Re: LuaJIT on BlueGene/Q
- From: Peter Colberg <peter@xxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 3 Oct 2012 10:42:09 -0400
On Wed, Oct 03, 2012 at 01:31:40PM +0200, steve donovan wrote:
> On Wed, Oct 3, 2012 at 12:05 PM, Mike Pall <mike-1210@xxxxxxxxxx> wrote:
> > PPC32/PPC64 mode from the beginning. AFAIR most binaries on these
> > systems are 32 bit -- there's no advantage in making them 64 bit.
>
> OK, as opposed to Intel 32 -> 64 where all those extra registers start
> really helping.
>
> Supercomputer nodes do not have oodles of RAM; everything is done with
> processes on separate nodes communicating with MPI (typically)
My experience with supercomputers is limited, but this seems the case.
This particular POWER7 system has 32× 4-way SMT cores per node, or 128
threads, and 128 GB main memory. That is 1 GB per MPI process, so it
would comfortably fit in the 32 bit address range.
The BlueGene/Q to be put into operation has 16× 4-way PowerPC A2 cores
per node, or 64 threads, and 16 GB memory, or 256 MB per MPI process.
Peter
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