[Beowulf] Mixing 32-bit compute nodes with 64-bit head nodes
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Greg Lindahl lindahl at pathscale.comThu May 11 12:03:36 PDT 2006
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On Thu, May 11, 2006 at 02:01:09PM -0400, Mark Hahn wrote: > I don't know whether there's any way to use the extra registers > without paying the cost of all addrs going to 64b. I suspect this > could be made to work, but would be painful, ABI-wise. It's certainly possible to have an n32 mode a-la MIPS, but then you have to have 3 copies of all your libraries, when 2 were confusing enough. The Intel compiler has a funny mode in which it tries to implement ILP32 but extend pointers and longs when making system calls or calls to 64-bit libraries. It looks like an overly-heroic attempt to improve SPECint to me. -- greg
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