TCMalloc Performance Optimization for a Self-Managed Deployment用于自我管理部署的TCMalloc性能优化

Create the systemd unit file创建systemd单元文件

Create the following file and save it at /etc/systemd/system/enable-transparent-huge-pages.service:创建以下文件并将其保存在/etc/systemd/system/enable-transparent-huge-pages.service：

[Unit]
Description=Enable Transparent Hugepages (THP)
DefaultDependencies=no
After=sysinit.target local-fs.target
Before=mongod.service

[Service]
Type=oneshot
ExecStart=/bin/sh -c 'echo always | tee /sys/kernel/mm/transparent_hugepage/enabled > /dev/null && echo defer+madvise | tee /sys/kernel/mm/transparent_hugepage/defrag > /dev/null && echo 0 | tee /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none > /dev/null && echo 1 | tee /proc/sys/vm/overcommit_memory > /dev/null'

[Install]
WantedBy=basic.target

/sys/kernel/mm/redhat_transparent_hugepage/enabled

Reload systemd unit files重新加载systemd单元文件

To reload the systemd unit files and make enable-transparent-huge-pages.service available for use, run the following command :要重新加载systemd单元文件并启用enable-transparent-huge-pages.service，请运行以下命令：

sudo systemctl daemon-reload

Start the service启动服务

Run:运行：

sudo systemctl start enable-transparent-huge-pages

To verify that the relevant THP settings have changed, run the following command:要验证相关THP设置是否已更改，请运行以下命令：

cat /sys/kernel/mm/transparent_hugepage/enabled && cat /sys/kernel/mm/transparent_hugepage/defrag && cat /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none && cat /proc/sys/vm/overcommit_memory

On Red Hat Enterprise Linux and potentially other Red Hat-based derivatives, you may instead need to use the following:在Red Hat Enterprise Linux和其他可能基于Red Hat的衍生产品上，您可能需要使用以下内容：

cat /sys/kernel/mm/redhat_transparent_hugepage/enabled && cat /sys/kernel/mm/redhat_transparent_hugepage/defrag && cat /sys/kernel/mm/redhat_transparent_hugepage/khugepaged/max_ptes_none && cat /proc/sys/vm/overcommit_memory

The output should resemble the following:输出应类似于以下内容：

always
defer+madvise
0
1

Configure your operating system to run it on boot.配置操作系统以在启动时运行它。

To ensure that this setting is applied each time the operating system starts, run the following command:为确保每次启动操作系统时都应用此设置，请运行以下命令：

sudo systemctl enable enable-transparent-huge-pages

(Optional) Customize tuned or ktune profile（可选）自定义调谐或ktune配置文件

If you use tuned or ktune proffiles on RHEL/ CentOS, you must also create a custom tuned profile.

Create the init.d script创建init.d脚本

Create the following file and save it at /etc/init.d/enable-transparent-hugepages:创建以下文件并将其保存在/etc/init.d/enable-transparent-hugepages：

#!/bin/bash
### BEGIN INIT INFO
# Provides:          enable-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: Enable Linux Transparent Hugepages
# Description:       Enable Linux Transparent Hugepages, 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 'always' | tee ${thp_path}/enabled > /dev/null && echo defer+madvise | tee ${thp_path}/defrag > /dev/null && echo 0 | tee ${thp_path}/khugepaged/max_ptes_none > /dev/null && echo 1 | tee /proc/sys/vm/overcommit_memory > /dev/null'

    unset thp_path
    ;;
esac

Make the script executable使脚本可执行

Run:运行：

sudo chmod 755 /etc/init.d/enable-transparent-hugepages

Run the script运行脚本

Run:运行：

sudo /etc/init.d/enable-transparent-hugepages start

To verify that the relevant THP settings have changed, run the following command:要验证相关THP设置是否已更改，请运行以下命令：

cat /sys/kernel/mm/transparent_hugepage/enabled && cat /sys/kernel/mm/transparent_hugepage/defrag && cat /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none && cat /proc/sys/vm/overcommit_memory

On Red Hat Enterprise Linux and potentially other Red Hat-based derivatives, you may instead need to use the following:在Red Hat Enterprise Linux和其他可能基于Red Hat的衍生产品上，您可能需要使用以下内容：

cat /sys/kernel/mm/redhat_transparent_hugepage/enabled

The output should resemble the following:输出应类似于以下内容：

always
defer+madvise
0
1

Configure your operating system to run it on boot配置操作系统以在启动时运行它

To ensure that this setting is applied each time the operating sytem starts, run the following command for your Linux distribution:为确保每次启动操作系统时都应用此设置，请为Linux发行版运行以下命令：

sudo update-rc.d enable-transparent-hugepages defaults

sudo insserv /etc/init.d/enable-transparent-hugepages

sudo chkconfig --add enable-transparent-hugepages

(Optional) Customize tuned or ktune profile自定义调谐或ktune配置文件

If you are using tuned or ktune profiles on RHEL/ CentOS, you must also create a custom tuned profile.