非一致存储访问结构 (NUMA : Non-Uniform Memory Access) 也是最新的内存管理技术。它和对称多处理器结构 (SMP : Symmetric Multi-Processor) 是对应的。
MySQL单机单实例,建议关闭NUMA,关闭的方法有三种:
1.硬件层,在BIOS中设置关闭;
2.OS内核,启动时设置numa=off;
3.可以用numactl命令将内存分配策略修改为interleave(交叉)
登录Linux系统,修改/etc/init.d/mysqld文件,加上numactl --interleave all
vi /etc/init.d/mysqld
找到如下行
# Give extra arguments to mysqld with the my.cnf file. This script
# may be overwritten at next upgrade.
$bindir/mysqld_safe --datadir="$datadir" --pid-file="$mysqld_pid_file_path" $other_args >/dev/null &
wait_for_pid created "$!" "$mysqld_pid_file_path"; return_value=$?
将$bindir/mysqld_safe --datadir="$datadir"这一行修改为:
/usr/bin/numactl --interleave all $bindir/mysqld_safe --datadir="$datadir" --pid-file="$mysqld_pid_file_path" $other_args >/dev/null &
wait_for_pid created "$!" "$mysqld_pid_file_path"; return_value=$?
然后重启MySQL服务
译者介绍:家华,从事mysqlDBA的工作,记录自己对mysql的一些总结