利用gperftools对nginx与mysql进行内存管理性能优化降低负载.
Gperftools是由谷歌开发。官方对gperftools的介绍为：
These tools are for use by developers so that they can create more robust applications. Especially of use to those developing multi-threaded applications in C++ with templates. Includes TCMalloc, heap-checker, heap-profiler and cpu-profiler.
首先下载软件安装包：
由于我们的系统为CentOS 5.8 x64的系统, 64位系统需要先安装libunwind支持库。
wget http://download./releases/libunwind/libunwind-1.1.tar.gz
gperftools 2.0版本
wget /files/gperftools-2.0.tar.gz
安装软件包
tar zxvf libunwind-1.1.tar.gz
cd libunwind-1.1
./configure
make && make install
tar zxvf gperftools-2.0.tar.gz
cd gperftools-2.0
./configure--enable-frame-pointers
make && make install
增加gperftools 线程目录
mkdir /tmp/tcmalloc
设置权限
chmod 777 /tmp/tcmalloc
配置lib库文件目录
vim /etc/ld.so.conf
增加
/usr/local/lib
/sbin/ldconfig使之生效
重新编译nginx使其支持gperftools
tar zxvf nginx-1.2.3.tar.gz
cd nginx-1.2.3
./configure --user=upload --group=upload --prefix=/opt/local/nginx --with-http_stub_status_module --with-http_ssl_module --with-google_perftools_module
make && make install
安装完毕以后，修改nginx配置文件nginx.conf
vim /opt/local/nginx/con/nginx.conf
在pid下面增加
#gperftools
google_perftools_profiles /tmp/tcmalloc;
然后保存，启动nginx
/opt/local/nginx/sbin/nginx -t查看配置是否正常
lsof -n | grep tcmalloc查看是否运行
nginx 18454 upload 10w REG 8,2 0 10780681 /tmp/tcmalloc.18454
nginx 18455 upload 12w REG 8,2 0 10780682 /tmp/tcmalloc.18455
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优化Mysql 则不需要重新编译mysql 只需要找到mysqld_safe 这个文件
在# executing mysqld_safe 下面加上
export LD_PRELOAD=/usr/local/lib/libtcmalloc.so
然后重启mysql 就可以啦.
