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161557104 story Dr. Craig Hunter is a mechanical/aerospace engineer with over 25 years of experience in software development. And now Dixie_Flatline (Slashdot reader #5,077) describes Hunter's latest experiment:
Craig Hunter has been running Computational Fluid Dynamics (CFD) benchmarks on Macs for years--he has results going back to 2010 with an Intel Xeon 5650, with the most recent being a 28-core Xeon W from 2019. He has this to say about why he thinks CFD benchmarks are a good test: "As shown above, we see a pretty typical trend where machines get less and less efficient as more and more cores join the computation. This happens because the computational work begins to saturate communications on the system as data and MPI instructions pass between the cores and memory, creating overhead. It's what makes parallel CFD computations such a great real world benchmark. Unlike simpler benchmarks that tend to make CPUs look good, the CFD benchmark stresses the entire system and shows us how things hold up as conditions become more and more challenging." The M1 Ultra surpasses the original chart with just 6 cores. He had to double the x- axis to fit the performance of the M1 He seems to be impressed.
We know from Apple's marketing materials that the M1 Ultra has an extremely high 800 gigabyte/s memory bandwidth and an even faster interface between the two M1 Max chips that make up the M1 Ultra. This leads to a level of performance scaling that I don't see on supercomputers.
