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Hi guys
I want to build a test scenario to see the difference in performance between the size of DAX windows and the size of read files. But it's not that I don't know how to build.
I tried the following two methods, but it seems that the performance results are similar

fio -filename=/usr/share/nginx/html/400MBfile --rw=randread --loops=10 --group_reporting --name=400MBfile

fio -filename=/usr/share/nginx/html/5Gfile --rw=randread -bs=16k --group_reporting --name=5Gfile

sh-4.4# fio -filename=/usr/share/nginx/html/5Gfile  --rw=randread -bs=16k  --group_reporting --name=5Gfile
5Gfile: (g=0): rw=randread, bs=(R) 16.0KiB-16.0KiB, (W) 16.0KiB-16.0KiB, (T) 16.0KiB-16.0KiB, ioengine=psync, iodepth=1
fio-3.19
Starting 1 process
Jobs: 1 (f=1): [r(1)][100.0%][r=148MiB/s][r=9450 IOPS][eta 00m:00s]
5Gfile: (groupid=0, jobs=1): err= 0: pid=139: Thu Jul  1 09:38:07 2021
  read: IOPS=9931, BW=155MiB/s (163MB/s)(5120MiB/32993msec)
    clat (usec): min=52, max=18734, avg=95.79, stdev=69.49
     lat (usec): min=53, max=18735, avg=96.47, stdev=69.53
    clat percentiles (usec):
     |  1.00th=[   61],  5.00th=[   64], 10.00th=[   66], 20.00th=[   71],
     | 30.00th=[   75], 40.00th=[   79], 50.00th=[   82], 60.00th=[   88],
     | 70.00th=[   97], 80.00th=[  114], 90.00th=[  141], 95.00th=[  163],
     | 99.00th=[  235], 99.50th=[  293], 99.90th=[  734], 99.95th=[  807],
     | 99.99th=[ 1287]
   bw (  KiB/s): min=87471, max=191168, per=100.00%, avg=159511.97, stdev=18299.18, samples=65
   iops        : min= 5466, max=11948, avg=9969.48, stdev=1143.77, samples=65
  lat (usec)   : 100=72.93%, 250=26.28%, 500=0.52%, 750=0.19%, 1000=0.06%
  lat (msec)   : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%
  cpu          : usr=6.04%, sys=46.45%, ctx=329379, majf=1, minf=13
  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=327680,0,0,0 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=155MiB/s (163MB/s), 155MiB/s-155MiB/s (163MB/s-163MB/s), io=5120MiB (5369MB), run=32993-32993msec

Best Regards,
--
ryo li

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