Re: Gcj binaries performance (arm-linux)

Andrew John Hughes wrote:
> 2008/4/29 ffileppo <[email protected]>:
>>  >
>>  > aph@debian:~$  /home/aph/gcc-4.3.0-RC-20080301-install/bin/gcj MyPanel.class -O --main=MyPanel
>>  > aph@debian:~$ ./a.out
>>  > Test "Bubble Sort" (Num loop: 100)
>>  > First loop time: 22
>>  > Total time elapsed: 2197
>>  >
>>  > aph@debian:~$ /home/aph/gcc-4.3.0-RC-20080301-install/bin/gcj MyPanel.class -O2 --main=MyPanel
>>  > aph@debian:~$ ./a.out
>>  > Test "Bubble Sort" (Num loop: 100)
>>  > First loop time: 20
>>  > Total time elapsed: 1943

>>
>>  Thanks for your help Andrew,
>>  I'm getting good performance on target using -O / -O2

> 
> So does gcj default to no optimisation? This is what these results
> suggest, as the -O version is about 18 times quicker.

Yes, of course.  That's standard for UNIX, as far as I'm aware: I don't
think I've ever come across a compiler that optimized unless it was
asked to.

Andrew.