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I run my Java application in Eclipse and see these two thing in Task Manager:

task manager - what eclipse does?

Before I start my application, Eclipse uses ~0% CPU. What exactly does Eclipse do after my program started?

If I run my application without Eclipse, will there be any difference in my Java process CPU usage in the case that my JVM settings are the same with Eclipse?

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    Eclipse has to read your program output to display it in the console, for example, which can take a bit of resource. So your application running outside Eclipse may go a bit faster. Commented Jun 30, 2015 at 15:28
  • If you are sure please make it an answer so I can accept it. Commented Jul 1, 2015 at 4:38

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Eclipse has to read your program output to display it in the console, for example, which can take a bit of resources, especially if your program generates lots of output and/or long lines of output (in my experience, the Eclipse console is quite slow). I suppose you're not running in debug mode, in which case Eclipse would have to do more to handle the debugging.

So your application running outside Eclipse may go a bit faster, yes.

You can of course run something like jvisualvm to get a thread dump of Eclipse while your program is running to find out exactly Eclipse is doing.

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