• centos6.8 hugepage设置


    本次操作是完成 centos68 hugepage的设置

    oracle 11g 在 linux 下强烈建议启用hugepage,否则如果进程过多的话会导致linux 的 pagetable 过大,物理内存不够用,产生页交换,进而影响oracle的性能。

    启用hugepage

    在/etc/security/limits.conf 添加如下行

    oracle soft memlock 60712408
    oracle hard memlock 60712408
    注意,这里设置的值均以kb为单位的(具体数字依据主机的内存大小)!
    设置用户内存配置,有个计算规则是:
    实际物理内存 > 锁定内存 >= HugePages_Total*Hugepagesize
    这个dba要简单比较下

    在/etc/sysctl.conf 添加如下行

    vm.nr_hugepages=17000

    运行oracle 的 hugepages_set.sh 脚本,给出建议值(必须在oracle启动状态下)
    或者手动计算nr_hugepages的公式:
    nr_hugepages>=sga(mb)/Hugepagesize(mb)

    os 刷新数据

    sync
    echo 3 > /proc/sys/vm/drop_cache

    禁用透明 hugepage

    临时修改
    echo “never” > /sys/kernel/mm/transparent_hugepage/enabled
    echo “never” > /sys/kernel/mm/redhat_transparent_hugepage/enabled

    永久修改
    vi /boot/grub/grub.conf
    kernel /vmlinuz-2.6.32-300.25.1.el6uek.x86_64 ro root=LABEL=/ transparent_hugepage=never

    或者
    vi /etc/rc.local
    echo ‘never’ > /sys/kernel/mm/transparent_hugepage/enabled
    echo ‘never’ > /sys/kernel/mm/transparent_hugepage/defrag

    下面是mos的内容
    开始
    To disable Transparent HugePages boot time either one of the following 2 methods may be used:

    Add the following to the kernel boot line in /etc/grub.conf (a symlink to /boot/grub/grub.conf) and reboot the server (this is the preferred method):

    transparent_hugepage=never
    Once modified the line will read similar to the following example:

    title Oracle Linux Server (2.6.32-300.25.1.el6uek.x86_64)
    root (hd0,0)
    kernel /vmlinuz-2.6.32-300.25.1.el6uek.x86_64 ro root=LABEL=/ transparent_hugepage=never
    initrd /initramfs-2.6.32-300.25.1.el6uek.x86_64.img

    OR

    Add the following lines in /etc/rc.local and reboot the server (this still can be done on Redhat 7 although rc.local is being deprecated):

    if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
    echo never > /sys/kernel/mm/transparent_hugepage/enabled
    fi
    if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
    echo never > /sys/kernel/mm/transparent_hugepage/defrag
    fi
    Please change the file path for RHEL kernel to /sys/kernel/mm/redhat_transparent_hugepage/ accordingly.

    结束
    grep AnonHugePages /proc/meminfo

    确认启用hugepage

    reboot
    cat /proc/meminfo |grep -i huge

    参考:
    ALERT: Disable Transparent HugePages on SLES11, RHEL6, RHEL7, OL6, OL7, and UEK2 and above (文档 ID 1557478.1)
    Oracle Linux: Shell Script to Calculate Values Recommended Linux HugePages / HugeTLB Configuration (文档 ID 401749.1)

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  • 原文地址:https://www.cnblogs.com/ctypyb2002/p/9793139.html
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