Hi Eric,
>> It turns out that this exhaustion of the 32-bit address space happens
>> due to a combination of three issues:
>>
>> * the SPARC pagesize of 8 kB,
>>
>> * ggc-page.cc's chunk size of 512 * pagesize, i.e. 4 MB, and
>>
>> * mmap adding two 8 kB unmapped red-zone pages to each mapping
>>
>> which result in the 4 MB mappings to actually consume 4.5 MB of address
>> space.
>>
>> To avoid this, this patch reduces the chunk size so it remains at 4 MB
>> even when combined with the red-zone pages, as recommended by mmap(2).
>
> Nice investigation! This size is a host parameter rather than a target one
> though, so config/sparc/sol2.h is probably not the most appropriate place to
> override it, but I personally do not mind.
ah, I tend to forget, not having built a cross compiler in ages. I'll
leave it as is for the moment, though, since there's no Solaris host
header ATM.
Thanks for the hint.
Rainer
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Rainer Orth, Center for Biotechnology, Bielefeld University
