How to use fio

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 eMMC throughput writing to QNX partition
time sh -c "dd if=/dev/zero of=/dev/hd0.qnx6.ifs_qnxhyp_b" bs=4096 count=12700 && sync

We can also use system OR data partition to write as they are of more size. Other partitions are of ~10 MBs we can check and verify the same with less data transfer accordingly. Check size availability using df -h command   

eMMC throughput reading from QNX partition
time sh -c "dd of=/dev/null if=/dev/hd0.qnx6.ifs_qnxhyp_b" bs=4096 count=12700 && sync  

eMMC throughput writing to Android partition
time sh -c "dd if=/dev/zero of=/dev/block/vda4" bs=4096 count=12700 && sync  

eMMC throughput reading from Android partition
time sh -c "dd of=/dev/null if=/dev/block/vda4" bs=4096 count=12700 && sync    

Verify QNX eMMC partitions are not available to Android
From Android console :-
time sh -c "dd if=/dev/zero of="TBD" bs=512000 count=1024 && sync"  
From QNX Console :-
time sh -c "dd if=/dev/zero of="TBD" bs=512000 count=1024 && sync"     

Read from Android emmc partition and QNX partition simultaneously
From Android console :-
time sh -c "dd of=/dev/null if=/dev/block/vda4" bs=4096 count=12700 && sync   
From QNX Console :-
time sh -c "dd of=/dev/null if=/dev/hd0.qnx6.ifs_qnxhyp_b" bs=4096 count=12700 && sync     

Verify QNX eMMC partitions are not available to non root android processes.
QNX Side: Go to /dev/hd0 tab. We will get list of partitions. Out of which some are QNX specific (vda partitions from vda 3 to vda14) and some are android Specific. We should not be able to write QNX partition from Android except root.Android console :- ls /dev/block/vda tab.  We should be able to see complete list but not able to write on any partition between vda3 to vda14 partitions in list except SU (root).


titan_vhywrd_a0:/storage/self/primary #  time dd if=/dev/zero of=testfile.img bs=1024 count=102400
102400+0 records in
102400+0 records out
104857600 bytes (100 M) copied, 0.990338 s, 101 M/s
    0m01.01s real     0m00.02s user     0m00.26s system
   
titan_vhywrd_a0:/storage/self/primary # time dd if=testfile.img of=/dev/null bs=1024 count=102400
102400+0 records in
102400+0 records out
104857600 bytes (100 M) copied, 0.273368 s, 366 M/s
    0m00.29s real     0m00.03s user     0m00.21s system   


fio in android
---------------

fio random read

#./fio -filename=/data/test_rand -direct=1 -iodepth=1 -thread -rw=randread -ioengine=psync -bs=1M -size=100M -numjobs=4 -group_reporting -name=rand_read   
rand_read: (g=0): rw=randread, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=psync, iodepth=1
...
fio-3.28-128-gfab60
Starting 4 threads
rand_read: Laying out IO file (1 file / 100MiB)
Jobs: 4 (f=4): [r(4)][87.5%][r=61.9MiB/s][r=61 IOPS][eta 00m:01s]
rand_read: (groupid=0, jobs=4): err= 0: pid=7477: Mon Nov  8 22:14:24 2021
  read: IOPS=62, BW=62.2MiB/s (65.2MB/s)(400MiB/6435msec)
    clat (msec): min=14, max=163, avg=62.66, stdev=21.32
     lat (msec): min=14, max=163, avg=62.66, stdev=21.32
    clat percentiles (msec):
     |  1.00th=[   16],  5.00th=[   35], 10.00th=[   40], 20.00th=[   46],
     | 30.00th=[   50], 40.00th=[   55], 50.00th=[   60], 60.00th=[   66],
     | 70.00th=[   71], 80.00th=[   79], 90.00th=[   91], 95.00th=[  102],
     | 99.00th=[  123], 99.50th=[  138], 99.90th=[  163], 99.95th=[  163],
     | 99.99th=[  163]
   bw (  KiB/s): min=53165, max=73687, per=99.93%, avg=63607.67, stdev=1857.41, samples=48
   iops        : min=   49, max=   71, avg=60.50, stdev= 1.87, samples=48
  lat (msec)   : 20=1.25%, 50=29.75%, 100=63.50%, 250=5.50%
  cpu          : usr=0.04%, sys=1.12%, ctx=425, majf=0, minf=1030
  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=400,0,0,0 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=62.2MiB/s (65.2MB/s), 62.2MiB/s-62.2MiB/s (65.2MB/s-65.2MB/s), io=400MiB (419MB), run=6435-6435msec

Disk stats (read/write):
  sda: ios=12490/6, merge=0/6, ticks=686299/203, in_queue=661588, util=98.44%
titan_vfmt_ghqc:/data #
titan_vfmt_ghqc:/data # ./fio -filename=/data/test_rand -direct=1 -iodepth=1 -thread -rw=randread -ioengine=psync -bs=1M -size=100M -numjobs=4 -group_reporting -name=rand_read   
rand_read: (g=0): rw=randread, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=psync, iodepth=1
...
fio-3.28-128-gfab60
Starting 4 threads
Jobs: 4 (f=4): [r(4)][100.0%][r=61.0MiB/s][r=61 IOPS][eta 00m:00s]
rand_read: (groupid=0, jobs=4): err= 0: pid=7846: Mon Nov  8 22:16:06 2021
  read: IOPS=59, BW=59.9MiB/s (62.9MB/s)(400MiB/6673msec)
    clat (msec): min=14, max=149, avg=65.88, stdev=20.80
     lat (msec): min=14, max=149, avg=65.88, stdev=20.80
    clat percentiles (msec):
     |  1.00th=[   28],  5.00th=[   33], 10.00th=[   42], 20.00th=[   49],
     | 30.00th=[   54], 40.00th=[   60], 50.00th=[   65], 60.00th=[   69],
     | 70.00th=[   74], 80.00th=[   83], 90.00th=[   92], 95.00th=[  104],
     | 99.00th=[  131], 99.50th=[  134], 99.90th=[  150], 99.95th=[  150],
     | 99.99th=[  150]
   bw (  KiB/s): min=49077, max=73687, per=99.64%, avg=61161.61, stdev=1923.48, samples=51
   iops        : min=   45, max=   71, avg=58.53, stdev= 1.97, samples=51
  lat (msec)   : 20=0.25%, 50=23.50%, 100=69.25%, 250=7.00%
  cpu          : usr=0.04%, sys=0.98%, ctx=434, majf=0, minf=1031
  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=400,0,0,0 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=59.9MiB/s (62.9MB/s), 59.9MiB/s-59.9MiB/s (62.9MB/s-62.9MB/s), io=400MiB (419MB), run=6673-6673msec

Disk stats (read/write):
  sda: ios=12730/2, merge=0/4, ticks=723659/80, in_queue=698188, util=98.63%
 
fio sequential write
---------------------
./fio -filename=/data/test_ordwrite -direct=1 -iodepth=1 -thread -rw=write -ioengine=psync -bs=1M -size=100M -numjobs=4 -group_reporting -name=seq_write

fio seq read:
-------------
./fio -filename=/data/test_ordread -direct=1 -iodepth=1 -thread -rw=read -ioengine=psync -bs=1M -size=100M -numjobs=4 -group_reporting -name=seq_read

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