hello all, I just wrote a little JComboBox test and I ran into a problem that I can't explain (and I couldn't find information on it in the net after a quick search). Maybe I just missed something obvious. Here is the little program. It just adds a JComboBox to a JFrame. When I run this program the frame pops up, but it takes a while until the combo actually gets added. the print statements show that the method setVisible takes unusually long to return. I say, unusually as I never noticed this problem before. Could someone tell me what happens here?
wuhh... I am running this on linux, jdk 1.4.1-beta. I compiled it with a call to javac without setting any options. The output is: created frame - 825 created data store - 2 populated data store - 1 created combo - 308 combo added - 0 pack - 264 set visible - 5120 The really weird thing is, I am developing complex guis on this system and I never noticed this behaviour. compiling with g:none (debugging of) results in: created frame - 945 created data store - 1 populated data store - 1 created combo - 321 combo added - 1 pack - 273 set visible - 5133 that's even worse. What's happening? is this a parallel universe? Maybe I should sacrifice some profiler evaluation copy to see what's going on?!
just compiled and ran the program on different jdks: 1.4.0 and 1.4.1 doesn't defer much, but the result of jdk 1.3 (IBM jit-enabled) is: created frame - 1009 created data store - 2 populated data store - 0 created combo - 778 combo added - 1 pack - 52 set visible - 323 jdk 1.3.1_04: ( haven't seen this error output (Font...) for a long time ;-) ) Font specified in font.properties not found [--symbol-medium-r-normal--*-%d-*-*-p-*-adobe-fontspecific] created frame - 2219 created data store - 1 populated data store - 1 created combo - 470 combo added - 1 pack - 145 set visible - 5021 just to throw some more benchmarks at you: the combobox is not the problem. adding a JTextField instead of a JComboBox doesn't make it faster: created frame - 903 created text field - 176 text field added - 1 pack - 230 set visible - 5029 any ideas, comments, experiences? I'm definitely interested. is this really a linux problem?
Sorry for not mentioning this in my earlier post...
The system I am running it on is a Pentium 4 1.8Ghz with Windows2K with JDK 1.3.1_01 (my machine at work... )
I'll try this out on my (much slower) machines at home and see what the numbers work out to...
I'm betting that most of the "native-peer" stuff gets set up in the setVisible() call, so that may behave different ways on different systems depending on the native resources being called... so there may be a speed difference between Windows and Linux implementations of the "native-peer" JDK code...
Anyone else out there have any numbers from running this?
Write once, run anywhere, because there's nowhere to hide! - /. A.C.
I paid more attention on how long my bigger apps take to come up. for example do I have a splash screen composed of a jframe and an image where the jframe pops up first and only after some moments the image is displayed. so, obiously it's the jdk for linux. Although I have only (compared to you machine) 500Hz CPU, I don't (want to) think it's a CPU problem. 500Hz should be more than enough to process this little window!