Article: Knights Landing CPU Speculation
By: none (none.delete@this.none.com), November 26, 2013 10:18 am
Room: Moderated Discussions
Michael S (already5chosen.delete@this.yahoo.com) on November 26, 2013 9:06 am wrote:
> none (none.delete@this.none.com) on November 26, 2013 7:20 am wrote:
> > anon (anon.delete@this.anon.com) on November 26, 2013 6:53 am wrote:
> > > Eric (eric.kjellen.delete@this.gmail.com) on November 26, 2013 4:05 am wrote:
> > > > Linus Torvalds (torvalds.delete@this.linux-foundation.org) on November 25, 2013 12:29 pm wrote:
> > > > > And the old Atom really was pretty bad at some general-purpose stuff. That VR-zone link
> > > > > says KNL is 72 modified Silvermont cores, so it should be much better in that regard.
> > > > >
> > > > > Linus
> > > >
> > > > What I am mostly interested in is exactly how they are modified
> > > > with regard to vector processing. The Knights
> > > > Corner cores and those of its predecessors were basically P54C derivatives with an added 512-bit vector
> > > > unit (for 16 DP FMA flops per core and cycle) but as we
> > > > speculated in a different branch of the thread (what
> > > > is now "3-TFLOPS-DGEMM") 72 Silvermont cores with a single 512-bit vector unit will not be enough to give
> > > > the cited 3 DP peak TFLOPS at a reasonable clock frequency (they would have to run at 2.6 GHz).
> > >
> > > Why is 2.6GHz an unreasonable frequency?
> > >
> > > Intel's 14nm silvermont derivative is reported to have 2.7GHz clock.
> >
> > Try to put 72 of them along with 2 wide vector units and you'll see that doesn't seem
> > reasonable even on 14nm :-)
>
> Yes, judged by Avaton C2750, when running at max. frequency 72
> Silvermont cores alone, without VPUs, would eat over 150W.
> But why did you mention "2 wide vector units"? At 2.7 GHz one unit per core will do the job.
You're right. But current rumors point to Silvermont + dual VPU, so in that context
saying 14nm next gen Atom can reach 2.7 GHz kind of assumes these rumors are correct,
so 2 VPUs :-)
> none (none.delete@this.none.com) on November 26, 2013 7:20 am wrote:
> > anon (anon.delete@this.anon.com) on November 26, 2013 6:53 am wrote:
> > > Eric (eric.kjellen.delete@this.gmail.com) on November 26, 2013 4:05 am wrote:
> > > > Linus Torvalds (torvalds.delete@this.linux-foundation.org) on November 25, 2013 12:29 pm wrote:
> > > > > And the old Atom really was pretty bad at some general-purpose stuff. That VR-zone link
> > > > > says KNL is 72 modified Silvermont cores, so it should be much better in that regard.
> > > > >
> > > > > Linus
> > > >
> > > > What I am mostly interested in is exactly how they are modified
> > > > with regard to vector processing. The Knights
> > > > Corner cores and those of its predecessors were basically P54C derivatives with an added 512-bit vector
> > > > unit (for 16 DP FMA flops per core and cycle) but as we
> > > > speculated in a different branch of the thread (what
> > > > is now "3-TFLOPS-DGEMM") 72 Silvermont cores with a single 512-bit vector unit will not be enough to give
> > > > the cited 3 DP peak TFLOPS at a reasonable clock frequency (they would have to run at 2.6 GHz).
> > >
> > > Why is 2.6GHz an unreasonable frequency?
> > >
> > > Intel's 14nm silvermont derivative is reported to have 2.7GHz clock.
> >
> > Try to put 72 of them along with 2 wide vector units and you'll see that doesn't seem
> > reasonable even on 14nm :-)
>
> Yes, judged by Avaton C2750, when running at max. frequency 72
> Silvermont cores alone, without VPUs, would eat over 150W.
> But why did you mention "2 wide vector units"? At 2.7 GHz one unit per core will do the job.
You're right. But current rumors point to Silvermont + dual VPU, so in that context
saying 14nm next gen Atom can reach 2.7 GHz kind of assumes these rumors are correct,
so 2 VPUs :-)
Topic | Posted By | Date |
---|---|---|
Knights Landing CPU Speculation | David Kanter | 2013/11/18 03:03 AM |
Knights Landing CPU Speculation | none | 2013/11/18 03:59 AM |
Knights Landing CPU Speculation | Patrick Chase | 2013/11/23 04:18 PM |
Knights Landing CPU Speculation | 2013/11/26 02:20 AM | |
Over 2,000 mm^2 of eDRAM??? | Mark Roulo | 2013/11/26 10:28 AM |
Over 2,000 mm^2 of eDRAM??? | David Kanter | 2013/11/26 12:09 PM |
Over 2,000 mm^2 of eDRAM??? | Eric Bron | 2013/11/26 12:21 PM |
Over 2,000 mm^2 of eDRAM??? | tarlinian | 2013/11/26 12:50 PM |
Over 2,000 mm^2 of eDRAM??? | Eric Bron | 2013/11/26 02:07 PM |
Over 2,000 mm^2 of eDRAM??? | Eric Bron | 2013/11/26 02:09 PM |
Over 2,000 mm^2 of eDRAM??? | aaron spink | 2013/11/26 04:03 PM |
Over 2,000 mm^2 of eDRAM??? | Eric Bron | 2013/11/27 12:42 AM |
Over 2,000 mm^2 of eDRAM??? | aaron spink | 2013/11/27 11:31 AM |
Over 2,000 mm^2 of eDRAM??? | David Kanter | 2013/11/26 05:25 PM |
Over 2,000 mm^2 of eDRAM??? | tarlinian | 2013/11/26 08:01 PM |
Over 2,000 mm^2 of eDRAM??? | Eric | 2013/11/27 03:54 AM |
eDRAM is DRAM in a logic-oriented process | Paul A. Clayton | 2013/11/27 08:10 AM |
Knights Landing CPU Speculation | James | 2013/11/18 06:26 AM |
Knights Landing CPU Speculation | Michael S | 2013/11/18 03:57 PM |
Knights Landing CPU Speculation | Urban Novak | 2013/11/19 01:49 AM |
Knights Landing CPU Speculation | none | 2013/11/19 02:19 AM |
Knights Landing CPU Speculation | Eric | 2013/11/19 08:48 PM |
Total GPGPU/Xeon Phi market maybe ~ $500M/year ... | Mark Roulo | 2013/11/20 11:35 AM |
Knights Landing CPU Speculation | Wes Felter | 2013/11/19 01:06 PM |
Knights Landing CPU Speculation | Michael S | 2013/11/19 01:49 PM |
Knights Landing CPU Speculation | Eric | 2013/11/18 01:17 PM |
Knights Landing CPU Speculation | Daniel | 2013/11/19 03:28 AM |
Knights Landing CPU Speculation | Eric | 2013/11/19 08:36 PM |
HPC guys score FLOPS non-obviously | Mark Roulo | 2013/11/20 11:43 AM |
3-TFlops-DGEMM | Michael S | 2013/11/20 11:59 AM |
3-TFlops-DGEMM | Mark Roulo | 2013/11/20 01:22 PM |
3-TFlops-DGEMM | Daniel | 2013/11/20 02:04 PM |
3-TFlops-DGEMM | Eric | 2013/11/21 02:28 AM |
3-TFlops-DGEMM | Michael S | 2013/11/21 06:48 AM |
3-TFlops-DGEMM | RecessionCone | 2013/11/21 12:13 PM |
3-TFlops-DGEMM | Michael S | 2013/11/21 03:34 PM |
3-TFlops-DGEMM | Eric | 2013/11/22 03:10 AM |
3-TFlops-DGEMM | Michael S | 2013/11/22 05:41 AM |
A (not very sensible) alternative: FMADD + FADD | Paul A. Clayton | 2013/11/22 09:19 AM |
3-TFlops-DGEMM | Sylvain Collange | 2013/11/24 03:37 AM |
3-TFlops-DGEMM | Michael S | 2013/11/24 07:06 AM |
3-TFlops-DGEMM | Sylvain Collange | 2013/11/24 10:28 AM |
HPC guys score FLOPS non-obviously | Patrick Chase | 2013/11/23 03:58 PM |
Knights Landing CPU Speculation | Paul Caheny | 2013/11/18 02:25 PM |
Knights Landing CPU Speculation | Konrad Schwarz | 2013/11/19 01:24 AM |
Knights Landing CPU Speculation | Amiba Gelos | 2013/11/19 08:36 PM |
Knights Landing CPU Speculation | David Kanter | 2013/11/20 10:52 AM |
Knights Landing CPU Speculation | Linus Torvalds | 2013/11/21 03:12 PM |
Knights Landing CPU Speculation | Amiba Gelos | 2013/11/21 06:14 PM |
Knights Landing CPU Speculation | Patrick Chase | 2013/11/23 04:33 PM |
Knights Landing CPU Speculation | Linus Torvalds | 2013/11/25 12:29 PM |
Knights Landing CPU Speculation | Linus Torvalds | 2013/11/25 01:05 PM |
Knights Landing CPU Speculation | Patrick Chase | 2013/11/25 01:22 PM |
Knights Landing CPU Speculation | Linus Torvalds | 2013/11/26 11:11 AM |
Knights Landing CPU Speculation | Eric | 2013/11/26 04:05 AM |
Knights Landing CPU Speculation | Eric | 2013/11/26 04:15 AM |
Knights Landing CPU Speculation | none | 2013/11/26 04:33 AM |
Knights Landing CPU Speculation | Eric | 2013/11/26 07:30 PM |
Knights Landing CPU Speculation | Eric | 2013/11/26 07:34 PM |
What is MCDRAM? | anon | 2013/11/26 09:58 PM |
What is MCDRAM? | none | 2013/11/27 02:00 AM |
What is MCDRAM? | Klimax | 2013/11/27 03:19 AM |
Knights Landing CPU Speculation | Klimax | 2013/11/27 12:06 AM |
Knights Landing CPU Speculation | Klimax | 2013/11/27 12:05 AM |
Knights Landing CPU Speculation | anon | 2013/11/26 06:53 AM |
Knights Landing CPU Speculation | none | 2013/11/26 07:20 AM |
Knights Landing CPU Speculation | Michael S | 2013/11/26 09:06 AM |
Knights Landing CPU Speculation | none | 2013/11/26 10:18 AM |
Knights Landing CPU Speculation | Eric Bron | 2013/11/26 02:21 PM |
Knights Landing CPU Speculation | Eric Bron | 2013/11/26 02:27 PM |
Knights Landing CPU Speculation | none | 2013/11/26 03:26 PM |
Knights Landing CPU Speculation | anon | 2013/11/26 06:42 PM |
Knights Landing CPU Speculation | none | 2013/11/27 02:08 AM |
Knights Landing CPU Speculation | anon | 2013/11/27 02:50 AM |
Knights Landing CPU Speculation | none | 2013/11/27 02:58 AM |
Knights Landing CPU Speculation | Michael S | 2013/11/27 02:25 AM |
Knights Landing CPU Speculation | anon | 2013/11/27 03:32 AM |
Knights Landing CPU Speculation | Michael S | 2013/11/27 04:08 AM |
Knights Landing CPU Speculation | Chung Leong | 2013/11/27 02:28 AM |
Knights Landing CPU Speculation | Michael S | 2013/11/27 03:53 AM |
Knights Landing CPU Speculation | Chung Leong | 2013/11/27 02:03 PM |
BiG.LiTTLe for KNL? | Jeff K | 2013/11/22 07:17 AM |
BiG.LiTTLe for KNL? | Patrick Chase | 2013/11/23 03:54 PM |
BiG.LiTTLe for KNL? | Patrick Chase | 2013/11/23 04:01 PM |
Transactional memory | Patrick Chase | 2013/11/23 03:37 PM |
Transactional memory | Bhima | 2013/11/25 08:01 AM |
Transactional memory | Patrick Chase | 2013/11/25 12:52 PM |
Knights Landing CPU Speculation | Daniel | 2013/11/25 03:17 AM |
Knights Landing CPU Speculation | Klimax | 2013/11/25 04:12 AM |
Knights Landing CPU Speculation | none | 2013/11/25 05:05 AM |
Knights Landing CPU Speculation | Klimax | 2013/11/25 05:45 AM |
Knights Landing CPU Speculation | none | 2013/11/25 05:55 AM |
Knights Landing CPU Speculation | gmb | 2013/11/25 08:21 AM |