1. jemalloc是干什么的呢？

官方说明：

jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support.
jemalloc干了malloc干的活，而且干得好一些，主要体现在避免内存碎片与并发扩展上

2. jemalloc安装

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wget https://github.com/jemalloc/jemalloc/releases/download/4.4.0/jemalloc-4.4.0.tar.bz2
tar jxvf jemalloc-4.4.0.tar.bz2
cd jemalloc-4.4.0/
./configure --prefix=/usr/local/webserver/jemalloc
make && make install

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echo '/usr/local/webserver/jemalloc/lib' > /etc/ld.so.conf.d/local.conf
/sbin/ldconfig #更新ld
 /sbin/ldconfig -p | grep jemalloc  #查询更新后的ld

3. 使用jemalloc优化Nginx

编译NGINX时添加以下参数:
–with-ld-opt=/usr/local/webserver/jemalloc/lib/libjemalloc.so.2
具体实现：

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cd nginx-1.12.1
make clean
./configure --prefix=/usr/local/webserver/nginx 
--with-ld-opt="/usr/local/webserver/jemalloc/lib/libjemalloc.so.2"
make && make install

4. 使用jemalloc优化MySQL

方法1.
MySQL/MaridDB 5.5编译方法，cmake预编译时加上下面参数

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-DCMAKE_EXE_LINKER_FLAGS="-ljemalloc" -DWITH_SAFEMALLOC=OFF
load_jemalloc=1

方法2.
修改mysqld_safe直接加载:
查找文件 /usr/local/mysql/bin/mysqld_safe
在#executing mysqld_safe 下面加上

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mysqld_ld_preload=/usr/local/webserver/jemalloc/lib/libjemalloc.so     #Percona Mysql

重新启动MYSQL

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systemctl restart mysql

使用下面代码自动修改mysqld_safe文件

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sed -i 's@executing mysqld_safe@executing mysqld_safe\nexport LD_PRELOAD=/usr/local/webserver/jemalloc/lib/libjemalloc.so@' /usr/local/webserver/mysql/bin/mysqld_safe
load_jemalloc=1

5. 验证 jemalloc 是否运行

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lsof -n | grep jemalloc

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