转－tomcat io performance comparison with nio

最新推荐文章于 2021-05-20 15:10:09 发布

转载最新推荐文章于 2021-05-20 15:10:09 发布 · 6.4k 阅读

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本文通过实验对比了Tomcat使用NIO与传统IO处理动态页面和静态页面时的性能表现。结果显示，在处理动态资源时NIO的优势不明显，甚至不如传统IO；而在处理静态资源时NIO虽然不稳定但性能提升显著。

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原文见CodeWeblog.com 见中文

tomcat connector (conncector) can be configured way NIO IO and NIO today were nothing to do on the next test configuration is as follows:

<Connector port="8080" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" 
                           executor="tomcatThreadPool" />

<Connector port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol" 
               connectionTimeout="20000" 
               redirectPort="8443" />

Test two main resources:
Dynamic pages (with database queries, emphasis on IO and cpu) -- 动态页面（db查询，偏重消耗IO和CPU）
Static pages (no database operations, mainly on the ability to handle a simple request) -- 静态页面（没有DB操作，主要是处理简单的请求）

The results are as follows:
Dynamic Page

Concurrency   100 200 300 400 600 800
IO                  206 215 209 205 210 206
NIO               192 194 189 194 195 191

Static page

Concurrency   100 200 300 400 600 800
IO                  941 306 361 361 347 400
NIO                927 313 318 703 286 914

Can be seen in dealing with the advantages of dynamic resources NIO is not obvious or even not as good as IO, the main reason is a dynamic resource, IO, and cpu-intensive operations, resulting in many requests are blocked on the CPU and IO, it can only dry socket IO waiting, not to play the advantages of NIO

NIO look at the performance when dealing with static, although the unstable but still very significant performance improvements, so NIO often used to process the request and deal with them more than simple applications, such as memcached

－－看来，如果是比较耗CPU和IO的操作，tomcat即使在NIO的时候接收更大的并发，那么，顶多是进一步榨干机器的IO和CPU，还有可能将机器崩溃掉。因此，一定要参考CPU和IO的情况，有DB的话，也要参考DB机器的CPU和IO。这时候，估计还是增加更多的机器和应用，以此降低机器的负荷。

附：tomcat的官方文档上对集中connector的对比：

Below is a small chart that shows how the connectors differentiate.

              Java Blocking Connector       Java Nio Blocking Connector       APR Connector
Classname         Http11Protocol                  Http11NioProtocol         Http11AprProtocol
Tomcat Version   3.x 4.x 5.x 6.x                       6.x                     5.5.x 6.x
Support Polling         NO                             YES                        YES
Polling Size           N/A                   Unlimited - Restricted by mem    Unlimited - Configurable
Read HTTP Request     Blocking                     Non Blocking                   Blocking
Read HTTP Body        Blocking                     Sim Blocking                   Blocking
Write HTTP Response   Blocking                     Sim Blocking                   Blocking
SSL Support           Java SSL                     Java SSL                       OpenSSL
SSL Handshake         Blocking                     Non blocking                   Blocking
Max Connections       maxThreads                See polling size            See polling size