we should be upto about EV12 by now... On Sun, Jun 20, 2021 at 1:38 PM John Hearns <hear...@gmail.com> wrote:
> Regarding benchmarking real world codes on AMD , every year Martyn Guest > presents a comprehensive set of benchmark studies to the UK Computing > Insights Conference. > I suggest a Sunday afternoon with the beverage of your choice is a good > time to settle down and take time to read these or watch the presentation. > > 2019 > > https://www.scd.stfc.ac.uk/SiteAssets/Pages/CIUK-2019-Presentations/Martyn_Guest.pdf > > > 2020 Video session > > https://ukri.zoom.us/rec/share/ajvsxdJ8RM1wzpJtnlcypw4OyrZ9J27nqsfAG7eW49Ehq_Z5igat_7gj21Ge8gWu.78Cd9I1DNIjVViPV?startTime=1607008552000 > > Skylake / Cascade Lake / AMD Rome > > The slides for 2020 do exist - as I remember all the slides from all talks > are grouped together, but I cannot find them. > Watch the video - it is an excellent presentation. > > > > > > > > > > > > > > > > > > > On Sat, 19 Jun 2021 at 16:49, Gerald Henriksen <ghenr...@gmail.com> wrote: > >> On Wed, 16 Jun 2021 13:15:40 -0400, you wrote: >> >> >The answer given, and I'm >> >not making this up, is that AMD listens to their users and gives the >> >users what they want, and right now they're not hearing any demand for >> >AVX512. >> > >> >Personally, I call BS on that one. I can't imagine anyone in the HPC >> >community saying "we'd like processors that offer only 1/2 the floating >> >point performance of Intel processors". >> >> I suspect that is marketing speak, which roughly translates to not >> that no one has asked for it, but rather requests haven't reached a >> threshold where the requests are viewed as significant enough. >> >> > Sure, AMD can offer more cores, >> >but with only AVX2, you'd need twice as many cores as Intel processors, >> >all other things being equal. >> >> But of course all other things aren't equal. >> >> AVX512 is a mess. >> >> Look at the Wikipedia page(*) and note that AVX512 means different >> things depending on the processor implementing it. >> >> So what does the poor software developer target? >> >> Or that it can for heat reasons cause CPU frequency reductions, >> meaning real world performance may not match theoritical - thus easier >> to just go with GPU's. >> >> The result is that most of the world is quite happily (at least for >> now) ignoring AVX512 and going with GPU's as necessary - particularly >> given the convenient libraries that Nvidia offers. >> >> > I compared a server with dual AMD EPYC >7H12 processors (128) >> > quad Intel Xeon 8268 >processors (96 cores). >> >> > From what I've heard, the AMD processors run much hotter than the Intel >> >processors, too, so I imagine a FLOPS/Watt comparison would be even less >> >favorable to AMD. >> >> Spec sheets would indicate AMD runs hotter, but then again you >> benchmarked twice as many Intel processors. >> >> So, per spec sheets for you processors above: >> >> AMD - 280W - 2 processors means system 560W >> Intel - 205W - 4 processors means system 820W >> >> (and then you also need to factor in purchase price). >> >> >An argument can be made that for calculations that lend themselves to >> >vectorization should be done on GPUs, instead of the main processors but >> >the last time I checked, GPU jobs are still memory is limited, and >> >moving data in and out of GPU memory can still take time, so I can see >> >situations where for large amounts of data using CPUs would be preferred >> >over GPUs. >> >> AMD's latest chips support PCI 4 while Intel is still stuck on PCI 3, >> which may or may not mean a difference. >> >> But what despite all of the above and the other replies, it is AMD who >> has been winning the HPC contracts of late, not Intel. >> >> * - https://en.wikipedia.org/wiki/Advanced_Vector_Extensions >> _______________________________________________ >> Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing >> To change your subscription (digest mode or unsubscribe) visit >> https://beowulf.org/cgi-bin/mailman/listinfo/beowulf >> > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > https://beowulf.org/cgi-bin/mailman/listinfo/beowulf > -- Dr Stuart Midgley sdm...@gmail.com
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