jmeter给出错误没有可用的缓冲区空间（已达到最大连接数？）：connect

Question

Number of threads = 20 
Ramp-up period = 10 
Loop count = 200

一段时间后给出错误：

java.net.SocketException: No buffer space available (maximum connections reached?): connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    at java.net.Socket.connect(Socket.java:529)
    at java.net.Socket.connect(Socket.java:478)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:395)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:234)
    at sun.net.www.http.HttpClient.New(HttpClient.java:307)
    at sun.net.www.http.HttpClient.New(HttpClient.java:324)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)
    at org.apache.jmeter.protocol.http.sampler.HTTPJavaImpl.sample(HTTPJavaImpl.java:483)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:62)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1018)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1004)
    at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:411)
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:297)
    at java.lang.Thread.run(Thread.java:662)

Answer 1

似乎您的问题不是jmeter实例，而是os / env。

1. 通过以下链接查看建议：
   搜索java.net.SocketException：没有可用的缓冲区空间
   http://www.codeweblog.com/no-buffer-space-available/

2. 如果您想在诸如WinXP的操作系统上运行jmeter，请仔细阅读以下说明 。

Answer 2

可能是您没有关闭连接。 尝试更改采样器上的“保持活动”选项，但要记住检查来自真实浏览器的真实请求实际发送的内容（您不想掩盖潜在的问题）。 也可能是您的服务器未配置为关闭连接，这又可能是应用程序真正的问题。