3 ms·

I wonder if there would be difference in wall-clock time if you ran multiple instances of the hash across multiple threads, would the vectorized ones scale diff

by zokier 3y ago

I wonder if there would be difference in wall-clock time if you ran multiple instances of the hash across multiple threads, would the vectorized ones scale differently than scalar ones? With dynamic clocking and weird execution unit arrangements everything is variable

anonymoushn 3y ago
If you enable SMT then you might end up using almost all of your possible aesenc's on one of the two threads (for e.g. ahash or meowhash), so you would observe significantly less than 2x the throughput from running 2 threads on the core. If you don't enable SMT then you should get the same results that SMHasher gets. Workloads that are not mostly made of hashing probably won't suffer from this issue even with SMT enabled.