利用APR本地库提高Tomcat性能

日期：2020-09-30 栏目：程序人生浏览：次

Tomcat可以使用APR来提供超强的可伸缩性和性能，更好地集成本地服务器技术。APR(Apache Portable Runtime)是一个高可移植库，它是Apache HTTP Server 2.x的核心。APR有很多用途，包括访问高级IO功能(例如sendfile,epoll和OpenSSL)，OS级别功能(随机数生成，系统状态等等)，本地进程管理(共享内存，NT管道和UNIX sockets)。这些功能可以使Tomcat作为一个通常的前台WEB服务器，能更好地和其它本地web技术集成，总体上让Java更有效率作为一个高性能web服务器平台而不是简单作为后台容器。

在产品环境中，特别是直接使用Tomcat做WEB服务器的时候，您应该使用Tomcat Native来提高其性能，详细配置和安装请参考Tomcat文档。

如果没有apr技术，启动tomcat 时出现如下提示：

The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/jdk1.6.0_06/jre/lib/i386/client:/usr/java/jdk1.6.0_06/jre/lib/i386:/usr/java/jdk1.6.0_06/jre/../lib/i386:/usr/java/packages/lib/i386:/lib:/usr/lib

按照官方说明需要：

· APR library

· OpenSSL libraries

openssl 可以用 yum install openssl-devel，apr还是下载*.gz来安装。
下载https://archive.apache.org/dist/apr/

apr-1.4.6.tar.gz
apr-util-1.4.1.tar.gz
tomcat-native.tar.gz 可以在tomcat/bin目录下找到。

1、安装 apr

1. # tar zxvf apr-1.4.6.tar.gz

2. # cd apr-1.4.6

3. # ./configure

4. # make

5. # make install

备注：apr 默认安装在 /usr/local/apr

2、安装 apr-util

1. # tar zxvf apr-util-1.4.1.tar.gz

2. # cd apr-util-1.4.1

3. # ./configure --with-apr=/usr/local/apr

4. # make

5. # make install

安装好了之后会有个提示：----------------------------------------------------------

Libraries have been installed in:

/usr/local/apr/lib

If you ever happen to want to link against installed libraries

in a given directory, LIBDIR, you must either use libtool, and

specify the full pathname of the library, or use the `-LLIBDIR'

flag during linking and do at least one of the following:

- add LIBDIR to the `LD_LIBRARY_PATH' environment variable

during execution

- add LIBDIR to the `LD_RUN_PATH' environment variable

during linking

- use the `-Wl,-rpath -Wl,LIBDIR' linker flag

- have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for

more information, such as the ld(1) and ld.so(8) manual pages.

----------------------------------------------------------------------

/usr/bin/install -c -m 644 aprutil.exp /usr/local/apr/lib

/usr/bin/install -c -m 755 apu-config.out /usr/local/apr/bin/apu-1-config

[root@business apr-util-1.4.1]#

-------------------------------------------------------------------

3、安装 tomcat-native

1. # cd /usr/local/tomcat-6.0.33/bin

2. # tar zxvf tomcat-native.tar.gz

3. # cd tomcat-native-1.1.20-src/jni/native

4. # ./configure --with-apr=/usr/local/apr --with-java-home=/usr/java/jdk1.7.0

5. # make

6. # make install