[kaffe] Status of boehm-gc vs. kaffe-gc?

Guilhem Lavaux guilhem at kaffe.org
Thu Sep 22 13:20:34 PDT 2005

Hi Gwenole,

I have just fixed an important bug in the GC on AMD64. GC was freeing 
used memory on it and now the stack is walked correctly. However, I have 
noticed there is still SMP oddities sometimes.


Guilhem Lavaux.

Gwenole Beauchesne wrote:
> Hi,
> Dalibor told me you'd know more precisely the status of boehm-gc vs.  
> kaffe-gc. I am asking because on x86_64 (gcc 4.0-branch, glibc 2.3.5), I
> sometimes get failures in the testsuite where all threads are waiting for
> something. This is with the default kaffe-gc. What's more, this cannot
> be repeatedly reproduced, unfortunately. i.e. on next runs, the tests can
> pass.
> With boehm-gc, all tests but one (ClassGC) pass on x86_64. This one either
> fails with a hang (all threads blocked) or an assert() failure, etc. I
> believe there are some 64-bit bugs left in the common GC parts. FWIW, the
> latest Kaffe that passed all tests on x86_64 was 1.1.4.
> BTW, I also merged from GCC 4.0.2 boehm-gc for testing with no 
> improvement.
> Anyone with another 64-bit platform to compare results?
> Debugging that with gdb is somewhat head-scratching stuff and I have yet 
> to find out the root cause. If anyone has an idea, he is welcome.
> Thanks,
> Gwenolé.
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