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Re: Heap memory usage question
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Re: Heap memory usage question


  • Subject: Re: Heap memory usage question
  • From: Mike Schrag <email@hidden>
  • Date: Tue, 31 Aug 2010 10:50:19 -0400

I wouldn't let it worry you too much -- you can tell it's obviously just garbage, since it collects back down to a stable state consistently. JMX requires object creation, you probably have background threads doing things, etc. This isn't THAT big of a deal. If you're really curious, you can take a heap snapshot at the bottom and at the top and see what the difference is. JProfiler would help a lot here -- i find it pretty impossible to navigate jmap heap dumps.

ms

On Aug 31, 2010, at 10:44 AM, Pascal Robert wrote:

> Hello everyone,
>
> Two weeks ago, we started using Nagios to check and graph heap memory usage, and I see something strange : every 3 hours, heap usage goes from 30 MB down to 12 MB!  I also saw that behavior when using JConsole in preparation for my WOWODC presentation. In fact, heap usage goes up to 30 MB over the 3 hours, and goes down back to 12 MB. This app is doing nothing, the only requests coming in are the JMX queries, so I find it a bit strange that usage is growing.
>
> BTW, the hole in the graph is normal, Nagios is not pulling anything between 11pm and 4:30am.
>
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References: 
 >Heap memory usage question (From: Pascal Robert <email@hidden>)

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