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PODifference between thread user time and thread cpu time in Java
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1001248
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2009-06-16T12:43:27.997
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2009-06-16T13:42:44.257
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2009-06-16T13:22:27.170
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Body
The ThreadMXBean has two methods for retrieving thread time usage: <ul> <li><a href="http://java.sun.com/javase/6/docs/api/java/lang/management/ThreadMXBean.html#getThreadUserTime%28long%29" rel="nofollow noreferrer">getThreadUserTime</a></li> <li><a href="http://java.sun.com/javase/6/docs/api/java/lang/management/ThreadMXBean.html#getThreadCpuTime%28long%29" rel="nofollow noreferrer">getThreadCpuTime</a></li> </ul> What is the difference between the two? <hr> Update 2: If I'm able to link to the javadocs, please don't quote them - I've read them already. Update: here's some code which I tried to use to learn what these times mean, with little success: <pre><code>ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean(); threadMXBean.setThreadContentionMonitoringEnabled(true); long mainThreadId = getMainThreadId(threadMXBean); logTimes("Start", threadMXBean, mainThreadId); URL url = new URL("https://hudson.dev.java.net"); URLConnection connection = url.openConnection(); connection.getContent(); logTimes("After loading", threadMXBean, mainThreadId); </code></pre> and the output is: <pre><code>Start Tue Jun 16 16:13:40 EEST 2009 Cpu time : 80, user time: 60, waited: 0, blocked: 0 After loading Tue Jun 16 16:13:43 EEST 2009 Cpu time : 1,020, user time: 960, waited: 0, blocked: 0 </code></pre> So the difference between cpu and user time increased from 20 to 60 milliseconds. Is that because using a HttpUrlConnection does include some network I/O?
Tags
<java><jmx>
Title
Difference between thread user time and thread cpu time in Java
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1. PO
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1. USRobert Munteanu
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1. USRobert Munteanu
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1. COI updated my post to include more info on what the values mean under WIN32.
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