[Beowulf] FTC and Intel
h-bugge at online.no
Mon Dec 21 01:05:08 PST 2009
On Dec 19, 2009, at 22:20 , Peter St. John wrote:
> What I saw (in a recent Slashdot, which I ought to be able to find)
> was the idea that an Intel compiler disables it's own highest levels
> of optimizations if it detects that the host processor is not Intel.
> The complaint is based on that I believe.
> FWIW, I imagine that if an automobile engine detected poor octane in
> the fuel, it might throttle down the maximum speed of the car; but
> if it did so after detecting a competitor's brand of gasoline, it
> could be considered anti-competitive. But of course IMNAL or however
> we announce we ain't lawyers so CGS (cum grano salis).
Intel's compiler generates code that will not run on AMD CPUs (i.e.
non GenuineIntel) if an instruction-set higher than SSE2 is selected.
This issue is covered by the referenced complaints elsewhere. I know
this issue pretty well, as I wrote a piece of software used by Scali/
Platform MPI which reverted the Intel compiler's check for
GenuineIntel, which transparently allowed MPI programs to run on AMD
CPUs with SSE3/SSSE3 instruction set enabled.
Claim 20 in the complaints is not related to this, but
_interoperability_ between GPUs and Intel CPUs. That is what I tried
to get a better understanding of. I have received insightful comments
around this issue off-list.
Thanks anyway, Håkon
> On Thu, Dec 17, 2009 at 3:33 AM, Håkon Bugge <h-bugge at online.no>
> In http://www.ftc.gov/os/adjpro/d9341/091216intelcmpt.pdf, there are
> allegations against Intel, such as "20. Intel’s efforts to deny
> interoperability between competitors’ (e.g., Nvidia, AMD, and Via)
> GPUs and Intel’s newest CPUs".
> I was unaware of this. Anyone know what kind of interoperability we
> are talking about here?
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h-bugge at online.no
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