fio を実行して、
[yoheia@www****** ~]$ fio -rw=randwrite -bs=4k -size=100m -directory=/tmp -direct=1 -numjobs=2 -name=file1 -ioengine=libaio file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=1 file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=1 fio-2.0.13 Starting 2 processes Jobs: 2 (f=2): [ww] [100.0% done] [0K/23276K/0K /s] [0 /5819 /0 iops] [eta 00m:00s] file1: (groupid=0, jobs=1): err= 0: pid=7657: Fri Sep 27 21:53:59 2013 write: io=102400KB, bw=12088KB/s, iops=3022 , runt= 8471msec slat (usec): min=11 , max=2807 , avg=36.99, stdev=39.82 clat (usec): min=1 , max=173352 , avg=288.07, stdev=1354.32 lat (usec): min=110 , max=173376 , avg=326.13, stdev=1355.00 clat percentiles (usec): | 1.00th=[ 118], 5.00th=[ 141], 10.00th=[ 157], 20.00th=[ 181], | 30.00th=[ 199], 40.00th=[ 217], 50.00th=[ 235], 60.00th=[ 255], | 70.00th=[ 278], 80.00th=[ 310], 90.00th=[ 366], 95.00th=[ 434], | 99.00th=[ 732], 99.50th=[ 1256], 99.90th=[ 7584], 99.95th=[18560], | 99.99th=[37632] bw (KB/s) : min= 6288, max=14424, per=49.78%, avg=12025.50, stdev=2526.34 lat (usec) : 2=0.01%, 4=0.10%, 20=0.01%, 50=0.02%, 100=0.15% lat (usec) : 250=57.70%, 500=39.20%, 750=1.85%, 1000=0.28% lat (msec) : 2=0.44%, 4=0.07%, 10=0.07%, 20=0.05%, 50=0.04% lat (msec) : 100=0.01%, 250=0.01% cpu : usr=3.36%, sys=17.18%, ctx=27386, majf=0, minf=25 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=0/w=25600/d=0, short=r=0/w=0/d=0 file1: (groupid=0, jobs=1): err= 0: pid=7658: Fri Sep 27 21:53:59 2013 write: io=102400KB, bw=12080KB/s, iops=3019 , runt= 8477msec slat (usec): min=11 , max=1623 , avg=36.58, stdev=33.44 clat (usec): min=1 , max=173516 , avg=288.41, stdev=1363.08 lat (usec): min=116 , max=173555 , avg=326.22, stdev=1364.14 clat percentiles (usec): | 1.00th=[ 117], 5.00th=[ 141], 10.00th=[ 157], 20.00th=[ 179], | 30.00th=[ 199], 40.00th=[ 217], 50.00th=[ 233], 60.00th=[ 253], | 70.00th=[ 278], 80.00th=[ 310], 90.00th=[ 370], 95.00th=[ 438], | 99.00th=[ 740], 99.50th=[ 1304], 99.90th=[ 8768], 99.95th=[17536], | 99.99th=[43776] bw (KB/s) : min= 6344, max=14616, per=49.74%, avg=12015.50, stdev=2565.50 lat (usec) : 2=0.01%, 4=0.06%, 10=0.01%, 20=0.01%, 50=0.02% lat (usec) : 100=0.16%, 250=58.10%, 500=38.70%, 750=2.00%, 1000=0.24% lat (msec) : 2=0.47%, 4=0.07%, 10=0.07%, 20=0.05%, 50=0.04% lat (msec) : 100=0.01%, 250=0.01% cpu : usr=3.10%, sys=17.30%, ctx=27293, majf=0, minf=23 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=0/w=25600/d=0, short=r=0/w=0/d=0 Run status group 0 (all jobs): WRITE: io=204800KB, aggrb=24159KB/s, minb=12079KB/s, maxb=12088KB/s, mint=8471msec, maxt=8477msec Disk stats (read/write): vda: ios=0/50678, merge=0/1, ticks=0/12806, in_queue=12739, util=82.55%
vmstat で様子を見ると、
[yoheia@www****** ~]$ vmstat 2 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 2 1 312 572960 91724 227320 0 0 0 7982 2061 4624 2 7 66 24 1 2 2 312 572960 91724 227320 0 0 0 22618 5738 13167 2 14 35 47 2 2 1 312 572960 91732 227312 0 0 0 26750 6600 15472 3 16 35 42 3 2 1 312 572960 91732 227320 0 0 0 27452 6743 15791 3 16 36 42 2 1 0 312 622436 91732 178520 0 0 0 17606 4321 10099 2 10 55 31 2
あれ、思ってたのと違った。
