jmeter测试网站性能connection refused timeout

Question

我用Jmeter2.13测试网站一个http请求，服务器是tomcat7，测试500个线程数正常，增加到750就会出现connection refused错误，而且一般是最后的请求出现错误，前面仍是对的。试了网上一些方法增加tomcat7 server.xml最大线程数，修改系统参数等都不行。此时CPU内存带宽IO都是没有满的，所以不知瓶颈在何处？？希望有遇到过类似情况或者知道的人能解答，谢谢！
结果树中错误代码如下：

org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.0.160:8080 refused

at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:190)

at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)

at org.apache.jmeter.protocol.http.sampler.MeasuringConnectionManager$MeasuredConnection.open(MeasuringConnectionManager.java:107)

at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:643)

at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)

at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)

at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:517)

at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:331)

at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)

at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1146)

at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1135)

at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:434)

at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)

at java.lang.Thread.run(Unknown Source)

Caused by: java.net.ConnectException: Connection timed out: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)

Answer 1

我也碰到这个问题了……请高手出马解释解释，为我等解惑：（