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Sequential Reads – SYNC mode

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Mar 16th, 2020
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  1. - 4K block size – 100% Reads
  2. fio --direct=0 --name=seqread --rw=read --ioengine=sync --bs=4k --numjobs=1 --size=1G --runtime=600
  3.  
  4. seqread: (groupid=0, jobs=1): err= 0: pid=9970: Mon Mar 16 07:36:06 2020
  5.   read : io=1024.0MB, bw=1245.8MB/s, iops=318909, runt=   822msec
  6.     clat (usec): min=1, max=85, avg= 2.23, stdev= 3.54
  7.      lat (usec): min=1, max=85, avg= 2.41, stdev= 3.53
  8.     clat percentiles (usec):
  9.      |  1.00th=[    1],  5.00th=[    1], 10.00th=[    1], 20.00th=[    1],
  10.      | 30.00th=[    1], 40.00th=[    2], 50.00th=[    2], 60.00th=[    2],
  11.      | 70.00th=[    2], 80.00th=[    2], 90.00th=[    2], 95.00th=[    2],
  12.      | 99.00th=[   22], 99.50th=[   23], 99.90th=[   25], 99.95th=[   26],
  13.      | 99.99th=[   28]
  14.     lat (usec) : 2=38.77%, 4=58.07%, 10=0.03%, 20=0.17%, 50=2.96%
  15.     lat (usec) : 100=0.01%
  16.   cpu          : usr=18.39%, sys=81.12%, ctx=1, majf=0, minf=8
  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=1245.8MB/s, minb=1245.8MB/s, maxb=1245.8MB/s, mint=822msec, maxt=822msec
  25.  
  26. ------------------------------------------------------------------------------------------------------------------------
  27. - 8K block size – 100% Reads
  28. fio --direct=0 --name=seqread --rw=read --ioengine=sync --bs=8k --numjobs=1 --size=1G --runtime=600
  29.  
  30. seqread: (groupid=0, jobs=1): err= 0: pid=11495: Mon Mar 16 07:37:01 2020
  31.   read : io=1024.0MB, bw=1910.5MB/s, iops=244537, runt=   536msec
  32.     clat (usec): min=1, max=142, avg= 3.18, stdev= 5.64
  33.      lat (usec): min=1, max=142, avg= 3.36, stdev= 5.63
  34.     clat percentiles (usec):
  35.      |  1.00th=[    1],  5.00th=[    1], 10.00th=[    1], 20.00th=[    1],
  36.      | 30.00th=[    2], 40.00th=[    2], 50.00th=[    2], 60.00th=[    2],
  37.      | 70.00th=[    2], 80.00th=[    2], 90.00th=[    2], 95.00th=[   23],
  38.      | 99.00th=[   27], 99.50th=[   28], 99.90th=[   30], 99.95th=[   31],
  39.      | 99.99th=[   41]
  40.     lat (usec) : 2=25.43%, 4=68.26%, 10=0.05%, 20=0.03%, 50=6.22%
  41.     lat (usec) : 100=0.01%, 250=0.01%
  42.   cpu          : usr=12.52%, sys=86.92%, ctx=3, majf=0, minf=8
  43.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  44.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  45.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  46.      issued    : total=r=131072/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  47.      latency   : target=0, window=0, percentile=100.00%, depth=1
  48.  
  49. Run status group 0 (all jobs):
  50.    READ: io=1024.0MB, aggrb=1910.5MB/s, minb=1910.5MB/s, maxb=1910.5MB/s, mint=536msec, maxt=536msec
  51. ------------------------------------------------------------------------------------------------------------------------
  52.  
  53. - 16K block size – 100% Reads
  54. fio --direct=0 --name=seqread --rw=read --ioengine=sync --bs=16k --numjobs=1 --size=1G --runtime=600
  55.  
  56. seqread: (groupid=0, jobs=1): err= 0: pid=11897: Mon Mar 16 07:37:15 2020
  57.   read : io=1024.0MB, bw=2694.8MB/s, iops=172463, runt=   380msec
  58.     clat (usec): min=1, max=95, avg= 4.87, stdev= 7.60
  59.      lat (usec): min=2, max=96, avg= 5.05, stdev= 7.60
  60.     clat percentiles (usec):
  61.      |  1.00th=[    1],  5.00th=[    2], 10.00th=[    2], 20.00th=[    2],
  62.      | 30.00th=[    2], 40.00th=[    2], 50.00th=[    2], 60.00th=[    2],
  63.      | 70.00th=[    2], 80.00th=[    2], 90.00th=[   23], 95.00th=[   25],
  64.      | 99.00th=[   28], 99.50th=[   29], 99.90th=[   32], 99.95th=[   35],
  65.      | 99.99th=[   84]
  66.     lat (usec) : 2=1.99%, 4=85.37%, 10=0.08%, 20=0.14%, 50=12.40%
  67.     lat (usec) : 100=0.02%
  68.   cpu          : usr=16.62%, sys=82.85%, ctx=1, majf=0, minf=9
  69.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  70.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  71.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  72.      issued    : total=r=65536/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  73.      latency   : target=0, window=0, percentile=100.00%, depth=1
  74.  
  75. Run status group 0 (all jobs):
  76.    READ: io=1024.0MB, aggrb=2694.8MB/s, minb=2694.8MB/s, maxb=2694.8MB/s, mint=380msec, maxt=380msec
  77. ------------------------------------------------------------------------------------------------------------------------
  78.  
  79. - 32K block size – 100% Reads
  80. fio --direct=0 --name=seqread --rw=read --ioengine=sync --bs=32k --numjobs=1 --size=1G --runtime=600
  81.  
  82. seqread: (groupid=0, jobs=1): err= 0: pid=13762: Mon Mar 16 07:38:18 2020
  83.   read : io=1024.0MB, bw=3282.6MB/s, iops=105025, runt=   312msec
  84.     clat (usec): min=2, max=126, avg= 8.55, stdev=10.29
  85.      lat (usec): min=2, max=127, avg= 8.73, stdev=10.29
  86.     clat percentiles (usec):
  87.      |  1.00th=[    2],  5.00th=[    2], 10.00th=[    2], 20.00th=[    2],
  88.      | 30.00th=[    3], 40.00th=[    3], 50.00th=[    3], 60.00th=[    3],
  89.      | 70.00th=[    3], 80.00th=[   24], 90.00th=[   26], 95.00th=[   28],
  90.      | 99.00th=[   31], 99.50th=[   32], 99.90th=[   40], 99.95th=[   46],
  91.      | 99.99th=[   90]
  92.     lat (usec) : 4=72.22%, 10=2.73%, 20=0.16%, 50=24.85%, 100=0.03%
  93.     lat (usec) : 250=0.01%
  94.   cpu          : usr=6.11%, sys=92.93%, ctx=1, majf=0, minf=16
  95.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  96.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  97.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  98.      issued    : total=r=32768/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  99.      latency   : target=0, window=0, percentile=100.00%, depth=1
  100.  
  101. Run status group 0 (all jobs):
  102.    READ: io=1024.0MB, aggrb=3282.6MB/s, minb=3282.6MB/s, maxb=3282.6MB/s, mint=312msec, maxt=312msec
  103. ------------------------------------------------------------------------------------------------------------------------
  104.  
  105. - 64K block size – 100% Reads
  106. fio --direct=0 --name=seqread --rw=read --ioengine=sync --bs=64k --numjobs=1 --size=1G --runtime=600
  107.  
  108. seqread: (groupid=0, jobs=1): err= 0: pid=12695: Mon Mar 16 07:37:42 2020
  109.   read : io=1024.0MB, bw=4015.8MB/s, iops=64250, runt=   255msec
  110.     clat (usec): min=3, max=104, avg=14.57, stdev=11.41
  111.      lat (usec): min=3, max=105, avg=14.75, stdev=11.41
  112.     clat percentiles (usec):
  113.      |  1.00th=[    3],  5.00th=[    3], 10.00th=[    3], 20.00th=[    3],
  114.      | 30.00th=[    3], 40.00th=[    4], 50.00th=[   18], 60.00th=[   24],
  115.      | 70.00th=[   25], 80.00th=[   26], 90.00th=[   27], 95.00th=[   28],
  116.      | 99.00th=[   31], 99.50th=[   33], 99.90th=[   44], 99.95th=[   68],
  117.      | 99.99th=[   99]
  118.     lat (usec) : 4=31.15%, 10=18.79%, 20=0.11%, 50=49.88%, 100=0.07%
  119.     lat (usec) : 250=0.01%
  120.   cpu          : usr=4.33%, sys=94.88%, ctx=1, majf=0, minf=22
  121.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  122.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  123.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  124.      issued    : total=r=16384/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  125.      latency   : target=0, window=0, percentile=100.00%, depth=1
  126.  
  127. Run status group 0 (all jobs):
  128.    READ: io=1024.0MB, aggrb=4015.8MB/s, minb=4015.8MB/s, maxb=4015.8MB/s, mint=255msec, maxt=255msec
  129. ------------------------------------------------------------------------------------------------------------------------
  130.  
  131. - 128K block size – 100% Reads
  132. fio --direct=0 --name=seqread --rw=read --ioengine=sync --bs=128k --numjobs=1 --size=1G --runtime=600
  133.  
  134. seqread: (groupid=0, jobs=1): err= 0: pid=14257: Mon Mar 16 07:38:36 2020
  135.   read : io=1024.0MB, bw=4413.9MB/s, iops=35310, runt=   232msec
  136.     clat (usec): min=17, max=184, avg=27.28, stdev= 3.90
  137.      lat (usec): min=18, max=184, avg=27.47, stdev= 3.90
  138.     clat percentiles (usec):
  139.      |  1.00th=[   22],  5.00th=[   24], 10.00th=[   24], 20.00th=[   25],
  140.      | 30.00th=[   26], 40.00th=[   26], 50.00th=[   27], 60.00th=[   28],
  141.      | 70.00th=[   28], 80.00th=[   29], 90.00th=[   30], 95.00th=[   31],
  142.      | 99.00th=[   34], 99.50th=[   47], 99.90th=[   72], 99.95th=[   96],
  143.      | 99.99th=[  185]
  144.     lat (usec) : 20=0.17%, 50=99.40%, 100=0.39%, 250=0.04%
  145.   cpu          : usr=3.03%, sys=95.24%, ctx=1, majf=0, minf=42
  146.   IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
  147.      submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  148.      complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
  149.      issued    : total=r=8192/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
  150.      latency   : target=0, window=0, percentile=100.00%, depth=1
  151.  
  152. Run status group 0 (all jobs):
  153.    READ: io=1024.0MB, aggrb=4413.9MB/s, minb=4413.9MB/s, maxb=4413.9MB/s, mint=232msec, maxt=232msec
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