tomcat7.0性能优化-挑战极限完整版

0 测试结果 
参考精简版的空跑测试结论 
http://phl.iteye.com/blog/1868206 

1 tomcat 
1.1 tomcat运行模式 
Connector/protocol 
org.apache.coyote.http11.Http11Protocol - blocking Java connector 
org.apache.coyote.http11.Http11NioProtocol - non blocking Java connector 
org.apache.coyote.http11.Http11AprProtocol - the APR/native connector. 

                       Java Blocking Connector   Java Non Blocking Connector   APR/native Connector 
                                 BIO                         NIO                       APR 
    Classname              Http11Protocol             Http11NioProtocol         Http11AprProtocol 
    Tomcat Version           3.x onwards                 6.x onwards              5.5.x onwards 
    Support Polling              NO                          YES                       YES 
    Polling Size                 N/A                   maxConnections             maxConnections 
    Read HTTP Request         Blocking                  Non Blocking                 Blocking 
    Read HTTP Body            Blocking                  Sim Blocking                 Blocking 
    Write HTTP Response       Blocking                  Sim Blocking                 Blocking 
    Wait for next Request     Blocking                  Non Blocking               Non Blocking 
    SSL Support               Java SSL                    Java SSL                   OpenSSL 
    SSL Handshake             Blocking                  Non blocking                 Blocking 
    Max Connections        maxConnections              maxConnections             maxConnections 

1.2 APR与tomcat-native安装 
到http://apr.apache.org/下载下面3个包 

apr-1.4.6.tar.gz 
apr-iconv-1.2.1.tar.gz 
apr-util-1.5.1.tar.gz 

1.安装apr 
./configure --prefix=/application/search/usr/apr/apr-1.4.6 
make -j16 
make install -j16 

2.安装apr-iconv 
./configure --prefix=/application/search/usr/apr-iconv/apr-iconv-1.2.1 --with-apr=/application/search/usr/apr/default 
make -j16 
make install -j16 

3.安装apr-util 
./configure --prefix=/application/search/usr/apr-util/apr-util-1.5.1 --with-apr=/application/search/usr/apr/default --with-apr-iconv=/application/search/usr/apr-iconv/default/bin/apriconv 
make -j16 
make install -j16 

4安装tomcat-native 
在tomcat目录下，找到bin/tomcat-native-1.1.24-src 
./configure --with-apr=/application/search/usr/apr/default --with-java-home=/application/search/usr/java/default 
make -j16 
make install -j16 

配置环境变量 
vi ~/.bashrc 
export LD_LIBRARY_PATH=/application/search/usr/apr/default/lib:/application/search/usr/tomcat-native/default/lib 
使环境变量生效 
source ~/.bashrc 
附加阅读 

---------------------------------------------------------------------- 
Libraries have been installed in: 
/application/search/usr/tomcat-native/tomcat-native-1.1.24/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. 
---------------------------------------------------------------------- 

1.3 优化配置 
官方参考文档 http://tomcat.apache.org/tomcat-7.0-doc/config/http.html 
为了提高安全性，一般情况下屏蔽 AJP 
注释或者删除server.xml中的 Connector节点 
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> 

启用NIO或者APR模式运行 
想运行在该模式下，直接修改server.xml里的Connector节点,修改protocol为 
<Connector port="80" protocol="org.apache.coyote.http11.Http11NioProtocol"   (或者Http11AprProtocol) 
connectionTimeout="20000" 
URIEncoding="UTF-8" 
useBodyEncodingForURI="true" 
enableLookups="false"  (是否反查域名) 
redirectPort="8443" /> 

根据经验，调整nio的线程池，参考http://tomcat.apache.org/tomcat-7.0-doc/config/http.html 

线程池参数，需要直接在connector节点配置。 
  <Connector port="8080" 
               protocol="org.apache.coyote.http11.Http11NioProtocol"  
               connectionTimeout="20000" 
               URIEncoding="UTF-8" 
               useBodyEncodingForURI="true" 
               maxThreads="768" 
               minSpareThreads="64" 
               enableLookups="false" 
               redirectPort="8443" /> 

调整内存 
JAVA_OPTS="-Xms1024m -Xmx1024" 

启用APR 
Apr要自己安装 
<Connector port="8081" 
               executor="tomcatThreadPool" 
               protocol="org.apache.coyote.http11.Http11AprProtocol" 
               connectionTimeout="20000" 
               URIEncoding="UTF-8" 
               useBodyEncodingForURI="true" 
               enableLookups="false" 
               redirectPort="8444" /> 

调整线程池 
<Connector port="8081" 
               executor="tomcatThreadPool" 
               protocol="org.apache.coyote.http11.Http11AprProtocol" 
               connectionTimeout="20000" 
               URIEncoding="UTF-8" 
               useBodyEncodingForURI="true" 
               enableLookups="false" 
               redirectPort="8444" /> 

<Executor name="tomcatThreadPool" 
namePrefix="catalina-exec-" 
maxThreads="1024" 
minSpareThreads="512" 
prestartminSpareThreads="true" /> 

注意：线程池设置在apr,nio模式下不生效（个人估计是个bug），查看manager页面，线程数还是200。因此需要将maxThreads，minSpareThreads直接设置在connector节点下 


2 经验总结 
首先要掌握未优化之前，服务器性能现状； 
设置虚拟机内存，性能提升明显； 
设置tomcat运行模式略微有提高； 
设置tomcat线程池，一般设置的比较大以免成为瓶颈； 
逐步递增的性能调试计划，从较少请求数，较低并发开始逐步递增。直到性能明显下降位置； 
以吞吐率、并发、响应时间等为关键性能指标； 
区分裸奔性能和分布式调用的性能； 
尽量覆盖全部代码运行，服务启动要为性能测试做特殊处理（callId,timeStamp）； 
做AB压力测试,可以编写个shell夜间运行并将结果重定向； 

3 widget的压力测试技术 
224网段有防火墙设置，所以先前的压力测试不够准确 
之后采取了搬迁物理服务器到防火墙外面 
做了相关的压力测试 
优化点如下： 
1 动态、静态分离部署 
2 将widget从2台扩充到8台物理服务器 
3 单台物理服务器，配置1台tomcat占用全部服务器资源性能  <  配置8台tomcat占用全部服务器资源性能，大概差4-5倍 

Linux命令查看CPU 
more /proc/cpuinfo 

主要查看物理cpu数，线程数 
processor      逻辑处理器的id。 
physical id    物理封装的处理器的id。 
core id        每个核心的id。 
cpu cores      位于相同物理封装的处理器中的内核数量。 
siblings       位于相同物理封装的处理器中的逻辑处理器的数量。 

 

 

Apache-Bench工具介绍 
Apache HTTP服务器已经带了一个测试工具: ab 

一般把apache压力测试称为AB测试. ab工具的位置在apache2的bin目录里为什么用这个工具 

l  支持命令行执行，可以在linux行运行 
l  简单，实用 
l  应用广泛 

1.1.1    输入参数 
常用的命令如下: 
./ab -n 请求次数 -c 并发数 地址 

参数名 参数含义 
-n 请求数 
-c 并发数 

windows下，地址要用双引号 
linux下，地址用单引号 

1.1.2    输出报表 
字段名字 中文解释 
Server Software 被测试的Web服务器软件名称 
Server Hostname 请求的URL中的主机部分名称 
Server Port 被测试的WEB服务器的监听端口 
Document Path URL中的相对路径 
Document Length http响应数据的正文长度 
Concurrency Level 并发用户数(-c) 
Time taken for tests 所有请求被处理完所花费的总时间 
Complete requests 总请求数(-n) 
Failed requests 失败请求数 
Total transferred 所有请求的响应数据长度和，包括头和正文 
HTML transferred 所有请求的响应数据中，正文数据的和 
Requests per second 吞吐率 
Time per request 用户平均请求等待时间 = time taken for tests / (complete requests / concurrency level) 
Time per request: 服务器平均请求处理时间 = 吞吐率的倒数 = time per request / concurrency level 
Transfer rate 请求在单位时间内，从服务器获的数据长度 
Percentage of the requests served within a certain time (ms) 请求处理时间的分布情况 

参考资料 
http://www.cnblogs.com/jackei/archive/2006/07/18/454144.html  apache-ab 
http://wenku.baidu.com/view/3fe17e1bc5da50e2524d7fb9.html apache-ab 
http://phl.iteye.com/blog/910984  apr安装 
http://phl.iteye.com/blog/910996  tomcat运行模式 
http://phl.iteye.com/admin/blogs/1561604 proc/cpuinfo的概念 
http://tomcat.apache.org/tomcat-7.0-doc/config/executor.html  tomcat线程池配置 
http://tomcat.apache.org/tomcat-7.0-doc/config/http.html  tomcat protocol 
http://city-moon.iteye.com/blog/578282  Tomcat 6 支持 NIO -- Tomcat的四种基于HTTP协议的Connector性能比较