mongodb3.4.4 禁止透明大页的实践过程

 mongodb3.4.4 禁止透明大页的实践过程

环境

• 系统 centos7.1
• mongodb 3.4.4

当前透明大页状态

cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
cat /sys/kernel/mm/transparent_hugepage/defrag
always madvise [never]

状态分类及含义

• [always]:开启
• [madvise]:使用madvise函数调用时有效
• [never]:禁止

禁止脚本

cat /etc/init.d/disable-transparent-hugepages
#!/bin/bash
### BEGIN INIT INFO
# Provides:          disable-transparent-hugepages
# Required-Start:    $local_fs
# Required-Stop:
# X-Start-Before:    mongod mongodb-mms-automation-agent
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Disable Linux transparent huge pages
# Description:       Disable Linux transparent huge pages, to improve
#                    database performance.
### END INIT INFO

case $1 in
  start)
    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/transparent_hugepage
    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
    else
      return 0
    fi

    echo 'never' > ${thp_path}/enabled
    echo 'never' > ${thp_path}/defrag

    re='^[0-1]+$'
    if [[ $(cat ${thp_path}/khugepaged/defrag) =~ $re ]]
    then
      # RHEL 7
      echo 0  > ${thp_path}/khugepaged/defrag
    else
      # RHEL 6
      echo 'no' > ${thp_path}/khugepaged/defrag
    fi

    unset re
    unset thp_path
    ;;
esac

运行

chmod 0755 /etc/init.d/disable-transparent-hugepages

/etc/init.d/disable-transparent-hugepages start

参考与致谢

Linux 关于Transparent Hugepages的介绍