亲们，你们的tomcat并发能到多少？

摘要: 麻，再改进一下，估计最多能到2000多，曾听某网友说，调优后的tomcat项目能到3000，不知道是怎么做的。。。 哪位亲给说说。。。

配置：Intel Xeon E5 2.4G*6核，16G内存,Redhat Linux X64，jdk 7(server),tomcat 8.9

改了tomcat 内存配置，开启了nio+epoll，结果仍不好看。。。

vi bin/catalina.sh

CATALINA_OPTS='-Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.EPollSelectorProvider'JAVA_OPTS= -Xms800M -Xmx1500M -XX:PermSize=128M -XX:MaxPermSize=300M

vi conf/server.xml

<Connector port="7080" protocol="org.apache.coyote.http11.Http11NioProtocol"               connectionTimeout="20000"               redirectPort="7443"                acceptorThreadCount="6"               acceptCount="800"               maxThreads="400"               compression="on"               compressionMinSize="2048"               noCompressionUserAgents="gozilla,traviata"                compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"/>

采用jfinal+beetl模板，apache ab压力测试结果：

D:\tools\Apache2.2\bin>ab -n 1000 -c 50 http://192.168.xx.xxx:7080/jfinalBeetlThis is ApacheBench, Version 2.3 <$Revision: 655654 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking 192.168.xx.xxx (be patient)Completed 100 requestsCompleted 200 requestsCompleted 300 requestsCompleted 400 requestsCompleted 500 requestsCompleted 600 requestsCompleted 700 requestsCompleted 800 requestsCompleted 900 requestsCompleted 1000 requestsFinished 1000 requestsServer Software:        Apache-Coyote/1.1Server Hostname:        192.168.xx.xxxServer Port:            7080Document Path:          /jfinalBeetlDocument Length:        327 bytesConcurrency Level:      50Time taken for tests:   0.656 secondsComplete requests:      1000Failed requests:        0Write errors:           0Non-2xx responses:      1000Total transferred:      146000 bytesHTML transferred:       0 bytesRequests per second:    1523.81 [#/sec] (mean)Time per request:       32.813 [ms] (mean)Time per request:       0.656 [ms] (mean, across all concurrent requests)Transfer rate:          217.26 [Kbytes/sec] receivedConnection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   2.6      0      16Processing:     0   32   6.3     31      47Waiting:        0   20  11.2     16      47Total:          0   32   6.4     31      47Percentage of the requests served within a certain time (ms)  50%     31  66%     31  75%     31  80%     31  90%     47  95%     47  98%     47  99%     47 100%     47 (longest request)

未采用beetl，apache ab测试结果：

D:\tools\Apache2.2\bin>ab -n 1000 -c 50 http://192.168.xx.xxx:7080/RootThis is ApacheBench, Version 2.3 <$Revision: 655654 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking 192.168.xx.xxx (be patient)Completed 100 requestsCompleted 200 requestsCompleted 300 requestsCompleted 400 requestsCompleted 500 requestsCompleted 600 requestsCompleted 700 requestsCompleted 800 requestsCompleted 900 requestsCompleted 1000 requestsFinished 1000 requestsServer Software:        Apache-Coyote/1.1Server Hostname:        192.168.xx.xxxServer Port:            7080Document Path:          /RootDocument Length:        11430 bytesConcurrency Level:      50Time taken for tests:   1.297 secondsComplete requests:      1000Failed requests:        0Write errors:           0Total transferred:      11571000 bytesHTML transferred:       11430000 bytesRequests per second:    771.08 [#/sec] (mean)Time per request:       64.844 [ms] (mean)Time per request:       1.297 [ms] (mean, across all concurrent requests)Transfer rate:          8713.10 [Kbytes/sec] receivedConnection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    1   4.1      0      16Processing:    16   62   9.7     63      94Waiting:        0   29  18.1     31      78Total:         16   63   9.5     63      94Percentage of the requests served within a certain time (ms)  50%     63  66%     63  75%     63  80%     63  90%     78  95%     78  98%     78  99%     78 100%     94 (longest request)

麻，再改进一下，估计能到2000多，曾听某网友说，调优后的tomcat项目能到3000，不知道是怎么做的。。。

哪位亲给说说。。。

以下由 明月照大江网友提供：

我看了一下，tomcat给的几个参数，你先别忙着上集群，试试这些，tomcat81.Executor 配置1.1 maxThreads ，默认是200，把这个设置这个数值，可以再高一些。400，800都试试。会有瓶颈。2.HTTP Connector 设置2.1 acceptCount 默认是100，调高，翻几倍试试2.2 acceptorThreadCount 默认是1，调成CPU线程数，比如4核心8线程，就调成8.2.3 maxThreads 默认是200，调高2.4 processorCache 如果使用servlet3.0，配置到和 maxThread 一样任何和缓冲区相关的配置都可以调大。JVM参数尽量调大，各代配合合适的内存回收算法。etc详见：http://tomcat.apache.org/tomcat-8.0-doc/config/http.html压缩选项之类的可以看着来，其他的比如可以把NIO2改成 APR。以上是根据官网给的配置信息  “利用丰富的想象力” 得来的答案，没有经过任何测试。先榨干一个tomcat，再上集群！

以下转自http://blog.csdn.net/lifetragedy/article/details/7708724：

Tomcat的优化分成两块：Tomcat启动命令行中的优化参数即JVM优化Tomcat容器自身参数的优化（这块很像ApacheHttp Server）catalina.shexport JAVA_OPTS=.....-server: 我不管你什么理由，只要你的tomcat是运行在生产环境中的，这个参数必须给我加上–Xmn: 设置年轻代大小为512m。整个堆大小=年轻代大小 + 年老代大小 + 持久代大小。持久代一般固定大小为64m，所以增大年轻代后，将会减小年老代大小。此值对系统性能影响较大，Sun官方推荐配置为整个堆的3/8。-Xss: 是指设定每个线程的堆栈大小。这个就要依据你的程序，看一个线程 大约需要占用多少内存，可能会有多少线程同时运行等。一般不易设置超过1M