目次

tuned

Linuxのパフォーマンス・チューニング

I/Oスケジューラーを調整する。 

yum install -y tuned
tuned-adm profile enterprise-storage
tuned-adm profile virtual-guest

とめかた 

tuned-adm off

プロファイルのリスト 

tuned-adm list

REDHATの日本語の説明
https://access.redhat.com/documentation/ja-JP/Red_Hat_Enterprise_Linux/6/html/Power_Management_Guide/tuned-adm.html

tuned default と virtual-host の差

ioscheduler 

## defautl
io_timeout 30000
max_segment_size 65536
physical_block_size 512


## virtual-host
io_timeout 90000
max_segment_size 4294967295
physical_block_size 4096

cpu governor 

## default
# cpufreq-info -p
800000 2201000 ondemand

## virtual-host
# cpufreq-info -p
800000 2201000 performance

tuned 変更後のパフォーマンス差

### default
           "Seq-Read" bw:482MB iops:  470 latency:ms"4":91.992188
          "Seq-Write" bw:433MB iops:  423 latency:ms"4":100
      "Rand-Read-16K" bw: 56MB iops: 3534 latency:us"250":53.817749
     "Rand-Write-16K" bw: 50MB iops: 3144 latency:us"500":88.792419
       "Rand-Read-4K" bw: 14MB iops: 3700 latency:us"250":92.725397
      "Rand-Write-4K" bw: 19MB iops: 4819 latency:us"250":94.06662
  "Rand-Read-4K-QD32" bw:289MB iops:72455 latency:us"500":60.264206
 "Rand-Write-4K-QD32" bw:144MB iops:36048 latency:us"1000":41.949081


### virtual-host
           "Seq-Read" bw:536MB iops:  523 latency:ms"2":99.902344
          "Seq-Write" bw:500MB iops:  488 latency:ms"4":89.453125
      "Rand-Read-16K" bw:119MB iops: 7488 latency:us"250":99.998474
     "Rand-Write-16K" bw:290MB iops:18174 latency:us"100":89.659119
       "Rand-Read-4K" bw: 36MB iops: 9147 latency:us"250":83.566666
      "Rand-Write-4K" bw:125MB iops:31334 latency:us"50":99.995041
  "Rand-Read-4K-QD32" bw:324MB iops:81033 latency:us"500":93.238831
 "Rand-Write-4K-QD32" bw:304MB iops:76027 latency:us"500":99.699402
,