  5633msec
  6.     clat (usec): min=2, max=311, avg=20.25, stdev= 8.21
  7.      lat (usec): min=2, max=311, avg=20.45, stdev= 8.21
  8.     clat percentiles (usec):
  9.      |  1.00th=[    2],  5.00th=[    3], 10.00th=[    4], 20.00th=[   19],
  10.      | 30.00th=[   21], 40.00th=[   22], 50.00th=[   23], 60.00th=[   24],
  11.      | 70.00th=[   24], 80.00th=[   25], 90.00th=[   27], 95.00th=[   28],
  12.      | 99.00th=[   31], 99.50th=[   36], 99.90th=[   43], 99.95th=[   46],
  13.      | 99.99th=[   66]
  14.     lat (usec) : 4=6.35%, 10=11.84%, 20=2.04%, 50=79.75%, 100=0.03%
  15.     lat (usec) : 250=0.01%, 500=0.01%
  16.   cpu          : usr=4.10%, sys=95.83%, ctx=16, majf=0, minf=18
  17.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  18.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  19.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  20.      issued    : total=r=262144/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  21.      latency   : target=0, window=0, percentile=100.00%, depth=1
  22.  
  23. Run status group 0 (all jobs):
  24.    READ: io=1024.0MB, aggrb=186148KB/s, minb=186148KB/s, maxb=186148KB/s, mint=5633msec, maxt=5633msec
  25.  
  26. ----------------------------------------------------------------------------------------------------
  27.  
  28. 8K block size100% Reads
  29. fio --name=randread --rw=randread --direct=0 --ioengine=sync --bs=8k --numjobs=1 --size=1G --runtime=600
  30.  
  31. randread: (groupid=0, jobs=1): err= 0: pid=12394: Mon Mar 16 08:03:06 2020
  32.   read : io=1024.0MB, bw=403143KB/s, iops=50392, runt=  2601msec
  33.     clat (usec): min=2, max=177, avg=18.70, stdev= 8.32
  34.      lat (usec): min=2, max=177, avg=18.89, stdev= 8.32
  35.     clat percentiles (usec):
  36.      |  1.00th=[    2],  5.00th=[    3], 10.00th=[    4], 20.00th=[    5],
  37.      | 30.00th=[   20], 40.00th=[   21], 50.00th=[   22], 60.00th=[   23],
  38.      | 70.00th=[   23], 80.00th=[   24], 90.00th=[   25], 95.00th=[   27],
  39.      | 99.00th=[   29], 99.50th=[   33], 99.90th=[   42], 99.95th=[   44],
  40.      | 99.99th=[   63]
  41.     lat (usec) : 4=8.16%, 10=13.53%, 20=5.06%, 50=73.22%, 100=0.04%
  42.     lat (usec) : 250=0.01%
  43.   cpu          : usr=3.65%, sys=96.31%, ctx=4, majf=0, minf=17
  44.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  45.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  46.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  47.      issued    : total=r=131072/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  48.      latency   : target=0, window=0, percentile=100.00%, depth=1
  49.  
  50. Run status group 0 (all jobs):
  51.    READ: io=1024.0MB, aggrb=403143KB/s, minb=403143KB/s, maxb=403143KB/s, mint=2601msec, maxt=2601msec
  52.  
  53. ----------------------------------------------------------------------------------------------------
  54.  
  55. 16K block size100% Reads
  56. fio --name=randread --rw=randread --direct=0 --ioengine=sync --bs=16k --numjobs=1 --size=1G --runtime=600
  57.  
  58. randread: (groupid=0, jobs=1): err= 0: pid=13079: Mon Mar 16 08:03:25 2020
  59.   read : io=1024.0MB, bw=887120KB/s, iops=55445, runt=  1182msec
  60.     clat (usec): min=2, max=207, avg=16.83, stdev= 7.52
  61.      lat (usec): min=2, max=207, avg=17.02, stdev= 7.52
  62.     clat percentiles (usec):
  63.      |  1.00th=[    3],  5.00th=[    3], 10.00th=[    4], 20.00th=[    5],
  64.      | 30.00th=[   19], 40.00th=[   20], 50.00th=[   20], 60.00th=[   21],
  65.      | 70.00th=[   21], 80.00th=[   22], 90.00th=[   22], 95.00th=[   23],
  66.      | 99.00th=[   26], 99.50th=[   29], 99.90th=[   37], 99.95th=[   47],
  67.      | 99.99th=[   71]
  68.     lat (usec) : 4=5.65%, 10=18.78%, 20=12.62%, 50=62.92%, 100=0.04%
  69.     lat (usec) : 250=0.01%
  70.   cpu          : usr=4.66%, sys=95.09%, ctx=4, majf=0, minf=15
  71.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  72.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  73.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  74.      issued    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  75.      latency   : target=0, window=0, percentile=100.00%, depth=1
  76.  
  77. Run status group 0 (all jobs):
  78.    READ: io=1024.0MB, aggrb=887120KB/s, minb=887120KB/s, maxb=887120KB/s, mint=1182msec, maxt=1182msec
  79.  
  80. ----------------------------------------------------------------------------------------------------
  81.  
  82. 32K block size100% Reads
  83. fio --name=randread --rw=randread --direct=0 --ioengine=sync --bs=32k --numjobs=1 --size=1G --runtime=600
  84.  
  85. randread: (groupid=0, jobs=1): err= 0: pid=13505: Mon Mar 16 08:03:39 2020
  86.   read : io=1024.0MB, bw=1521.6MB/s, iops=48689, runt=   673msec
  87.     clat (usec): min=2, max=83, avg=19.39, stdev= 7.84
  88.      lat (usec): min=2, max=83, avg=19.58, stdev= 7.84
  89.     clat percentiles (usec):
  90.      |  1.00th=[    3],  5.00th=[    5], 10.00th=[    6], 20.00th=[    7],
  91.      | 30.00th=[   21], 40.00th=[   22], 50.00th=[   22], 60.00th=[   23],
  92.      | 70.00th=[   24], 80.00th=[   25], 90.00th=[   26], 95.00th=[   27],
  93.      | 99.00th=[   30], 99.50th=[   35], 99.90th=[   44], 99.95th=[   51],
  94.      | 99.99th=[   75]
  95.     lat (usec) : 4=3.85%, 10=18.30%, 20=2.96%, 50=74.84%, 100=0.05%
  96.   cpu          : usr=4.61%, sys=94.79%, ctx=1, majf=0, minf=13
  97.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  98.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  99.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  100.      issued    : total=r=32768/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  101.      latency   : target=0, window=0, percentile=100.00%, depth=1
  102.  
  103. Run status group 0 (all jobs):
  104.    READ: io=1024.0MB, aggrb=1521.6MB/s, minb=1521.6MB/s, maxb=1521.6MB/s, mint=673msec, maxt=673msec
  105.  
  106. ----------------------------------------------------------------------------------------------------
  107.  
  108. 64K block size100% Reads
  109. fio --name=randread --rw=randread --direct=0 --ioengine=sync --bs=64k --numjobs=1 --size=1G --runtime=600
  110.  
  111. randread: (groupid=0, jobs=1): err= 0: pid=13823: Mon Mar 16 08:03:51 2020
  112.   read : io=1024.0MB, bw=3020.7MB/s, iops=48330, runt=   339msec
  113.     clat (usec): min=3, max=76, avg=19.54, stdev= 5.65
  114.      lat (usec): min=3, max=76, avg=19.73, stdev= 5.66
  115.     clat percentiles (usec):
  116.      |  1.00th=[    4],  5.00th=[    7], 10.00th=[    8], 20.00th=[   19],
  117.      | 30.00th=[   20], 40.00th=[   20], 50.00th=[   21], 60.00th=[   21],
  118.      | 70.00th=[   22], 80.00th=[   23], 90.00th=[   24], 95.00th=[   25],
  119.      | 99.00th=[   27], 99.50th=[   31], 99.90th=[   47], 99.95th=[   50],
  120.      | 99.99th=[   68]
  121.     lat (usec) : 4=0.21%, 10=13.80%, 20=9.41%, 50=76.53%, 100=0.05%
  122.   cpu          : usr=4.44%, sys=95.27%, ctx=1, majf=0, minf=21
  123.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  124.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  125.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  126.      issued    : total=r=16384/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  127.      latency   : target=0, window=0, percentile=100.00%, depth=1
  128.  
  129. Run status group 0 (all jobs):
  130.    READ: io=1024.0MB, aggrb=3020.7MB/s, minb=3020.7MB/s, maxb=3020.7MB/s, mint=339msec, maxt=339msec
  131.  
  132. ----------------------------------------------------------------------------------------------------
  133.  
  134. 128K block size100% Reads
  135. fio --name=randread --rw=randread --direct=0 --ioengine=sync --bs=128k --numjobs=1 --size=1G --runtime=600
  136.  
  137. randread: (groupid=0, jobs=1): err= 0: pid=14299: Mon Mar 16 08:04:04 2020
  138.   read : io=1024.0MB, bw=4697.3MB/s, iops=37577, runt=   218msec
  139.     clat (usec): min=14, max=74, avg=25.47, stdev= 2.70
  140.      lat (usec): min=14, max=75, avg=25.65, stdev= 2.71
  141.     clat percentiles (usec):
  142.      |  1.00th=[   21],  5.00th=[   22], 10.00th=[   23], 20.00th=[   24],
  143.      | 30.00th=[   24], 40.00th=[   25], 50.00th=[   25], 60.00th=[   26],
  144.      | 70.00th=[   26], 80.00th=[   27], 90.00th=[   28], 95.00th=[   29],
  145.      | 99.00th=[   33], 99.50th=[   40], 99.90th=[   45], 99.95th=[   47],
  146.      | 99.99th=[   74]
  147.     lat (usec) : 20=0.23%, 50=99.73%, 100=0.04%
  148.   cpu          : usr=3.23%, sys=96.31%, ctx=1, majf=0, minf=41
  149.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  150.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  151.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  152.      issued    : total=r=8192/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  153.      latency   : target=0, window=0, percentile=100.00%, depth=1
  154.  
  155. Run status group 0 (all jobs):
  156.    READ: io=1024.0MB, aggrb=4697.3MB/s, minb=4697.3MB/s, maxb=4697.3MB/s, mint=218msec, maxt=218msec
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