[Libre-soc-bugs] [Bug 1173] provide an option to switch ISACaller to use a different Mem class that uses mmap.mmap instead of a dict

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1173

--- Comment #7 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #6)
> (In reply to Luke Kenneth Casson Leighton from comment #5)
> > self.mem_blocks = {                                                         
> > File "/home/libresoc/src/openpower-isa/src/openpower/decoder/isa/mem.py",
> > line 318, in <dictcomp>                                                     
> > addr: mmap.mmap(-1, BLOCK_SIZE) for addr in block_addrs}
> > OverflowError: Python int too large to convert to C ssize_t
> > 
> > on an armv8l system
> 
> you need a 64-bit version of python. if you have a 32-bit python there isn't
> enough address space to easily emulate 64-bit powerpc

this is not the only reason you need 64-bit python, the main pytest process
often needs >4GiB ram in my experience when running the openpower-isa tests

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