FIO參數

filename=/export/1.txt　支持文件系統或者裸設備，-filename=/dev/sda2或-filename=/dev/sdb

direct=1測試過程繞過機器自帶的buffer，使測試結果更真實

rw=randwread 測試隨機讀的I/O

rw=randwrite 測試隨機寫的I/O

rw=randrw 測試隨機混合寫和讀的I/O

rw=read 測試順序讀的I/O

rw=write 測試順序寫的I/O

rw=rw 測試順序混合寫和讀的I/O

bs=4k 單次io的塊文件大小為4k

bsrange=512-2048同上，提定數據塊的大小范圍

size=5g 本次的測試文件大小為5g，以每次4k的io進行測試

numjobs=30本次的測試線程為30

runtime=1000測試時間為1000秒，如果不寫則一直將5g文件分4k每次寫完為止

ioengine=psync io引擎使用pync方式，如果要使用libaio引擎，需要yum install libaio-devel包

rwmixwrite=30 在混合讀寫的模式下，寫占30%group_reporting 關于顯示結果的，匯總每個進程的信息

lockmem=1g 只使用1g內存進行測試

zero_buffers 用0初始化系統buffer

nrfiles=8 每個進程生成文件的數量

ioengine參數

sync：Basic read(2) or write(2) I/O. fseek(2) is used to position the I/O location.

psync：Basic pread(2) or pwrite(2) I/O.

vsync: Basic readv(2) or writev(2) I/O. Will emulate queuing by coalescing adjacents IOs into a single submission.

libaio: Linux native asynchronous I/O.

posixaio: glibc POSIX asynchronous I/O using aio_read(3) and aio_write(3).

mmap: File is memory mapped with mmap(2) and data copied using memcpy(3).

splice： splice(2) is used to transfer the data and vmsplice(2) to transfer data from user-space to the kernel.

syslet-rw： Use the syslet system calls to make regular read/write asynchronous.

sg：SCSI generic sg v3 I/O.

net ： Transfer over the network. filename must be set appropriately to `host/port’ regardless of data direction. If receiving,only the port argument is used.

netsplice： Like net, but uses splice(2) and vmsplice(2) to map data and send/receive.

guasi: The GUASI I/O engine is the Generic Userspace Asynchronous Syscall Interface approach to asycnronous I/O.

測試結果解讀

4k隨機讀寫，70%讀+30%寫，30個并發

fio -filename=/export/1.txt -direct=1 -iodepth 1 -thread -rw=randrw -rwmixread=70 -ioengine=psync -bs=4k -size=10G -numjobs=30 -runtime=60 -group_reporting -name=randrw_70read_4k

輸出結果：

Jobs: 30 (f=30): [mmmmmmmmmmmmmmmmmmmmmmmmmmmmmm] [100.0% done] [99648K/42236K/0K /s] [24.1K/10.6K/0iops] [eta 00m:00s]

randrw_70read_4k: (groupid=0, jobs=30): err= 0: pid=4183: Sun May 5 14:56:16 2019read : io=5873.2MB, bw=100232KB/s, iops=25057 , runt=60002msec

clat (usec): min=129 , max=17247 , avg=872.95, stdev=884.86lat (usec): min=129 , max=17247 , avg=873.04, stdev=884.86clat percentiles (usec):| 1.00th=[ 141], 5.00th=[ 149], 10.00th=[ 157], 20.00th=[ 175],| 30.00th=[ 193], 40.00th=[ 788], 50.00th=[ 988], 60.00th=[ 1096],| 70.00th=[ 1192], 80.00th=[ 1304], 90.00th=[ 1448], 95.00th=[ 1576],| 99.00th=[ 2640], 99.50th=[ 8512], 99.90th=[ 9152], 99.95th=[ 9280],| 99.99th=[10048]

bw (KB/s) : min= 2680, max= 3992, per=3.34%, avg=3342.81, stdev=180.17write: io=2519.1MB, bw=43005KB/s, iops=10751 , runt=60002msec

clat (usec): min=45 , max=21382 , avg=750.66, stdev=874.94lat (usec): min=45 , max=21382 , avg=750.85, stdev=874.94clat percentiles (usec):| 1.00th=[ 52], 5.00th=[ 57], 10.00th=[ 60], 20.00th=[ 68],| 30.00th=[ 79], 40.00th=[ 644], 50.00th=[ 868], 60.00th=[ 988],| 70.00th=[ 1080], 80.00th=[ 1192], 90.00th=[ 1320], 95.00th=[ 1448],| 99.00th=[ 1816], 99.50th=[ 8384], 99.90th=[ 9024], 99.95th=[ 9280],| 99.99th=[ 9920]

bw (KB/s) : min= 1016, max= 2064, per=3.34%, avg=1434.25, stdev=131.77lat (usec) :50=0.06%, 100=11.02%, 250=26.21%, 500=0.67%, 750=2.40%lat (usec) :1000=13.91%lat (msec) :2=44.51%, 4=0.41%, 10=0.79%, 20=0.01%, 50=0.01%cpu : usr=0.19%, sys=2.19%, ctx=4148485, majf=0, minf=18446744073708663675IO 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=1503524/w=645100/d=0, short=r=0/w=0/d=0Run status group0(all jobs):

READ: io=5873.2MB, aggrb=100231KB/s, minb=100231KB/s, maxb=100231KB/s, mint=60002msec, maxt=60002msec

WRITE: io=2519.1MB, aggrb=43005KB/s, minb=43005KB/s, maxb=43005KB/s, mint=60002msec, maxt=60002msec

Disk stats (read/write):

sda: ios=1499788/643481, merge=0/1, ticks=271811/40234, in_queue=311058, util=98.88%

縮寫解釋：

io=執行了多少M的IO

bw=平均IO帶寬

iops=IOPS

runt=線程運行時間

slat=提交延遲

clat=完成延遲

lat=響應時間

bw=帶寬

cpu=利用率

IO depths=io隊列

IO submit=單個IO提交要提交的IO數

IO complete=Like the above submit number, but forcompletions instead.

IO issued=The number of read/write requests issued, and how many of them were short.

IO latencies=IO完延遲的分布

io=總共執行了多少size的IO

aggrb=group總帶寬

minb=最小.平均帶寬.

maxb=最大平均帶寬.

mint=group中線程的最短運行時間.

maxt=group中線程的最長運行時間.

ios=所有group總共執行的IO數.

merge=總共發生的IO合并數.

ticks=Number of ticks we kept the disk busy.

io_queue=花費在隊列上的總共時間.

util=磁盤利用率

在8塊800GB的SSD做RAID 10的存儲上使用psync引擎進行測試，測試結果：

4k+70%隨機讀+30%隨機寫: 24.1K+10.6K

4k+100%隨機讀: 127K

4k+100%隨機寫: 16.2K

1k+70%隨機讀+30%隨機寫: 23.4K+10.4K

1k+100%隨機讀: 131K

1k+100%隨機寫: 13.8K

上面跑的時間較短，測試誤差較大！

抄自：

https://www.cnblogs.com/raykuan/p/6914748.html

http://blog.yufeng.info/archives/1497

http://blog.yufeng.info/archives/677

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