Intel announces Xeon W-3175X 28 core monster cpu

[ewmayer]

Originally Posted by henryzz

Surely knight's landing has an advantage?

Perhaps in terms of total throughput per $, compared to this kind of high-pricy server gear. (Though a barebones multi-node system as featured in "George's Dream Build" will likely still beat that in terms of FLOPS/$.) Typical KNL can probably be got for appreciably less than the $5000 those of us around here paid for the "GIMPS KNL" a few years back when KNL first hit the market. The thing about KNL, it has a lot of cores (64-72, depending on model), but each core is fairly low-throughput due to the undervolting/clocking needed to keep temperatures reasonable. So you need all the cores to compete with a high-end 16-or-more-core SkylakeX system, but it's more or less impossible to split an LL test across that many cores without the manythread-sync overhead killing total throughput. The sweet spot is multiple workers, each using (say) 8 cores.

OTOH for the work I use the KNL for, large Fermat number testing, the FFT lengths are sufficiently large (currently running F30 using 64Mdoubles) that one *can* make effective use of all those cores, since the size of the typical work chunk a thread does before needing to sync with the other threads is proportionally larger.

[Mark Rose]

Originally Posted by ewmayer

The sweet spot is multiple workers, each using (say) 8 cores.

I don't know if this is true with mprime, due to cache contention. In the benchmarking I've done, it's always been better to run a single worker per chip/chiplet or many single-core workers. But there is a sweet spot for the number of cores per chip/chiplet, as you say.

[pinhodecarlos]

I suppose this CPU will handle games like solitaire.

[GP2]

Originally Posted by pinhodecarlos

I suppose this CPU will handle games like solitaire.

Rumor says it will even handle multi-player Solitaire battle royale.

[PhilF]

Originally Posted by GP2

Rumor says it will even handle multi-player Solitaire battle royale.

I'm down with it, as long as it can handle those old MS-DOS games like Star Fleet I and MS Space Simulator.