[Beowulf] Intel Quad-Core or AMD Opteron
mcosta at fc.up.pt
mcosta at fc.up.pt
Fri Aug 24 07:25:21 PDT 2007
Citando Vincent Diepeveen <diep at xs4all.nl>:
> Even worse,
> Does SSE2 code of intel not by default in th eintel primitives have an 'if
> then else' that at opteron it runs without using SIMD?
We used ACML on Opterons and MKL on Xeons.
> But apart from that, SIMD at oldie K8 is very slow compared to core2,
> though not a factor 2. Barcelona for well optimized code should have an
> IPC in SIMD of up to 40+% faster i guess than core2.
> So only 2 questions are when they release and especially at *what* price
> for the 4 socket mainboards.
> A 16 core barcelona machine with 4 DDR2 memory controllers might be a very
> mighty system for all kind of applications that need shared memory to
> scale well.
> When releasing Barcelona core within a few months from now, AMD has a huge
> lead over intel with respect to 4 core cpu's, as it seems to me.
> I feel personally intels choice of CPU design using small tiny L1 caches
> from performance viewpoint is a catastrophic one. If there is just ONE
> competitor for an intel chip that manages to clock a cpu nearly at the
> same clock like intel and with the same number of cores, then intel
> usually gets totally outperformed. Now that intel & AMD produce
> cpu's at the same type of machines their cpu's, it seems to me
> that AMD will in general outperform intel.
> Comparing the 2006 core2 with a 2003 release is not a very fair
> compare IMHO.
We just compared what was available at the time, there's nothing more
we could do. I do think that AMD's architecture scales better, and
that eventually, as the number of cores and sockets increases, Intel
will switch to integrated memory controllers and some form of cpu to
> We can definitely conclude that intel managed to produce their new
> generation cpu ( core2) more than 1 year sooner than AMD did do, using a
> simple trick, namely glueing 2 dual core chips together.
That's right, and in that interval they managed to get ahead, for some
applications at least.
There is already a "true" quad-core in their roadmap, isn't there?
> In the meantime i keep wondering more and more about intel not having an
> equivalent on the market for AMD's hypertransport.
Yep. I do agree with everything you say, I just think that the
comparison between Xeon's and Opteron's for high performance computing
is getting harder, since before the em64t I would (and did) choose
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