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    <p>Seems like java is just using more <em>virtual</em> memory.</p> <pre><code>USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND amwise 20598 0.0 0.5 22052 5624 pts/3 Sl+ 14:59 0:00 mono Test.exe amwise 20601 0.0 0.7 214312 7284 pts/2 Sl+ 15:00 0:00 java Program </code></pre> <p>I made a test program in C# and in Java that print the string "test" and waits for input. I believe that the resident set size (RSS) value more accurately shows the memory usage. The virtual memory useage (VSZ) is less meaningful.</p> <p>As I understand it applications can reserve a ton of virtual memory without actually using any real memory. For example you can ask the <a href="http://msdn.microsoft.com/en-us/library/aa366887.aspx" rel="nofollow noreferrer">VirtualAlloc</a> function on Windows to either reserve or commit virtual memory.</p> <p>EDIT:</p> <p>Here is a pretty picture from my windows box: <a href="http://awise.us/images/mem.png" rel="nofollow noreferrer">alt text http://awise.us/images/mem.png</a></p> <p>Each app was a simple printf followed by a getchar. Lots of virtual memory usage by Java and CLR. The C version depends on just about nothing, so it's memory usage is tiny relatively. </p> <p>I doubt it really matters either way. Just pick whichever platform you are more familiar with and then don't write terrible, memory-wasting code. I'm sure it will work out.</p> <p>EDIT:</p> <p>This <a href="http://technet.microsoft.com/en-us/sysinternals/dd535533.aspx" rel="nofollow noreferrer">VMMap tool</a> from Microsoft might be useful in figureing out where memory is going.</p>
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    1. POjvm design decision
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    1. CORSS of an idle process isn't a great measure either.
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      1. USTom Hawtin - tackline
    2. COI'm not trying to decide which platform is better for me to use. I'm curious why they made the design decision they did on the jvm side, and what they gained from it.
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    3. COAll memory usage in a process space is virtual (at least in windows). On a 32bit OS the address space is divided into 2GB Code and 2GB data. Total Private bytes refers to the amount allocated in the data address space of the application. The OS manages how this allocation relates to physical memory.
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