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Posted by / 19-Jan-2018 03:17

On the other hand, the Client VM will have a greater tendency to flush soft references rather than grow the heap.

The behavior described above is true for 1.3.1 through Java SE 6 versions of the Java Hot Spot VMs.

The Java Hotspot Client VM uses the current heap size to calculate the free space.

This means that the general tendency is for the Server VM to grow the heap rather than flush soft references, and therefore has a significant effect on when soft references are garbage collected.

For more in-depth troubleshooting discussion beyond the scope of this FAQ, please see the Java Trouble-Shooting and Diagnostic Guide I can't get profiling to work, what should I do?

First, make sure you are running with -agentlib:hprof and try -agentlib:hprof=help to see the different kinds of profiling available.

This uses the incremental garbage collection algorithm, which attempts to collect a fraction of the heap instead of the entire thing at once.

As of Java SE 6, the Windows /3GB feature is not supported. Pooling objects will cause them to live longer than necessary.

If your application requires a very large heap you should use a 64-bit VM on a version of the operating system that supports 64-bit applications. The garbage collection methods will be much more efficient if you let it do the memory management. Don't call System.gc(), Hot Spot will make the determination of when its appropriate and will generally do a much better job.

When this happens, the VM will exit after printing a message similar to the following.

For more information, see the evaluation section of bug 4697804. The maximum theoretical heap limit for the 32-bit JVM is 4G.

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A larger heap will cause garbage collection pauses to increase because there is more heap to scan. For some applications a very large eden helps, for others it will increase the times of minor collections.

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