How to make compiler do inline optimization in WTK?

Question

Hello:
I'm a freshman in WTK. I found that my project is running very slow, so I wrote the following test to find the time cost of function call. I found that in this test, it spent 94ms, 1076ms and 2016ms in simulator, for 0, 1, and 2 function calls in each cycle (300,000 times).
By this result, I think function call may be very expensive and may became the bottleneck of performance in my project.
public static runTest(){
        long i = 0;
        long j = 0;
        long begin = System.currentTimeMillis();
        int times = 300000;
        for (i = 0; i < times ; i++){
            j = j + i;
        long end = System.currentTimeMillis();
        System.out.println("The result no call is " + (end - begin) );
        begin  = System.currentTimeMillis();
        for (i = 0; i < times ; i++){
            j += set(i);
        end =System.currentTimeMillis();
        System.out.println("The result 1 call is " + (end - begin) );
        begin  = System.currentTimeMillis();
        for (i = 0; i < times ; i++){
            j += set2(i);
        end = System.currentTimeMillis();
        System.out.println("The result 2 call is " + (end - begin) );
private static long set2(long i) {
     return set(i);
private static long set(long i) {
        return i;
}I work in eclipse ,and make sure i've checked "Inline finally blocks" check box.
I also run the same code in pc, and find the function call may have been optimized to "inline" by compiler (The times changed to 300,000,000, and result is 2016ms, 2281ms, and 2266ms), i also make sure changed the "compiler compliance level" to 1.3
In an ideal situation, the compiler can find "set(i)" is exactly "i" and change all"set(i)" to "i";
I wonder if the compiler can change some function to such "inline" in WTK. I don't know how compiler works in WTK, but as a freshman in WTK, i think there may have some optimization option i don't know. Can someone tell me how to make compile do this stuff?
Thx a lot!

Answer 1

...javac make something inline while WTK not...I doubt this. I think that code that was inlined by javac, will remain inlined when executed by WTK. You can check that in more details at compiler forum if needed. Javac remains the same, inlines are there - I don't think this changes.
What WTK probably can (and maybe even should) change is *hotspot* optimization settings when it emulates execution of MIDlets by real device.
As for your problem, could it be described as follows: MIDlets run slower than you'd expect of a typical desktop Java applications?
If yes then WTK User Guide seem to have an explanation for that: +"...Compared to the desktop-based emulator, a real MIDP device usually has a slower processor, less memory, and a slower network connection, and might have a different type of display. The Sun Java Wireless Toolkit for CLDC enables you to simulate the constrained environment of a real device..."+ (quoted from chapter Adjusting Emulator Performance). To me this reads like WTK forces Java machine to slow down execution of MIDlets in order to make it feel closer to a typical mobile device.