响应时间设置太小，导致jmeter读取超时

Question

response time设置太小后，查看result tree，显示read time out，但也不是全部失败，有的不显示read time out。服务器返回结果没有问题。应该是jmeter的问题，请帮我分析一下

jmeter 日志：

2022-03-01 15:25:22,959 DEBUG o.a.j.p.h.s.HTTPHC4Impl: Sent 314 bytes
2022-03-01 15:25:23,011 DEBUG o.a.j.p.h.s.HTTPHC4Impl: IOException
java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method) ~[?:1.8.0_131]
    at java.net.SocketInputStream.socketRead(Unknown Source) ~[?:1.8.0_131]
    at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_131]
    at java.net.SocketInputStream.read(Unknown Source) ~[?:1.8.0_131]
    at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:280) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) ~[httpcore-4.4.13.jar:4.4.13]
    at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) ~[httpclient-4.5.13.jar:4.5.13]
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:935) ~[ApacheJMeter_http.jar:5.4.3-SNAPSHOT]
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:646) [ApacheJMeter_http.jar:5.4.3-SNAPSHOT]
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:66) [ApacheJMeter_http.jar:5.4.3-SNAPSHOT]
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1296) [ApacheJMeter_http.jar:5.4.3-SNAPSHOT]
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1285) [ApacheJMeter_http.jar:5.4.3-SNAPSHOT]
    at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:638) [ApacheJMeter_core.jar:5.4.3]
    at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:558) [ApacheJMeter_core.jar:5.4.3]
    at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:489) [ApacheJMeter_core.jar:5.4.3]
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:256) [ApacheJMeter_core.jar:5.4.3]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]

Answer 1

根据SocketTimeoutException描述：

Signals that a timeout has occurred on a socket read or accept.

您希望 JMeter 在 50 毫秒内获得响应 或更短时间，如果服务器未能在 50 毫秒内完全响应 - 您将收到此错误。

如果您绝对确定您的服务器会在 50 毫秒内做出响应，请注意还有 connect time and latency

根据JMeter Glossary：

Elapsed time. JMeter measures the elapsed time from just before sending the request to just after the last response has been received. JMeter does not include the time needed to render the response, nor does JMeter process any client code, for example Javascript.

所以涉及到以下操作：

JMeter 连接到服务器
JMeter 发送请求
服务器准备响应
服务器向服务器发送响应
JMeter 收到响应的第一个字节
JMeter 收到响应的最后一个字节

“响应超时”表示完整的 end-to-end 序列。

如果您不想看到此错误，请增加超时时间或使用 Duration Assertion，在这种情况下，JMeter 将等待完整响应到达，然后才会断言响应时间是否超过预期值

响应时间设置太小，导致jmeter读取超时

The response time is set too small, resulting in read time out in jmeter

jmeter