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  some fundamental questions about memory usage  (Read 1206 times)
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Offline Serethos

Junior Devvie

Java games rock!

« Posted 2004-09-10 12:30:45 »

im only experimenting a little with j2me. therefore ive taken the nokia 7210 emulator, which has nicely a memory usage monitor tool integrated.

so i made a little experiment, just for getting a feeling in the memory management:
i just created a very basic midlet with a canvas, doing absolute nothing and watched the memory usage:

size : 215040
used :  21456
free : 193584

then i tried to compare this result to the same midlet expect adding a class-global int-var:

used : 21500

--> ??
shouldnt the default-value of the heap-used-value be only increased by the value of an int-var (4bytes) ?

another example with 2 int-vars:

int 2x
used : 21528  

--> Huh this tiime i expected to get the difference between the default-memory usage and the one with one int-var twice ... but it isnt...

what do i get wrong ?
Offline Matzon

JGO Knight

Medals: 19
Projects: 1

I'm gonna wring your pants!

« Reply #1 - Posted 2004-09-13 05:10:11 »

I don't think you can be *that* precise when measuring memory in a VM. The phone may or may not have released an object for garbage collection when measuring.

Offline shmoove

Junior Devvie


« Reply #2 - Posted 2004-09-13 05:37:27 »

Chances are it's just the classloader creating some garbage when loading your classes.

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