Manycores vs multicores

By: juanrga (nospam.delete@this.juanrga.com), January 10, 2015 4:10 pm
Room: Moderated Discussions
Michael S (already5chosen.delete@this.yahoo.com) on January 7, 2015 8:27 am wrote:
> juanrga (nospam.delete@this.juanrga.com) on January 7, 2015 5:47 am wrote:
> > Michael S (already5chosen.delete@this.yahoo.com) on January 3, 2015 1:30 pm wrote:
> > > juanrga (nospam.delete@this.juanrga.com) on January 3, 2015 1:11 pm wrote:
> > > > Michael S (already5chosen.delete@this.yahoo.com) on January 3, 2015 12:36 pm wrote:
> > > > > juanrga (nospam.delete@this.juanrga.com) on January 3, 2015 12:02 pm wrote:
> > > > > > Eric Bron nli (eric.bron.delete@this.zvisuel.com) on January 2, 2015 2:28 pm wrote:
> > > > > > > > I still recall when he pretended that Intel had abandoned manycores with the new Xeon
> > > > > > > > Phi
> > > > > > >
> > > > > > > link ?
> > > > > >
> > > > > > http://www.realworldtech.com/forum/?threadid=143796&curpostid=143824
> > > > >
> > > > > So, Linus said that KNL is multicore called manycore fore marketing purpose. Where is he wrong?
> > > > >
> > > >
> > > > On that KNL is a manycore not a multicore.
> > >
> > > KNL cores are relatively big and fully cache-coherent to each other.
> > > To me it sounds much more like multicore than manycore.
> > > The only manycore-like feature is the absence of on-chip LLC.
> >
> > Big and small are relative terms, but KNL cores are smaller than Skylake cores.
> >
> > Cache-(in)coherence and on-chip LLC don't characterize the difference between many- and multicores.
> >
> > > Anyway, in the absence of consensus definitions of manycore
> > > and multicore we can argue about it ad infinitum.
> >
> > The differences between a Nvidia GPGPU and a Power8 CPU
>
> And then you replace Power8 in your statement by Oracle SPARC-M7. Is difference still obvious?

The differences between Nvidia GPGPU (manycore) and Power8 (multicore) remain. Of course, you can find processors between both extremes.

> > or between an Xeon
> > Phi and a Skylake Xeon are real, we don't need any consensus to get that.
> >
>
> Indeed, ultra-high-end NVidea GPGPUs do have few dozens of blocks that could be reasonably
> called "cores" (I consider Maxwell SMM to be equivalent of quad-core CPU module). And
> indeed few dozens *are* many. So I agree to call them manycore. However I don't think
> that you'll find many people like me that would agree to call them "manycore".

They can call it "X" if they want, but doesn't change anything important.

> As to KNL and Linus, he said that KNL is "more multicore"="less manycore"
> than it's direct predecessor KNC. It's hard to argue against it.

He said exactly "Intel Phi is going away from manycore", which is untrue. As chief architect of KNL mentions "Knights Landing will be the first true many-core processor to address today's memory and I/O performance challenges".

> But I'd guess that was not even his prime point. His prime point was that neither KNC
> nor KNL represents any sort of "future" for general-purpose computers. KNL, may be,
> makes less bad general-purpose computer than KNC, but on absolute scale of usefulness
> for anything except a narrow number-crunching niche, even KNL is horrible.

KNC/KNL are for very specific applications and don't represents future general-purpose manycores.
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  limited ordernksingh2014/12/04 10:17 PM
    I didn't understand this either. (NT)Konrad Schwarz2014/12/04 10:32 PM
    limited orderdmcq2014/12/05 02:13 AM
    limited orderbakaneko2014/12/05 09:11 AM
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