btrfs 50:50 randrw "single" fio config

single-btrfs-rw5050.txt

rw5050: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32
...
fio-2.1.9
Starting 4 processes
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)
rw5050: Laying out IO file(s) (1 file(s) / 25600MB)

rw5050: (groupid=0, jobs=4): err= 0: pid=59524: Wed Jun 18 06:17:26 2014
  Description  : ["random 50/50"]
  read : io=60060MB, bw=102502KB/s, iops=25625, runt=600003msec
    slat (usec): min=103, max=8276.3K, avg=322.79, stdev=19587.74
    clat (usec): min=0, max=8286.1K, avg=1830.87, stdev=19068.40
     lat (usec): min=153, max=8287.9K, avg=2154.85, stdev=28026.30
    clat percentiles (usec):
     |  1.00th=[   94],  5.00th=[  163], 10.00th=[  229], 20.00th=[  390],
     | 30.00th=[  564], 40.00th=[  756], 50.00th=[ 1064], 60.00th=[ 1752],
     | 70.00th=[ 2320], 80.00th=[ 2704], 90.00th=[ 3344], 95.00th=[ 4960],
     | 99.00th=[ 8768], 99.50th=[13248], 99.90th=[30080], 99.95th=[39168],
     | 99.99th=[104960]
    bw (KB  /s): min=    2, max=34744, per=26.56%, avg=27221.30, stdev=5500.38
  write: io=60017MB, bw=102428KB/s, iops=25606, runt=600003msec
    slat (usec): min=104, max=8276.3K, avg=344.41, stdev=22214.65
    clat (usec): min=0, max=8277.6K, avg=2475.76, stdev=23389.15
     lat (usec): min=154, max=8285.6K, avg=2821.55, stdev=33060.73
    clat percentiles (usec):
     |  1.00th=[  127],  5.00th=[  418], 10.00th=[  596], 20.00th=[  876],
     | 30.00th=[ 1144], 40.00th=[ 1480], 50.00th=[ 1992], 60.00th=[ 2608],
     | 70.00th=[ 2960], 80.00th=[ 3312], 90.00th=[ 4128], 95.00th=[ 5536],
     | 99.00th=[ 8768], 99.50th=[12608], 99.90th=[27264], 99.95th=[37120],
     | 99.99th=[103936]
    bw (KB  /s): min=    0, max=34762, per=26.56%, avg=27207.08, stdev=5462.25
    lat (usec) : 2=0.01%, 4=0.28%, 10=0.05%, 20=0.03%, 50=0.13%
    lat (usec) : 100=0.43%, 250=5.97%, 500=9.84%, 750=10.74%, 1000=8.85%
    lat (msec) : 2=20.36%, 4=34.46%, 10=8.09%, 20=0.54%, 50=0.19%
    lat (msec) : 100=0.03%, 250=0.01%, 500=0.01%, 750=0.01%, 1000=0.01%
    lat (msec) : 2000=0.01%, >=2000=0.01%
  cpu          : usr=1.15%, sys=20.69%, ctx=14264932, majf=4, minf=194060
  IO depths    : 1=0.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.1%, 32=101.0%, >=64=0.0%
     submit    : 0=0.0%, 4=0.0%, 8=0.0%, 16=100.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=0.0%, 8=0.0%, 16=100.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=15375369/w=15364167/d=0, short=r=0/w=0/d=0
     latency   : target=0, window=0, percentile=100.00%, depth=32

Run status group 0 (all jobs):
   READ: io=60060MB, aggrb=102502KB/s, minb=102502KB/s, maxb=102502KB/s, mint=600003msec, maxt=600003msec
  WRITE: io=60017MB, aggrb=102427KB/s, minb=102427KB/s, maxb=102427KB/s, mint=600003msec, maxt=600003msec

zz_mkfs.sh

sudo mkfs.btrfs --data single --metadata raid10 --force /dev/sd[ijkl]1