[GCJ] Performance of GUI applications on embedded systems

Thu Nov 6 16:40:00 GMT 2008

ffileppo wrote:
>> Here's one improvement. If you can get rid of the places in the GTK peers
>> where class and method lookups are performed at runtime you'll probably
>> have a fix. This shouldn't be a massive amount of work, just rather
>> boring.
>>>> In gcj,
>>>> * Compiled java code is quite fast.
>> * Class lookup by name is slow.
>> * Calling JNI code from compiled java code is quite fast.
>> * Calling compiled java code from JNI code is slow.
>> * Exceptions are slow.

> I'm testing your patch on my embedded system and now I can see that GUI performance are very much better (particularly during application startup).
>> Thank you so much!
>> However running my test case (please see my first post) I see that CPU usage is always at 100% (after the application is running),
> so the responsiveness is still not very good.

What do you expect? You're setting up a Timer with a delay of
0 milliseconds between events, and it's running continuously.
Andrew.