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Yes. You'll essentially never see a 10% clockspeed boost result in 10% faster completion of a benchmark more sophisticated than dhrystone, because you're still
by Symmetry 4y ago
Yes. You'll essentially never see a 10% clockspeed boost result in 10% faster completion of a benchmark more sophisticated than dhrystone, because you're still limited by the speed of your memory.
- ajross 4y agoIt really depends on the benchmark. Lots of real-world tasks remain highly cache-bound. One important one for me personally is building software. I run big system builds for Zephyr test suites and Chromeos regularly on 64 core devices, and have access to systems with both 4-channel and 8-channel DRAM setups. The doubled memory bandwidth makes for only about 5% higher build throughput. Honestly I think a lot of modern benchmarkery has ended up too far down the "cover all the use cases" rabbit holes, and there's not enough coverage of the kind of boring scalar workloads that most of these systems are being purchased to run.