Flashcache¶

До fashcache

monkey ~ # fio -readonly -name iops -rw=randread -bs=4096 -runtime=20 -iodepth 1 -filename /dev/vda -ioengine libaio -direct=1
iops: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=1
fio 2.0.7
Starting 1 process
Jobs: 1 (f=1): [r] [100.0% done] [482K/0K /s] [117 /0  iops] [eta 00m:00s]
iops: (groupid=0, jobs=1): err= 0: pid=2941
  read : io=8892.0KB, bw=455156 B/s, iops=111 , runt= 20005msec
    slat (usec): min=8 , max=312 , avg=35.66, stdev=21.26
    clat (usec): min=487 , max=68000 , avg=8957.66, stdev=4331.27
     lat (usec): min=528 , max=68015 , avg=8995.32, stdev=4332.05
    clat percentiles (usec):
     |  1.00th=[ 3440],  5.00th=[ 4512], 10.00th=[ 5024], 20.00th=[ 5920],
     | 30.00th=[ 6816], 40.00th=[ 7776], 50.00th=[ 8640], 60.00th=[ 9536],
     | 70.00th=[10432], 80.00th=[11200], 90.00th=[12096], 95.00th=[12864],
     | 99.00th=[27264], 99.50th=[36608], 99.90th=[52992], 99.95th=[60160],
     | 99.99th=[68096]
    bw (KB/s)  : min=  285, max=  503, per=99.99%, avg=443.95, stdev=49.29
    lat (usec) : 500=0.04%
    lat (msec) : 2=0.18%, 4=1.62%, 10=64.37%, 20=32.07%, 50=1.57%
    lat (msec) : 100=0.13%
  cpu          : usr=0.11%, sys=0.61%, ctx=2230, majf=0, minf=21
  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    : total=r=2223/w=0/d=0, short=r=0/w=0/d=0

Run status group 0 (all jobs):
   READ: io=8892KB, aggrb=444KB/s, minb=444KB/s, maxb=444KB/s, mint=20005msec, maxt=20005msec

Disk stats (read/write):
  vda: ios=2197/2, merge=0/7, ticks=19630/103, in_queue=19728, util=98.76%