使用jemalloc优化nginx和mysql内存管理

预先安装autoconf 和 make

yum -y install autoconf make

jemalloc的安装
jiemalloc 开源项目网站 http://www.canonware.com/jemalloc/

wget http://www.canonware.com/download/jemalloc/jemalloc-3.6.0.tar.bz2
tar -xjf jemalloc-3.6.0.tar.bz2
cd jemalloc-3.6.0
./configure --prefix=/usr/local/jemalloc --libdir=/usr/local/lib
make && make install
make clean
cd ../

echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf
/sbin/ldconfig

使用jemalloc优化MYSQL数据库
MYSQL或者MariaDB源码编译时添加以下参数:

-DCMAKE_EXE_LINKER_FLAGS="-ljemalloc" -DWITH_SAFEMALLOC=OFF

或者编辑mysqld_safe文件直接加载:
查找文件 /usr/local/mysql/bin/mysqld_safe
在# executing mysqld_safe 下面加上

LD_PRELOAD=/usr/local/lib/libjemalloc.so

重新启动MYSQL

使用下面代码自动修改mysqld_safe文件

sed -i 's@executing mysqld_safe@executing mysqld_safe
export LD_PRELOAD=/usr/local/lib/libjemalloc.so@' /usr/local/mysql/bin/mysqld_safe
service mysqld restart

使用jemalloc优化NGINX
编译NGINX时添加以下参数:

--with-ld-opt="-ljemalloc"

验证 jemalloc 是否运行:

lsof -n | grep jemalloc