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Why is the memory usage ZERO bytes of this program

 
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I always get 0 as the System Print

However if i increase the size of for loop it fetches me some bytes as the output.

Have been scratching my head since quite a time now

Any help would be appreciated.
 
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IntelliJ IDE Ruby
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Please UseCodeTags when posting code or configuration. Unformatted code and configuration is unnecessarily difficult to read.

You can edit your post by using the button.
 
Mustafa Garhi
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Thanks bro ..

It looks neater now .
 
David Newton
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It does :)

The numbers returned by these calls are approximate and don't necessarily reflect exact memory usage statistics (you'd probably need to use the JVM hooks for exact details). Use a higher number and you'll start seeing a difference at some point. *Which* point is likely JVM- and runtime-option dependent. For example, on my Ubuntu machine, I get a non-zero value if I change the count to 235, and that value stays constant again up until 788, at which point it more than doubles.
 
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