Ryo Li, On Thu, Jul 1, 2021 at 11:49 AM 李瑞友 <liruiyou@huayun.com> wrote:
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
I've looped in some folks from Red Hat and Intel who have been working with virtiofs, either on performance, on integration, or on virtiofs itself. I think they'll be able to provide you with some valuable feedback. Please, mind that due to July 4th I think folks from the US may be off for the next few days. Best Regards, -- Fabiano Fidêncio