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garbage collection

william kane
Ranch Hand

Joined: Nov 21, 2000
Posts: 260
What do Runtime.getRuntime().totalMemory() and
Runtime.getRuntime().freeMemory() return?
When i create new objects i expect the freeMemory to reduce and totalMemory to increase, but, the the totalMemory is remaining constant.
is my expectaion right?


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Steve Deadsea
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Joined: Dec 03, 2001
Posts: 125
freeMemory + usedMemory = totalMemory
Michael Ernest
High Plains Drifter
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Joined: Oct 25, 2000
Posts: 7292

Steve is right, totalMemory is a constant. It's configurable at initialization time, and that's it. "used memory" is the value you expect to increase with object creation.


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Jim Yingst
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Joined: Jan 30, 2000
Posts: 18671
Nope. Steve's equation is right - but total memory is not a constant.

Total memory refers to the total heap size currently allocated to the JVM. This can and does change over time , if the application attempts to use more memory, and the JVM has not yet used its allowed maximum. That's why there's a difference between the -ms and -mx options when invoking the JVM.
[ February 27, 2002: Message edited by: Jim Yingst ]

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