By: Eric (eric.kjellen.delete@this.gmail.com), August 3, 2012 7:59 am
Room: Moderated Discussions
EBFE (x.delete@this.y.com) on August 3, 2012 1:57 am wrote:
> David Kanter (dkanter.delete@this.realworldtech.com) on July 26, 2012 9:31 am
> wrote:
> > > > > What is the
> > > > >
> > > >
> currently best ratio of
> > GPU to
> > > CPU?
> > > >
> >
> > > That depends on your workload.
> > >
> > >
> > >
> > >
> > > > Will
> > > the best future design be a
> >
>
> > > > > BlueGene/Q (for best I/O) driving an
> > >
> >
> > > optimum
> > number of GPUs (for best Compute)?
> > > >
>
> > > > If you look at
> >
> > > the chart, it
> > >
> > should be clear that BGQ stands alone and
> > doesn't need
> > >
> GPUs. From a power
> > > > perspective, it's superior to
> > all
> existing GPUs - and
> > > it can run a far wider
> > > > range of
>
> > workloads.
> > > >
> > > > David
> > >
> > >
> BGQ is
> > > about the
> > same as 3GiB HD7970(947G/250W). So BGQ is
> quite likely to be inferior
> > > to
> > a 6GiB incoming-gen
> Firestream.
> > > [If I recall correctly, at launch time AMD
> >
> >
> > listed 7970 GPU/board power as 210/250]
> >
> > I expect that the next
>
> > generation of throughput processors (Knights Corner, Tahiti, Kepler) will
>
> > significantly alter the landscape because they represent a jump in
> >
> process.
> >
> > For AMD and Nvidia it is 40nm to 28nm, and for Intel it is
> the move
> > to 22nm.
> >
> > DK
> ow">
> http://vr-zone.com/articles/intel-xeon-phi-b0-stepping--the-knight-in-shin
> ing-armor-/16871.html
> (if not fake) Looks pretty bad: low freq, small ram, high
> tdp
> The number is so bad that I tend to think it's fake.
Why do you think that? Assuming that the top clock frequencies can actually be sustained, it's 8 DP FLOP (512-bit vector unit) * 2 (FMA?) * 60 * 1.09 GHz = 1.046 TFLOPS. That's in line with the 1 DP TFLOPS that Knights Corner was reported to clock in at in DGEMM/LINPACK. TDP and RAM look OK.
> David Kanter (dkanter.delete@this.realworldtech.com) on July 26, 2012 9:31 am
> wrote:
> > > > > What is the
> > > > >
> > > >
> currently best ratio of
> > GPU to
> > > CPU?
> > > >
> >
> > > That depends on your workload.
> > >
> > >
> > >
> > >
> > > > Will
> > > the best future design be a
> >
>
> > > > > BlueGene/Q (for best I/O) driving an
> > >
> >
> > > optimum
> > number of GPUs (for best Compute)?
> > > >
>
> > > > If you look at
> >
> > > the chart, it
> > >
> > should be clear that BGQ stands alone and
> > doesn't need
> > >
> GPUs. From a power
> > > > perspective, it's superior to
> > all
> existing GPUs - and
> > > it can run a far wider
> > > > range of
>
> > workloads.
> > > >
> > > > David
> > >
> > >
> BGQ is
> > > about the
> > same as 3GiB HD7970(947G/250W). So BGQ is
> quite likely to be inferior
> > > to
> > a 6GiB incoming-gen
> Firestream.
> > > [If I recall correctly, at launch time AMD
> >
> >
> > listed 7970 GPU/board power as 210/250]
> >
> > I expect that the next
>
> > generation of throughput processors (Knights Corner, Tahiti, Kepler) will
>
> > significantly alter the landscape because they represent a jump in
> >
> process.
> >
> > For AMD and Nvidia it is 40nm to 28nm, and for Intel it is
> the move
> > to 22nm.
> >
> > DK
> ow">
> http://vr-zone.com/articles/intel-xeon-phi-b0-stepping--the-knight-in-shin
> ing-armor-/16871.html
> (if not fake) Looks pretty bad: low freq, small ram, high
> tdp
> The number is so bad that I tend to think it's fake.
Why do you think that? Assuming that the top clock frequencies can actually be sustained, it's 8 DP FLOP (512-bit vector unit) * 2 (FMA?) * 60 * 1.09 GHz = 1.046 TFLOPS. That's in line with the 1 DP TFLOPS that Knights Corner was reported to clock in at in DGEMM/LINPACK. TDP and RAM look OK.
