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Date: Mon, 03 Nov 2008 15:04:00 -0000
From: Andrew Haley <aph@redhat.com>
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To: ffileppo <ffileppo@libero.it>
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Subject: Re: [GCJ] Performance of GUI applications on embedded systems
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Andrew Haley wrote:
> ffileppo wrote:
>>>> oprofile is your friend.  If you can get oprofile working on your
>>>> target system, please use it and find out if it does what you need.
>>> I did it.  The answer is appended.
>>>
>>> The problem is that the program is spending almost all of the time
>>> generating stack traces, millions and millions of them.
>>>
> 
>> Hi Andrew,
>> thanks a lot for your help.
>>
>> Do you have any ideas to fix this problem?
> 
> 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.

Now,

163269   22.8358  libgcj.so.10.0.0         libgcj.so.10.0.0         _Jv_platform_gettimeofday()

calls to _Jv_platform_gettimeofday() are almost a quarter (!) of the
total runtime.

I think that's your fault.  Change your Timer.startTime to
something a little less aggressive.  :-)

Andrew.